Protective coatings. Legend species of fasteners

8. Designations of the methods of processing of base metal

Method of processing Basic metal	Designation	Method of processing Basic metal	Designation
Color		Chemical polishing
Punching		Electrochemical polishing
Stroking		Electrochemical polishing
Vibercling		"Snow" etching
Diamond processing		Processing "Under Pearls"
Satin		Applying arcuate lines	dL
Matting	mT.	Applying hair lines
Mechanical polishing		Passivation

9. Designation of the methods of obtaining the coating

Method of receipt Coatings	Designation	Method of receipt Coatings	Designation
Cathodic recovery		Condensation (vacuum)
Anodic oxidation *	An.	Contact
Chemical		Contact-mechanical
		Cathode spraying
Diffusion		Ignise
Thermal spraying	According to GOST 9.304-87	Enamelly
Thermal decomposition **		Playing

The coating material consisting of metal is denoted by symbols in the form of one or two letters entering the Russian name of the corresponding metal (Table 10).

10. Designations of the coating material consisting of metal

Metal Coatings	Designation	Metal Coatings	Designation
Aluminum		Palladium

Tungsten

The coating material consisting of a alloy is denoted by the symbols of the components that are part of the alloy, separating them to the hyphen, and in brackets indicate the maximum mass fraction of the first or first and second (in the case of a three-component alloy) components in the alloy, separating them with a comma point.
Examples of the designation: coating with a copper zinc alloy with a mass fraction of copper 50-60% and zinc 40-50%

coating with a copper-tin-lead alloy with a mass fraction of copper 70-78%, Tin 10-18%, lead 4-20%

Mr. (78; 18).

11. Designations of nickel and chrome coatings

Name of coating	Designation
Name of coating	abbreviated
Nickel, obtained by brilliant from electrolyte with glitter-forming additives containing more than 0.04% sulfur
Nickel matte or semi-platter, containing less than 0.05% sulfur; Relative lengthening when testing tensile at least 8%
Nickel:

two-layer (duplex)
three-layer (triplex)		NPB. Ns. NB
two-layer composite - nickel-forces *
double-layer compositional
three-layer compositional		NPB. Ns. NZ
Chrome:

porous
microtechnical
microporous
"Dairy"
double-layer		HMOL. X. TV.

If necessary, B. specifications The drawing indicates a symbol of a chemical element or formula chemical compoundused as a coaled substance.
Note. It is allowed to apply abbreviations and indicate the total thickness of the coating.
In the designation of the coating material with an alloy (Table 12), if necessary, it is allowed to indicate the minimum and maximum mass fraction of components,
For example, a gold-nickel-nickel coating with a mass fraction of gold 93.0-95.0%, nickel 5.0-7.0%
denote ZL-N (93.0-95.0).
In the designation of coating alloys based on precious metals of hours of hours and jewelry, it is allowed to indicate the average mass fraction of components.
For newly developed alloys, the designation of the components is carried out in order to reduce their mass fraction.

12. The designations of coating alloys

Name material Coatings alloys	Designation	Name material Coatings alloys	Designation
Aluminum zinc		Gold Copper Cadmium
Gold Silver		Gold-cobalt
Gold-silver copper		Gold-Nickel Cobal
Gold-Surma		Gold-platinum
Gold-nickel		Gold-Indium
Gold-zinc nickel		Copper Tin (Bronze)
Gold-copper		Copper tin zinc (brass)
Copper zinc (brass)	M-C.	Tin lead	O-S.
Copper Lead-Tin (Bronze)	M-S-O	Tin zinc	O-C.
Nickel-Bor	N-B.	Palladium nickel	PD-N.
Nickel-tungsten	N-B.	Silver copper	SR-M.
Nickel iron	N-J.	Silver-Surma	SR-SU
Nickel Cadmium	N-KD	Silver Palladium	Cfp
Nickel Cobalt	N-k.	Cobalt-tungsten	Ko-B.
Nickel Phosphorus	N-F.	Cobalt Wolfram-Vanadium	Ko-in
Nickel Cobalt-Wolfram	N-ko-in	Cobalt-Marganese	Ko-MC.
Nickel Cobalt Phosphorus	N-ko-f	Zinc-Nickel	C-N.
Nickel Chrome Iron	N-x-w	Zinc-titanium	C-T.
Tin-bismuth	O-V.	Cadmium Titan	KD-T.
Tin Cadmium	O-KD	Chrome Vanadium	X-V.
Tin-cobalt	Eye	Chrome carbon	X-U.
Tin-nickel	IS HE	Nitride Titan	Ti-Az

In the designation of the coating material obtained by the ignition method, indicate the brand source material (pastes) in accordance with regulatory and technical documentation. In the designation of the coating of the solder, obtained by the hot way, indicate the solder brand according to GOST 21930-76, GOST 21931-76.
The designations of non-metallic inorganic coatings are shown below:

If it is necessary to indicate the electrolyte (solution), which requires the coating, use the designations given in the required applications to GOST 9.306-85.
Electrolytes (solutions) not specified in the applications denote the full name of
eg,

C9. chloroammonium. XP, M15. Pyrophosphate.

13. Designations of functional properties of coatings.

14. Designations decorative properties Coatings

* The color of the coating corresponding to the natural color of the precipitated metal (zinc, copper, chromium, gold, etc.), does not serve as the basis for attributing the coating to the painted. The color of the coating is denoted by the full name, with the exception of the black coating.

15. Designations additional processing Coatings

Additional coating treatment	Designation
Hydrophobial
Filling in water
Filling in chromate solutions
Application paint coating
Oxidation
Melting
Impregnation (varnish, glue, emulsion, etc.)
Impregnation of oil
Heat treatment
Toning
Phosphating
Chemical coloring, Including filling in the dye solution	Name of color
Chromating *
Electrochemical coloring	el. Name of color

* If necessary, designate the color of the chromate film:
Khaki - Khaki, colorless - BTSV; The color of the rainbow film is no designation.
The designation of additional coating treatment of impregnation, hydrophobization, applying the paintwork, is allowed to be replaced by the designation of the material of the material used for additional processing.
The material brand used for additional coating processing is denoted in accordance with the regulatory and technical documentation for the material.
The designation of a particular paintwork applied as an additional processing is made according to GOST 9.032-74.
Methods for preparing, coating material, electrolyte designation (solution), properties and color of the coating, additional processing not specified in the standard are denoted by technical documentation or recorded by the full name.
The procedure for the designation of the coating in the technical documentation:
designation of the method of processing base metal (if necessary);
designation of the method of obtaining coating;
Designation of coating material;
minimum coating thickness;
The designation of the electrolyte (solution), which requires a coating (if necessary) (Table 15 A; 15 b);
designation of functional or decorative properties of the coating (if necessary);
Designation of additional processing (if necessary).

In the designation of the coating, it is not necessary to have all the components listed.
If necessary, the coating designation is allowed to indicate the minimum and maximum thickness through the hyphen.
It is allowed in the designation of the coating indicate the method of obtaining, the material and thickness of the coating, while the remaining components of the conditional designation indicate the technical requirements of the drawing.
The thickness of the coating, equal to or less than 1 μm, does not indicate in the designation if there is no technical need (with the exception of precious metals).

Coatings used as technological
(for example, zinc during the cincatic treatment of aluminum and its alloys, nickel on corrosion-resistant steel, copper on copper alloys, copper on steel from cyanide electrolyte before sour copper) is allowed not to indicate.
If the coating is subjected to several types of additional processing, they are specified in the technological sequence.
Record the designation of the coating is produced in a line. All components are separated from each other points, with the exception of coating material and thickness, as well as the designation of additional treatment with paintwork, which is separated from the designation of a metal or non-metallic inorganic coating of a fraction.
Designation of the method of obtaining and material coating should be written with capital letters, other components - with lowercase.
Examples of the recording of the designation of coatings are given in Table. 16.

15a. Electrolyte notation for coating (according to GOST 9.306-85)

Main metal	Name of coating	Main components	Designation
Aluminum and its alloys		Chrome anhydride
		Oxalic acid, Salts Titan
		Boric acid, Chrome anhydride
Magnesium and its alloys		Ammonium biforide or Potassium fluoride
		Ammonium biforide, Two-volume potassium or Chrome anhydride	fluorine. chromium
		Ammonium biforide, Two-volume sodium, orthophosphoric acid	fluorine. chromium. phos

15b. Designation of solutions for coating

Main metal	Name Coatings	Main components	Designation
Magnesium and its alloys		Two-volume potassium (sodium) with different activators Two-volume potassium (sodium) with different activators, Plastic acid and potassium fluoride (sodium)	chromium. fluorine
Magnesium and its alloys		Caustic soda, potassium station, sodium acetate, Sodium pyrophosphate
Steel, cast iron		Molybdenum-oxid ammonium
	Phosphate	Barium nitrogenous, zinc monophosphate, Zinc nitric acid
	Phosphate	Barium nitric acid, orthophosphoric acid, Manganese dioxide
Magnesium and its alloys	Phosphate	Monophosphate barium, phosphoric acid, Sodium fluoride

16. Examples of recording of the designations of coatings

Coating	Designation
Zinc thickness 6 μm with colorless chromatization	C6.hr. BCV.
15 μm zinc thickness with khaki chromatization	C15. Xr.Hhaki.
9 μm zinc thickness with rainbow chromatization with subsequent application of paint and varnishes	C9. xp / LKP
Zinc thickness 6 μm, oxidized black
6 μm zinc thickness, phosphatated in a solution containing a nitric acid barium, zinc monophosphate, a nitric acid zinc, soaked in oil	C6. FOS. OX. PRM
15 μm zinc thickness, phosphatated, hydrophobic bathroom	C15. FOS. GFF
Zinc thickness 6 μm, obtained from electrolyte, in which there are no cyanny salts	C6. Neziano
3 μm cadmium thickness, with nickel underlayer with a thickness of 9 μm, followed by heat treatment, chromatized	H9. Cd3. t. Khr.
Nickel thickness of 12 microns, brilliant, obtained on a vibron-rolled surface with subsequent polishing	vBR. H12. B.
15 μm nickel thickness, brilliant, obtained from electrolyte with glossy
Chrome thickness of 0.5-1 μm, brilliant, with the stream of forces - nickel thickness of 9 μm	NSIL9. H.B.
Chrome thickness of 0.5-1 μm, with a half-liter nickel sublayer with a thickness of 12 microns, obtained on a satin surface	sN. NPB12. H.
Chrome 0.5-1 μm thick, brilliant with copper underlayer with a thickness of 24 μm and two-layer nickel 15 μm thick	M24. ND.15. H.B.
Chrome 0.5-1 μm thick, brilliant, with copper underlayer 30 μm and three-layer nickel 15 μm thick	M30. NT15. H.B.
Chrome thickness of 0.5-1 μm, brilliant with a two-layer nickel composite coating with a thickness of 18 microns
Chrome two-layer thickness of 36 μm: "Dairy" thickness of 24 μm, solid thickness of 12 microns	Xd36; Hmol24; X12. TV
Plated Tin-lead alloy with a mass fraction of 55-60% thick 3 microns deposited	0-C (60) Z.opl.
Tin-lead alloy coating with a mass fraction of a tin 35-40% thickness of 6 microns, with a nickel sublayer with a thickness of 6 microns
Tin thick 3 microns, crystalline, followed by applying paintwork
Copper thickness 6 μm, brilliant, toned a blue colour, followed by applying paintwork	MB. b. tn. Blue / LKP
The coating of the gold-nickel with a thickness of 3 microns, with a nickel sublayer with a thickness of 3 microns	NZ.Zl-N (98.5-99,5) 3
Golden thickness of 1 μm, obtained on the surface after diamond processing
Chemical nickel thickness of 9 μm, hydrophobic	Chem. H9. GFG; Chem. H9. GFG 139-41
Chemical phosphate	Chem. FOS. PRM
Chemical phosphate resulting in a solution containing a nitric acid barium, zinc monophosphate, nitric acid zinc	Chem. FOS. OX.
Chemical oxide electrically conductive	Chem. OX. E.
Chemical oxide, obtained in a solution containing caustic soda, potassium stanat, sodium acetate, sodium pyrophosphate, followed by applying paint and varnishes	Chem. OX. Stan / LKP
Chemical oxide, obtained in a solution of milk-oxidine potassium (sodium) with various activators	Chem. OX. chromium
Chemical oxide, obtained in a solution containing molybdenum-oxid ammonium impregnated with oil	Chem. OX. MDN. PRM
Anodic oxide solid, filled with chromat solutions	An. OX. TV. NHR
Anodic oxide electrical insulating with subsequent application of paint and varnishes	An. OX. EIS / LKP
Anodic oxide solid, soaked in oil	An. Oka. TV. PRM; An. OX. TV. Oil 137-02.
Anodic oxide, obtained on the stroken surface	strong An. OX.
Anodic oxide, obtained by painted in green in the process of anodic oxidation	Anotter. green
Anodian oxide, painted electro chemical method in dark gray	An. OX. El. dark grey
Anodic oxide, obtained on a chemically polished surface, painted by chemical way in red	hp. An. OX. red
Anodic oxide, obtained in an electrolyte containing chrome anhydride	An. OX. chromium
Anodic oxide, obtained in an electrolyte containing oxalic acid and titanium salt, solid	An. OX. EMT. TV
Anodic oxide, obtained on a matted surface in an electrolyte containing boric acid, chrome anhydride	mT. An. OX. EMT.
Hot coating obtained from solder pos 61	Mountains POS61.
9 microns silver thickness, with a chemical nickel coating underlayer 3 μm thick	Chem. H3. SR9.
The coating obtained by the method of chemical passivation, hydrophobized	Chem. Paz. GFJ.

State Standard of the SSR Union

one system Corrosion and aging protection

Metal coatings I.
Non-metallic inorganic

Are common requirements

Unified System of Corrosion and Ageing Protection.
Metal and Non-Metal Inorganic Coatings.
General Requirements.

GOST
9.301-86

( ArtSEV 5293-85,
ArtSEV 5294-85
ArtSEV 5295-85,
ArtSEV 6442-88
ArtSEV 6443-88,
ArtSEV 4662-84
ArtSEV 4664-84,
ArtSEV 4665-84
ArtSEV 4816-84)

Date of administration 01.07.87

Content

This standard applies to metal and non-metallalloneurganic coatings (hereinafter referred to as coatings) obtained by electrochemical, chemical and hot (tin and its alloys) in methods, and establishes general requirements (hereinafter referred to as the requirements) to the surface of the base metal and coatings in the process of their production and quality control of the base metal and coatings.

The standard does not apply to coatings used as technological sublayers, on nickel, nickel-chromium, copper-nickel and copper-nickel-chromium, having only decorative purposes, and does not take into account the changes in the coatings that appeared during the assembly and testing of the product.

The requirements not provided for in this standard related to the specifics of the details, production and requirements for coatings indicate the regulatory and (or) design documentation.

Compliance with the requirements of this standard are monitored by methods according to GOST 9.302 -79.

(Modified edition, change No. 2).

1. Requirements for the surface of the base metal

1.1. The surface roughness of the main metal according to GOST 2789-73, MKM, should not be more:

R. a 10 ( RZ. 40) - under protective coatings;

R. a 2.5 ( RZ. 10) - under protective and decorative coatings;

R. a 1.25 ( RZ. 6.3) - under solid and electrical insulating anodogoxic coatings.

The surface roughness of the base metal for functional coatings must be complied with the normative and (or) design documentation on the product.

These surface roughness requirements do not apply to non-working internal surfaces for processing and non-working inner surfaces of parts, threaded surfaces, cutting surfaces of stamped parts with a thickness of up to 4 mm, corrugated surfaces, and on parts, the roughness of the main metal of which is established by the relevant standards. The need to bring the roughness of surfaces to the established values \u200b\u200bshould be specified in the design documentation.

1.2. Sharp corners and the edges of the parts, with the exception of technically reasonable cases, must be rounded by a radius of at least 0.3 mm; Radius of the roundabout of parts for solid and electrical insulating anode-oxidic coatings of at least 0.5 mm.

1.3. On the surface of the parts are not allowed:

radish Okalo, burrs;

bundles and cracks, including emerging after etching, polishing, grinding;

corrosion damage, pores and sinks.

(Modified edition, change No. 1).

1.4. The surface of the cast and forged parts should be without gas and shrinkage shells, slag and flux inclusions, spa, non-breaking, cracks.

Allowed deviations on the surface of cast parts (species, size and quantity) are installed in the regulatory and technical and design documentation.

1.5. The surface of parts made of hot-rolled metal should be cleaned from scale, buttermillers, corrosion products of base metal and other contaminants.

1.6. The surface of parts after machining should be without a visible layer of lubrication or emulsion, metal chips, burrs, dust and corrosion products without the introduction of foreign material particles.

1.5, 1.6.

1.7. The surface of the parts after abrasive processing, for example, hydropuscore, tanting, etc. should be without a polar sludge, slag, corrosion products and burrs.

1.8. The surface of polished and polished parts should be homogeneous, without care, dents, aids, rice, burrs, defects from a straight tool.

1.9. On the surface of parts after heat treatment (annealing, quenching, normalization, vacation, aging, as well as heat treatment, it is carried out to improve the adheses of subsequent coatings) should not be needed, scratches, cracks, bubbles, corrosion foci, bundles, storage.

1.10. Welded and soldering seams on details should be cleaned, continuous throughout the perimeter to eliminate the gaps and the electrolyte penetration.

Defects that appeared when scrolling the seams performed by medium-slim solders should be eliminated by subfalio the same or low-wave solders.

On the surface of the soldered seams is allowed uniform spreading of a width to 10 mm wide, separate non-separation pores, purified from flux residues and non-violate soldered seams.

The seams on the details of titanium alloys must be performed by methods that exclude oxidation.

Mechanical stripping of seams on the details made by soldering in the melt of salts are not allowed. Soldering seams on such details should be smooth and dense. On the surface of the details there should be no remnants of fluxes and splash silumin.

The adhesive seams on the details must be solid, without blinking, bubbles and voids, not hazard, in which the electrolyte can penetrate, do not contain excess glue in the nearby zone and stripped mechanical method.

It is not allowed to apply chemical and electrochemical coatings on parts having adhesive connections.

1.11. The surface of the electrical parts should be smooth, light and shiny without stretching, aids, cracks, incredible salts, corrosion products.

The degree of brilliance is not normalized.

On the electrolysed surface are not brave the following signs:

uneven glitter in areas having different thermal and mechanical processing;

separate matte and whiten areas on the surface of the parts to which decorative requirements do not impose;

lack of electropolishing effect in hard-to-reach places: slots, gaps, deaf holes with a diameter of up to 15 mm, through - up to 10 mm, as well as holes and recesses, hard to reach for electropolishing;

traces of water flows;

lack of brilliance in welding places;

traces of contact with the device in the form of matte and dark plots;

mechanical polishing (if necessary) contact places with a device and to obtain accurate parts of the part after electropolishing;

black dots on the thread, if there are no other instructions in the regulatory and technical documentation;

traces of mechanical processing of the base metal before electropolishing and other deviations allowed by the regulatory and technical documentation for the main metal.

1.9-1.11. (Modified edition, change No. 1).

2. Requirements for coatings

2. 1. Requirements for the appearance of the coverage

2.1.1. The surface of the polished coating should be uniform, shiny or mirror.

On the mechanically polished surface of the coating, except for the mirror, are not branded signs of single hair-like scratches or points from polishing pastes and a rattling tool in an amount of no more than 5 pcs. At 100 cm 2, filling the edges, minor waviness (pulp) coating on the details of brass, if there are no special requirements in the design documentation.

2.1.2. On the surface of the coating, if there are no special instructions in the design documentation, the following signs are not broken:

traces of machining and other deviations allowed by the regulatory and technical documentation for the main metal;

minor waviness of the surface of the coating after an exhaust detectable after etching;

dark or light strips or stains in hard-to-reach holes and grooves, on the inner surfaces and concave parts of parts of the complex configuration, places of conjugation of all-in-block assembly units, in welded, soldered seams, near the places and places for removing the plating layer;

non-uniformity of glitter and ambiguity of color;

the ambiguity of the color of coatings on the details of plated metals with partial machining;

traces of water flows, chromatizing and phosphating solutions without salting residues;

shiny points and strokes formed from contact with measuring instrument, devices and from the colliding of parts in the process of applying coatings in the drums, bells and mesh devices;

change in color intensity or darkening after heating in order to inform and check the adhesion strength, removal of insulation and impregnation;

single black dots on areas designed to fill compounds, sealants, adhesives;

no coverage:

in the pores, places of inclusions allowed by regulatory and technical documentation for casting;

on the welded and soldering seams and about them at a distance of no more than 2 mm on the other side of the seam and in inner corners mutually perpendicular planes, subject to subsequent additional protection of these places;

in contact places, the part with the device, except for special cases specified in the design documentation.

2.1.3. When the parts are precipitated on the surface of the part of two coatings without insulation or using isolation, as well as during the deposition of local coatings, if this does not affect the performance of the product, are not brave following signs:

displacement of coating boundaries up to 2 mm, and for gold coatings, palladium, rhodium and their alloys up to 1 mm in one direction or the other;

separate point inclusions of one coating on the surface of the other; Spot turning on the metal coating on the insulated surface;

metal darkening at the boundary of coatings;

the colors of running on unscrewed surfaces.

2.1.2, 2.1.3. (Modified edition, change No. 1).

2.2. Coverage thickness requirements

2.2.1. Excess of the maximum coating thickness is not a brave sign, if this does not affect the assembly and performance of the product.

(Modified edition, meas. No. 1).

2.2.2. In holes, grooves, cutouts, on concave parts of complexized parts, on the inner surfaces and places of conjugation of all-point assembly units is allowed to reduce the thickness of the coating to 50%, and for chrome coatings - no if there are no other requirements in the design documentation for the coating thickness on the specified areas .

2.2.3. In deaf smooth and threaded holes and grooves with a diameter (or width) to 12 mm and in through smooth and threaded holes and grooves with a diameter (or width) to 6 mm, the thickness of the coating at a depth of more than one diameter (or one width) is not rationed; An absence of a coating is allowed if the requirements for the coating thickness in these areas are not specified in the design documentation.

2.3. The coating should be firmly linked with the main metal.

2.4. In appearance, thickness and other indicators, the coating must comply with the requirements of Table. 1 -19.

(Modified edition, change No. 1, 2).

2.5. Storage and transportation conditions of parts should exclude mechanical and chemical impacts resulting in damage to the coating.

Table 1

Zinc and cadmium coating. Chromate coatings on zinc and cadmium coatings. Phosphate coating on zinc coating

Name of the indicator	Requirements for coating
Appearance	Color zinc coating light gray or silver gray with a bluish tint.
	Cadmium coating color light gray or silver gray
	Color zinc coating with colorless chromating silver-gray or silver gray with a bluish tint. Multiple rainbow shades are allowed.
	The color of the zinc coating with rainbow chromating of green-yellow with rainbow shades.
	Cadmium coating color with rainbow chromating golden yellow with rainbow shades.
	Cynch coating color with khaki chromating with various shades.
	Cadmium coating color with khaki chromating from khaki to brown.
	Color zinc coating with black chromating black or black with green tint. Gray and rainbow shades are allowed on concave parts of details of the complex configuration.

	matte surface after preparation of the surface of the hydropuscore and metal-plated cleaning, tangling, etching;
	damage or weakening the intensity of the color of the chromate coating on the details after heat treatment;
	the darker or brightest shade of the chromate coating in the holes and grooves, on the inner surfaces and the concave parts of the details of the complex configuration, places of conjugation of all-point assembly units, sharp edges, corners, contact places with a device, between the springs with a small step;
	matte stripes around holes;
	single mechanical damage to chromate coating no more than 2%. common Square.
	Color zinc coating with phosphating from light gray to dark gray. Not a brave sign is insignificant white flag in deaf holes, grooves, etc. The phosphate coating on the zinc coating should be uniform and dense.
	On the surface are not allowed:
	slag deposition;
	uncoated stripes or stains; scratches that reach the main metal; corrosion foci; pollution from oils, lubricants or surfactants - for coatings intended for applying paints and varnishes. "
Thickness for zinc and cadmium coatings
The mass of the coating per unit area of \u200b\u200bthe surface	Colorless chromat coating - up to 0.5 g / m 2.
	Rainbow chromat coating - up to 1.0 g / m 2.
	Khaki colors Chromate coating - over 1.5 g / m 2.
	The phosphate coating intended for impregnation is at least 5.0 g / m 2.
	The coating intended for the paintwork - in accordance with the requirements of GOST 9.402-80
Structure	The phosphate coating intended for paintwork should have a microcrystalline structure
Protective properties	When tested chromate coatings with a solution of acetic acid, a solid dark spot should not appear before the expiration of the set time. When testing phosphate coating, the color of the test solution drops should not be changed to black for a set time.
Fullness washing	The electrical conductivity of the water after washing the phosphate coating intended for the paint coating should not exceed the three-time value of its source value
Oilness	The oil complex of phosphate coating is not less than 2.0 g / m 2

table 2

Copper coating and coating with copper alloys

Name of the indicator	Requirements for coating
Appearance	Copper coating color from light pink to dark red. The shade is not normalized.
	The color of the high-headed coating with a copper-tin alloy from light gray to gray. The shade is not normalized.
	The color of low-headed coating with alloy copper tin light yellow. The shade is not normalized.
	The color of the coating with alloy copper zinc from light yellow to light pink.
	On the coating are not branded signs of coloring, copper sprouts on the coating obtained in order to protect against cementation, darkening of the coating during storage to assembly
Thickness	In accordance with the requirements of the design documentation
Chemical composition	Mass fraction of copper in coatings alloys:
	Mr. (60) - from 50 to 60%;
	Mr. (88) - from 70 to 88%;
	M-c (90) - from 70 to 90%;
	M-C (70) - from 55 to 70%
Porosity	Coatings designed to protect against cementation should not have
Functional properties

Table 3.

Nickel coat

Name of the indicator	Requirements for coating
Appearance	The color of the matte nickel coating light gray with a yellow tinge, a brilliant nickel coating light gray. Dark color is allowed in the holes and grooves on the inner surfaces, concave parts of the details of the complex configuration and the places of conjugation of assembly units.
	The color of the chemical nickel coating gray with a yellow tint.
	Damage and rainbow tones are not branded signs after heat treatment, matte spots due to the uneven etching of the base metal. The color of black and thermally oxidized coating from black and gray to black. Colors of closures are allowed
Thickness	In accordance with the requirements of the design documentation.
	The thickness of the black nickel coating is not normalized.
	The thickness of the lower layer of the nickel three-layer coating of ND (NPB.NB) with respect to the total thickness of the coating 50-70%; The thickness of the upper layer is 50-30%.
	The thickness of the lower layer of the nickel three-layer coating of NT (NPB.NS.NB) with respect to the total thickness of the coating 50% or more; The middle layer is up to 10%, upper - up to 40%.
Chemical composition	Mass fraction of sulfur in the lower layer of nickel two-layer coating of ND (NPB.NB) to 0.005%; In the upper 0.05-0.09%.
	Mass fraction of sulfur in the lower layer of nickel three-layer coating of NT (NPB.NS.NB) to 0.005%; on average - not less than 0.15%; In the upper - 0.05-0.09%.
	Mass fraction of phosphorus in chemical nickel coating 3-12%
Porosity*	Not more than three through pores per 1 cm 2 surface area and 1 cm of the length of the edge. With a thickness of the coating of less than 24 μm or nickel thickness with a sublayer of less than 12 microns is not normalized
Functional properties	In accordance with the requirements of the design and (or) regulatory and technical documentation for the product
Protective properties	Also

Table 4.

Chrome coating

Name of the indicator	Requirements for coating
Appearance	The color of a brilliant coating light gray with a bluish tint.
	Matte coating color light gray.
	The color of solid (wear-resistant) coating light gray with a bluish or milky-matte.
	The color of the two-layer (corrosion-wear-resistant) coating light gray.
	The color of microporous and microcrack coatings from light gray to gray with a blue tint. The color of a microporous shiny coating obtained from electrolytes with trivalent chromium, from light gray to dark gray.
	Color of milk coating light gray.
	It is not brave signs of single point recesses up to 2% of the total area with a chromium thickness of more than 40 microns and a grid of cracks with a chromium thickness of more than24 microns. Black coating black with blue or brown tint.
	It is not a brave sign of a gray shade in inner corners, deepening and holes of complex details
Thickness	In accordance with the requirements of the design documentation
Porosity	No more than three through pores of 1 cm 2 surface area and 1 cm of the edge length, if there are no other instructions in the design documentation *.
	The porosity of the dairy chromium with a thickness of less than 24 microns, a protective-decorative two-layer thickness of less than 21 microns and a wear-resistant thickness of less than 40 microns is not normalized *.
	The number of pores on the surface of the microporous coating (H. MP) when evaluating using optical microscopes with an increase of at least 100 × should be at least 10,000 per cm 2.
	The porosity of black chromium is not normalized.
	At the surface of the chromium microcrack coating (x Mt) there should be at least 250 cracks at a length of 1 cm in all directions forming the grid of cracks
Functional properties	In accordance with the requirements of the design and (or) regulatory and technical documentation for the product
Functional properties	Coating hardness - according to GOST 9.303-84
Protective properties	Also
	When testing phosphate coating, the color of the test solution drops should not be changed to black for a set time.

* Requirements are presented to coating on steel details.

(Amendment. IUS 1-1991)

Table 5.

Tin coating and coating alloys of tin

Name of the indicator	Requirements for coating
Appearance	The color of melted and unknown coatings from light gray to gray. The melted coating is brilliant. It is allowed to uneven glitter on one piece.
	The color of the coating alloy tin-nickel light gray. Pink and purple shades are allowed.
	Color coating with tin-lead alloy from light gray to dark gray. The shade is not normalized.
	Color coating tin-bismuth from light gray to gray.
	Are not a brave sign of metal influx, which do not interfere with the assembly and not affecting the functional properties of the coating
Thickness
Chemical composition	Tin coatings intended for use in contact with food productsmust contain no more than 0.1% lead and no more than 0.025% of arsenic
	Mass fraction of tin in coatings alloys:
	O-H (65) is 50 to 70%;
	O-C (60) - T 50 to 70%;
	O-C (40) is 30 to 50%;
	O-C (12) is 8 to 15%.
	Mass fraction of bismuth in the coating of the O-WP alloy (99.8) from 0.2 to 4.0%
Porosity*	No more than three through pores per 1 cm 2 surface area and 1 cm of the edge length, if there are no other instructions in the design documentation.
Porosity*	With a thickness of the coating of 6 μm and less not normalized
Functional properties
Protective properties	Also

* Requirements are presented to coating on steel details.

Table 6.

Hot Tin Covers and Tin Lead Alloy

Name of the indicator	Requirements for coating
Appearance	The color of the tin coating from light gray to gray, the color of the coating with a tin-lead alloy from gray to dark gray. Coating brilliant or matte, smooth. The degree of brilliance is not normalized.

	minor slips and non-uniformity of the thickness of the coating that do not interfere with the soldering or work of the part;
	four-stranded splashes and metal drops that do not interfere with the work of the part, on non-working and working (sample) surfaces, as well as on surfaces on which coating is not provided, except for the sliding surfaces;
	dark spots on the coating on the inner surfaces of the deaf holes;
	minor jourver over the entire length of the wire and the deepening from the contact of the wire with the guide roller, not reaching the base metal;
	the ambulance color of the coating.
	Not allowed:
	rough influx;
	dark spots, points, unstained White Film or brown color;
	cracks, delays, non-flipped areas;
	solder splashes on working surfaces with precious metals (gold, silver, palladium, etc.);
	the remains of acid fluxes
Thickness	Not normalized
Chemical composition	The chemical composition of tin-lead alloy coatings must correspond to a chemical composition according to the main components of soldiers according to GOST 21930-76 and GOST 21931-76
Functional properties	In accordance with the requirements of the design and (or) regulatory and technical documentation for the product

Table 7.

Silver coating and silver-antimony alloy

Name of the indicator	Requirements for coating
Appearance	The color of silver coating and coating with a silver-antimony alloy scattered white.
	The color of silver coating from electrolytes with glossy-forming additives and silver chromated coating white with a yellowish tint.
	The color of the silver coating obtained by a chemical way, white.
	The color of the black silver coating from the dark gray daughter.
	The following signs are not broken:
	dark spots, stripes and colors of dealt with deaf holes, grooves, on concave parts of parts of a complex configuration;
	damage to the coating during storage to the assembly and a change in color from light pink to light brown after heat treatment, pressing in plastics, subject to the maintenance of functional properties
Thickness	In accordance with the requirements of the design documentation
Chemical composition	Mass fraction of antimony in the coating with a alloy of CP-SU from 0.4 to 2%
Porosity
Functional properties	In accordance with the requirements of the design and (or) regulatory and technical documentation for the product

Table 8.

Golden coating and coating alloys of gold

Name of the indicator	Requirements for coating
Appearance	Color of gold coating from light yellow to dark yellow
	Color coating with gold-nickel alloy from light yellow to yellow.
	Color coating alloy gold-cobalt from orange yellow to yellow
Thickness	In accordance with the requirements of the design documentation
Chemical composition	Mass fraction of stroke nickel alloy and mass fraction of cobalt in the coating with an ESL-Co. alloy - in accordance with the requirements of GOST 9.303-84
Functional properties	In accordance with the requirements of the design and (or) regulatory and technical documentation for the product

Table 9.

Palladium coating

Name of the indicator	Requirements for coating
Appearance	Color coating from light gray to gray with yellow tint.
Appearance	Are not a brave sign of single dark spots, rainbow shades from light brown to violet, resulting in heating, subject to the maintenance of functional properties
Thickness	In accordance with the requirements of the design documentation
Functional properties	In accordance with the requirements of the design and (or) regulatory and technical documentation for the product

Table 10.

Rhodium coat

Name of the indicator	Requirements for coating
Appearance	Color coating light gray with blue tint
Thickness	In accordance with the requirements of the design documentation
Functional properties	In accordance with the requirements of design and (or) regulatory and technical documentation for the product.

Table 11.

Chemical oxide coating on steel and cast iron

Name of the indicator	Requirements for coating
Appearance	Chim coating color. OX (including after impregnating oil) on parts of carbon and low-alloyed steels black with a blue tint. On the details obtained by the casting method, the black color of the coating with gray or brown shades is allowed.
	The color of the coating on the details of high-alloy steels from dark gray to dark brown with a cherry tint.
	The color of the coating on the details of cast iron and steels doped with silicon, from light yellow to dark brown.
	Color coating on details of high carbon tool steels black with gray tint
	The ambulance and shade on the details that have passed the local hardening, welding, cementation, slope and other mechanical processing are allowed; Red shade of coatings on small profiled parts and between the springs with a small step, light gray - on the sharp edges of the details
Thickness	Not normalized
Protective properties	On the coating of the chemical source after testing during the set time there should be no stains of contact with the stuffed copper.
Protective properties	On the coating of chemical ox. PRM after testing should not be foci of corrosion, with the exception of sharp edges and springs, on which no more than three corrosion points are allowed to 1 cm 2 surface area and 1 cm edge length

Table 12.

The coating obtained by the method of chemical passivation
on corrosion-resistant steadies.

Name of the indicator	Requirements for coating
Appearance	Color coating chemicalpace. Must correspond to the color of the metal being processed.
	The following signs are not broken:
	rainbow shades, depending on the steel grade, including in places of welding, bend;
	minor darkening;
	traces of mechanical finishing;
	black inclusions in the form of separate small points
Thickness

Table 13.

Chemical oxide and anodian oxide coating on copper and its alloys

Name of the indicator	Requirements for coating
Appearance	Color coating chemical ox and en. Soks from a dark red with a brown tinge to black with a blue tint

	traces of mechanical finishing of the surface of the base metal;
	partial absence of coating on sharp edges;
	damage between springs springs with a small step.
	The color of the coating of the chemicalpace must correspond to the color of the metal being processed.
	The following signs are not broken:
	rainbow shades;
	damage to the coating between the springs with a small step;
	the indifference of the lacquer film in color and dripping lacquer after varnishing, which do not interfere with the assembly and not affecting the performance of the product
Thickness	Not normalized
Protective properties	When testing on the coating of chemicalpass, there should be no change in the color of the drop to the blue until the set time expires

Table 14.

Chemical oxide coating on aluminum and its alloys

Name of the indicator	Requirements for coating
Appearance	Color coating chemical ox from gray-blue to dark blue or salad-blue to green or yellow
	on alloy brands D16, D1, D24F - greenish blue with rainbow shades or without them;
	on foundry alloys - gray-blue with black and brown divorces.
	The color of the coating of chemicalpace corresponds to the color of the base metal.
	Color coating chemical ox.E from colorless to light blue or light yellow; from golden yellow to brown with rainbow shades on deformable alloys; Gray with yellow and brown divorces on casting alloys.
	The following signs are not broken:
	dark and bright stripes in the rolling direction, soldering and welding places;
	damage on the details, soldered high temperature soldering;
	separate spots from chrome salts around the holes, in places of contact of parts with a device, places of pairing of all-in-block assembly units, around the pores and places of inclusions allowed by the regulatory and technical documentation for casting;
	identification of the structure of the main metal
Thickness	Not normalized
Protective properties
Functional properties	In accordance with the requirements of the design and (or) regulatory and technical documentation for the product

Table 15.

Anodic oxide coating on aluminum and its alloys

Name of the indicator	Requirements for coating
Appearance	The color of the coating an.oks from light gray to dark gray, on the details of the casting alloys from light gray to dark brown. The shade is not normalized.
	The color of the painted coating should correspond to the color of the sample. The shade is not normalized. On multicomponent and casting alloys, glare of various tones are possible.
	Color coating An.oks.Hrom from milk to gray, rainbow shades are possible.
	The color of the coating an.x.nhr from light green to yellow-green, on multicomponent and casting alloys from gray to dark gray. The shade is not normalized.
	The following signs are not broken:
	dark and stains as a result of the detection of heterogeneity of the structure of the base metal;
	dark and light stripes in the direction of rolling, places of welding, ticking, latch, places of lack of a plating layer;
	yellow spots from chrome salts around the holes, in the grounds of contact details with a device, in places of conjugation of all-in-block assembly units, around the pores and places of inclusions allowed by the regulatory and technical documentation for casting.
	Color coating An.x.TV from light gray to black, yellow-green shades are allowed.
	The color of the coating an.ox. Eases from light yellow to dark brown or from light gray to dark gray.
	Color coating An.x.TV and An.x.EZ after filling with chromates from yellow-green to brown-black.
	It is not a brave sign on the coverage of an ant. Ease of microcracks, if they do not affect the functional properties.
	Color coating An.oks.EMT from light gray to dark gray, depending on the alloy used, enhaid. The shade is not normalized.
	The color of the painted coating must match the color of the sample
	Color coating anotter light brown, gray-blue, blue-black, golden, golden-bronze, bronze, gray brown.
	It is allowed a lighter tone on the inner surfaces of the details.
Thickness	In accordance with the requirements of the design documentation
Quality of filling coating	After testing loss of the sample, the sample should not exceed 20 mg / dm 2 for products intended for operation in an open atmosphere, and 30 mg / dm 2 for products intended for use in a closed room.
Quality of filling coating	After testing, the coating should not be stained or can be painted slightly!
Fullness washing	The electrical conductivity of the water after washing the coating of An.oks.EIZ should not exceed the three-time value of its initial value
Protective properties	When testing should not be observed a change in the color of the test solution drops until the set time expires.
Functional properties	In accordance with the requirements of the design and (or) regulatory and technical documentation for the product

Table 16.

Anodian oxide coating on titanium alloys

Name of the indicator	Requirements for coating
Appearance	Color coating anotter from blue to blue, pink, green, yellow. The shade is not normalized.
	Are not a brave sign traces of mechanical finishing of the main metal surface
	Color coating An.oks from light gray to dark gray
Thickness	Not normalized
Functional properties	In accordance with the boards of design and (or) regulatory and technical documentation for the product

Table 17.

Chemical oxide and anodian oxide coating
on magnesium and magnesium alloy

Name of the indicator	Requirements for coating
Appearance	Color coating chemical ox from straw yellow to dark brown or black.
	Color coating chemical phos from light gray to dark gray.
	Color coating anotter yellow, green or gray-black. The shade is not normalized.
	The following signs are not broken:
	colors of rugs; stains formed during re-oxidation; Point plots of metal without coating around me; Gray stains with a mosgeing flaw on ML-5 alloy;
	black spots on mechanically processed surfaces, which are a consequence of local metal heating viscore processing
Thickness	Cover thickness Him. Soks is not normalized, An.oks - in accordance with the requirements of the design documentation

Table 18.

Phosphate coating on steel and cast iron

Nameindicator	Requirements of kpocrytia
Appearance	The color of the coating from light gray to black, after impregnation with oil, emulsion or after hydrophobication from dark gray to black.
	The following signs are not broken:
	the heterogeneity of the crystal sizes in the areas of local quenching, welding, stagnation, various surface roughness on the decarbered areas;
	white plaque removed by wiping;
	flaw of phosphate sludge on non-working surfaces;
	traces of the copper electrode on parts welded with point or roller welding;
	stains, divorces and floors after wiping emulsion, varnish or after hydrophobic, which do not interfere with the assembly and not affecting the performance of the product;
	yellow spots from chrome salts around holes, contact places Parts with adaptation and places of conjugation of assembly units, stains around the pores and places of inclusion, allowed by regulatory technical documentation for casting
The mass of the coating per unit area of \u200b\u200bthe surface	The mass of coating per unit of surface area before impregnation is at least 5 g / m 2; on surface with roughnessR. a. 1.25-0.63 μm is allowed to reduce the mass of the coating per unit area of \u200b\u200bthe surface in accordance with the requirements of the regulatory and technical documentation.
	The mass of the coating on the unit of the surface area before applying the paint coating in accordance with the requirements of GOST 9.402-80
Structure	The coating intended for the paintwork should have a microcrystalline structure.
Protective properties	When testing according to GOST 9.302-88, the color of the drops during the set time is not to change or after testing on the coating there should be no foci of corrosion, with the exception of sharp edges, pairing sites of all-point assembly units, where no more than three point corrosion foci is allowed to 1 cm 2 Surface area and 1 cm edge length
Oilness	Not less than 2.0 g / m 2
Fullness washing	The electrical conductivity of water after washing the coating intended for the paintwork should not exceed the three-time value of its original value.

Table 19.

Chemical oxide chromatic and phosphate coating on zinc alloys

Name of the indicator	Requirements for coating
Appearance	Color coating chemical ox. chrome greenish-yellow with rainbow shades; If there are copper objects, the color of the coating gray blue; Color coating chemical phos from light gray to gray.
	The following signs are not broken:
	matte surface and weakening of the intensity of the color of the chromate coating on the details after heat treatment, hydroplast cleaning, tanting andetching;
	the darker or brightest shade of a chromate coating in the holes and grooves, on the inner surfaces and on the concave parts of the details of the complex configuration, on the places of pairing of all-in-block assembly units, on sharp edges, corners, in contact places with a device, between the springs with a small step;
	matte stripes near holes
	single mechanical damage to chromate coating no more than 2%
Thickness	Not normalized

3. Requirements for the quality control of the main metal and coatings

3.1. Before applying coatings, 2-5% of parts from the party, but at least three parts, and for details of single production - each part is controlled for compliance with PP. 1.1 -1.10.

3.2. Semi-finished products (ribbon, wire, etc.) are subjected to input control for compliance with the requirements of regulatory and technical documentation for the supply and requirements of PP. 1.1-1.6.

In the presence of unsatisfactory results, repeated control on the double number of parts.

Upon receipt of unsatisfactory results of re-control, at least one piece is marked and returned by the manufacturer.

3.3. If it is impossible to control the quality of coatings on details, for example, large and heavy, details of a single production, it is allowed to monitor samples of witnesses or guarantee the quality of the coverage with the correct implementation of the technological process confirmed by the record in the process of controlling the technological process.

Samples witnesses should be made of material from the material, to have the same surface roughness and coating applied by the same technology on which coatings are applied on the details.

The form and sizes of witness samples are developed by the enterprise and are coordinated in the prescribed manner.

The same tests of witnesses and details can be used for various control tests.

3.4. The parts on which the coating control was carried out by destroying methods, as well as parts, coatings of which do not comply with the requirements of this standard, are allowed to make an acceptance after re-applying coating.

3.5. Control of the appearance of coatings is carried out by 100% of the details.

It is allowed to apply statistical control methods forGOST 18242-72.

Control of the appearance of the coating on the details covered by the bulk and in the automatic lines is allowed to be carried out on a sample of 2% of parts from each batch.

3.6. Control of the thickness of the coating is carried out before its additional processing, with the exception of crashing, polishing, grinding, chromatation and phosphating.

Control of the thickness of the nickel coating, including the chemical method obtained, is carried out to heat treatment.

3.4-3.6. (Modified edition, change No. 1).

3.7. 3.8. (Excluded, change No. 1).

3.9. To control the thickness of the coating, clutch strength and other quality indicators from each batch, select from 0.1 to 1% of the parts, but at least three parts.

In technical cases, for example, for products of small-scale manufacture or coatings with precious and rare metals and their alloys, it is allowed to set a sample of less than 0.1%, but at least three parts.

Control of the thickness of the coating with a metallographic method is allowed to be carried out on one part.

Control of the thickness of the coating on the details processed in the automatic lines is allowed to be carried out at least once in shift.

3.10. The adhesion strength of coatings subjected to heat treatment, melting, crashing, grinding and polishing is evaluated after these operations.

3.9, 3.10. (Modified edition, change No. 1).

3.11. The control chemical composition The coatings of alloys are carried out at least twice a week, as well as after adjusting the electrolyte.

The phosphorus content in the chemical nickel coating and sulfur in the protective-decorative nickel coating is allowed not to control, but guarantee the correctness of the technological process.

3.12. (Excluded, change No. 1).

3.13. The control protective properties coatings obtained by Him methods. Pass, en. Oka and chemical. OX for copper and its alloys intended for operation in conditions 1GOST 15150-69As well as indicated coatings, additionally protected by paintwork, do not conduct.

Control of protective properties of chemical coatings. OX and Chem. FOS on steel and cast iron is allowed to carry out before or after their additional processing.

3.14. The need to control the mass of the coating per unit of surface area, oil complexes, completeness of washing, porosity, quality of filling coatings, protective properties of chromate coatings on zinc and cadmium coatings, phosphate coatings on zinc coatings and structures are set in the regulatory and (or) design documentation.

3.13, 3.14. (Modified edition, change No. 1).

3.15. Upon receipt of unsatisfactory results, one of the indicators during selective control of coatings, repeated controls on the twin amount of parts in the sample.

With unsatisfactory results, during re-control of coatings on one part, the entire batch is married or in case of inconsistency in appearance is subjected to continuous control.

Re-control of the adhesion strength of coatings are not conducted. In case of receipt of unsatisfactory results, when selecting controls, the entire batch is braided.

(Introduced additionally, meas. No. 1).

Information details

1. Performers

I.L. Moteunas , Cand. Chem. sciences; V.V. Protested; D.G. Kovalenko; G.V. Kozlov , Cand. tehn Sciences (the heads of the topic); N.G. Alberg; T.I. Berezhnyak; G.S. Fomin , Cand. Chem. sciences; E.B. Davidavicus , Cand. Chem. Science ; S.Z. Navitkene; B.A. Arlaskene

2. APPROVED AND INTRODUCED RESOLUTION State Committee USSR on standards from 27.02.86 No. 424

3. Performance check 5 years

4. The standard corresponds to ST SEV 4662-84, ST SEV 4664-84, ST SEV 4665-84, ST SEV 4816-84, ST SES 5293-85, ST SEV 5295-85, ST SES 5295-85, ST SEV 6442- 88, ST SEV 6443-88 in terms of technical requirements

Standard corresponds to ISO 1456-88, ISO 1458-88, ISO 2081-86, ISO 2082-86, ISO 2093-86, ISO 6158-84, ISO 7599-83

5. In return GOST 9.301-78

6. References Regulatory Technical Documents

7. Reprint with amendments No. 1, 2, approved in March 1989, October 1989 (IUS 6-89, 1-90)

State Standard of the SSR Union

Unified corrosion and aging protection system

Metal coatings I.
Non-metallic inorganic

Are common requirements

Unified System of Corrosion and Ageing Protection.
Metal and Non-Metal Inorganic Coatings.
General Requirements.

GOST
9.301-86

( ArtSEV 5293-85,
ArtSEV 5294-85
ArtSEV 5295-85,
ArtSEV 6442-88
ArtSEV 6443-88,
ArtSEV 4662-84
ArtSEV 4664-84,
ArtSEV 4665-84
ArtSEV 4816-84)

Date of administration 01.07.87

Content

This standard applies to metal and non-metallalloneurganic coatings (hereinafter referred to as coatings) obtained by electrochemical, chemical and hot (tin and its alloys) by methods, and establishes general requirements (hereinafter referred to as the requirements) to the surface of the main metal and coatings in the process of their production and quality control. Basic metal and coatings.

The requirements not provided for in this standard related to the specifics of the details, production and requirements for coatings indicate the regulatory and (or) design documentation.

Compliance with the requirements of this standard are monitored by methods according to GOST 9.302 -79.

(Modified edition, change No. 2).

1. Requirements for the surface of the base metal

1.1. The surface roughness of the main metal according to GOST 2789-73, MKM, should not be more:

R. a 10 ( RZ. 40) - under protective coatings;

R. a 2.5 ( RZ. 10) - under protective and decorative coatings;

R. a 1.25 ( RZ. 6.3) - under solid and electrical insulating anodogoxic coatings.

The surface roughness of the base metal for functional coatings must be complied with the normative and (or) design documentation on the product.

1.2. Sharp corners and edges of parts, with the exception of technically reasonable cases, must be rounded by a radius of at least 0.3 mm; Radius of the roundabout of parts for solid and electrical insulating anode-oxidic coatings of at least 0.5 mm.

1.3. On the surface of the parts are not allowed:

radish Okalo, burrs;

bundles and cracks, including emerging after etching, polishing, grinding;

corrosion damage, pores and sinks.

(Modified edition, change No. 1).

1.4. The surface of the cast and forged parts should be without gas and shrinkage shells, slag and flux inclusions, spa, non-breaking, cracks.

Allowed deviations on the surface of cast parts (species, size and quantity) are installed in the regulatory and technical and design documentation.

1.5. The surface of parts made of hot-rolled metal should be cleaned from scale, buttermillers, corrosion products of base metal and other contaminants.

1.5, 1.6.

1.7. The surface of the parts after abrasive processing, for example, hydropuscore, tanting, etc. should be without a polar sludge, slag, corrosion products and burrs.

1.8. The surface of polished and polished parts should be homogeneous, without care, dents, aids, rice, burrs, defects from a straight tool.

1.10. Welded and soldering seams on details should be cleaned, continuous throughout the perimeter to eliminate the gaps and the electrolyte penetration.

Defects that appeared when scrolling the seams performed by medium-slim solders should be eliminated by subfalio the same or low-wave solders.

On the surface of the soldered seams is allowed uniform spreading of a width to 10 mm wide, separate non-separation pores, purified from flux residues and non-violate soldered seams.

The seams on the details of titanium alloys must be performed by methods that exclude oxidation.

The adhesive seams on the details should be solid, without blinking, bubbles and voids, do not have gaps in which the electrolyte can penetrate, do not contain excess glue in the near-the-sized zone and are mechanically stripped.

It is not allowed to apply chemical and electrochemical coatings on parts having adhesive connections.

1.11. The surface of the electrical parts should be smooth, light and shiny without stretching, aids, cracks, incredible salts, corrosion products.

The degree of brilliance is not normalized.

The following signs are not broken on the electrolysed surface:

uneven glitter in areas having different thermal and mechanical processing;

separate matte and whiten areas on the surface of the parts to which decorative requirements do not impose;

traces of water flows;

lack of brilliance in welding places;

traces of contact with the device in the form of matte and dark plots;

mechanical polishing (if necessary) contact places with a device and to obtain accurate parts of the part after electropolishing;

black dots on the thread, if there are no other instructions in the regulatory and technical documentation;

traces of mechanical processing of the base metal before electropolishing and other deviations allowed by the regulatory and technical documentation for the main metal.

1.9-1.11. (Modified edition, change No. 1).

2. Requirements for coatings

2. 1. Requirements for the appearance of the coverage

2.1.1. The surface of the polished coating should be uniform, shiny or mirror.

2.1.2. On the surface of the coating, if there are no special instructions in the design documentation, the following signs are not broken:

traces of machining and other deviations allowed by the regulatory and technical documentation for the main metal;

minor waviness of the surface of the coating after an exhaust detectable after etching;

non-uniformity of glitter and ambiguity of color;

the ambiguity of the color of coatings on the details of plated metals with partial machining;

traces of water flows, chromatizing and phosphating solutions without salting residues;

shiny points and strokes formed from contact with measuring instrument, devices and from the impact of parts in the process of applying coatings in drums, bells and mesh devices;

change in color intensity or darkening after heating in order to inform and check the adhesion strength, removal of insulation and impregnation;

single black dots on areas designed to fill compounds, sealants, adhesives;

no coverage:

in the pores, places of inclusions allowed by regulatory and technical documentation for casting;

on the welded and soldered seams and near them at a distance of no more than 2 mm on the other side of the seam and in the inner angles of mutually perpendicular planes, subject to subsequent additional protection of these places;

in contact places, the part with the device, except for special cases specified in the design documentation.

displacement of coating boundaries up to 2 mm, and for gold coatings, palladium, rhodium and their alloys up to 1 mm in one direction or the other;

separate point inclusions of one coating on the surface of the other; Spot turning on the metal coating on the insulated surface;

metal darkening at the boundary of coatings;

the colors of running on unscrewed surfaces.

2.1.2, 2.1.3. (Modified edition, change No. 1).

2.2. Coverage thickness requirements

2.2.1. Excess of the maximum coating thickness is not a brave sign, if this does not affect the assembly and performance of the product.

(Modified edition, meas. No. 1).

2.3. The coating should be firmly linked with the main metal.

2.4. In appearance, thickness and other indicators, the coating must comply with the requirements of Table. 1 -19.

(Modified edition, change No. 1, 2).

2.5. Storage and transportation conditions of parts should exclude mechanical and chemical impacts resulting in damage to the coating.

Table 1

Zinc and cadmium coating. Chromate coatings on zinc and cadmium coatings. Phosphate coating on zinc coating

Name of the indicator	Requirements for coating
Appearance	Color zinc coating light gray or silver gray with a bluish tint.
	Cadmium coating color light gray or silver gray
	Color zinc coating with colorless chromating silver-gray or silver gray with a bluish tint. Multiple rainbow shades are allowed.
	The color of the zinc coating with rainbow chromating of green-yellow with rainbow shades.
	Cadmium coating color with rainbow chromating golden yellow with rainbow shades.
	Cynch coating color with khaki chromating with various shades.
	Cadmium coating color with khaki chromating from khaki to brown.
	Cynch coating color with black chromating black or black with green tint. Gray and rainbow shades are allowed on concave parts of details of the complex configuration.

	matte surface after preparation of the surface of the hydropuscore and metal-plated cleaning, tangling, etching;
	damage or weakening the intensity of the color of the chromate coating on the details after heat treatment;
	the darker or brightest shade of the chromate coating in the holes and grooves, on the inner surfaces and the concave parts of the details of the complex configuration, places of conjugation of all-point assembly units, sharp edges, corners, contact places with a device, between the springs with a small step;
	matte stripes around holes;
	single mechanical damage to chromate coating no more than 2%. total area.
	Color zinc coating with phosphating from light gray to dark gray. It is not a brave sign a small white raid in the deaf holes, grooves, etc. The phosphate coating on the zinc coating should be uniform and dense.
	On the surface are not allowed:
	slag deposition;
	uncoated stripes or stains; scratches that reach the main metal; corrosion foci; pollution from oils, lubricants or surfactants - for coatings intended for applying paints and varnishes. "
Thickness for zinc and cadmium coatings
The mass of the coating per unit area of \u200b\u200bthe surface	Colorless chromat coating - up to 0.5 g / m 2.
	Rainbow chromat coating - up to 1.0 g / m 2.
	Khaki colors Chromate coating - over 1.5 g / m 2.
	The phosphate coating intended for impregnation is at least 5.0 g / m 2.
	The coating intended for the paintwork - in accordance with the requirements of GOST 9.402-80
Structure	The phosphate coating intended for paintwork should have a microcrystalline structure
Protective properties	When tested chromate coatings with a solution of acetic acid, a solid dark spot should not appear before the expiration of the set time. When testing phosphate coating, the color of the test solution drops should not be changed to black for a set time.
Fullness washing	The electrical conductivity of the water after washing the phosphate coating intended for the paint coating should not exceed the three-time value of its source value
Oilness	The oil complex of phosphate coating is not less than 2.0 g / m 2

table 2

Copper coating and coating with copper alloys

Name of the indicator	Requirements for coating
Appearance	Copper coating color from light pink to dark red. The shade is not normalized.
	The color of the high-headed coating with a copper-tin alloy from light gray to gray. The shade is not normalized.
	The color of low-headed coating with alloy copper tin light yellow. The shade is not normalized.
	The color of the coating with alloy copper zinc from light yellow to light pink.
	On the coating are not branded signs of coloring, copper sprouts on the coating obtained in order to protect against cementation, darkening of the coating during storage to assembly
Thickness	In accordance with the requirements of the design documentation
Chemical composition	Mass fraction of copper in coatings alloys:
	Mr. (60) - from 50 to 60%;
	Mr. (88) - from 70 to 88%;
	M-c (90) - from 70 to 90%;
	M-C (70) - from 55 to 70%
Porosity	Coatings designed to protect against cementation should not have
Functional properties

Table 3.

Nickel coat

Name of the indicator	Requirements for coating
Appearance	The color of the matte nickel coating light gray with a yellow tinge, a brilliant nickel coating light gray. Dark color is allowed in the holes and grooves on the inner surfaces, concave parts of the details of the complex configuration and the places of conjugation of assembly units.
	The color of the chemical nickel coating gray with a yellow tint.
	Damage and rainbow tones are not branded signs after heat treatment, matte spots due to the uneven etching of the base metal. The color of black and thermally oxidized coating from black and gray to black. Colors of closures are allowed
Thickness	In accordance with the requirements of the design documentation.
	The thickness of the black nickel coating is not normalized.
	The thickness of the lower layer of the nickel three-layer coating of ND (NPB.NB) with respect to the total thickness of the coating 50-70%; The thickness of the upper layer is 50-30%.
	The thickness of the lower layer of the nickel three-layer coating of NT (NPB.NS.NB) with respect to the total thickness of the coating 50% or more; The middle layer is up to 10%, upper - up to 40%.
Chemical composition	Mass fraction of sulfur in the lower layer of nickel two-layer coating of ND (NPB.NB) to 0.005%; In the upper 0.05-0.09%.
	Mass fraction of sulfur in the lower layer of nickel three-layer coating of NT (NPB.NS.NB) to 0.005%; on average - not less than 0.15%; In the upper - 0.05-0.09%.
	Mass fraction of phosphorus in chemical nickel coating 3-12%
Porosity*	Not more than three through pores per 1 cm 2 surface area and 1 cm of the length of the edge. With a thickness of the coating of less than 24 μm or nickel thickness with a sublayer of less than 12 microns is not normalized
Functional properties	In accordance with the requirements of the design and (or) regulatory and technical documentation for the product
Protective properties	Also

Table 4.

Chrome coating

Name of the indicator	Requirements for coating
Appearance	The color of a brilliant coating light gray with a bluish tint.
	Matte coating color light gray.
	The color of solid (wear-resistant) coating light gray with a bluish or milky-matte.
	The color of the two-layer (corrosion-wear-resistant) coating light gray.
	The color of microporous and microcrack coatings from light gray to gray with a blue tint. The color of a microporous shiny coating obtained from electrolytes with trivalent chromium, from light gray to dark gray.
	Color of milk coating light gray.
	It is not brave signs of single point recesses up to 2% of the total area with a chromium thickness of more than 40 microns and a grid of cracks with a chromium thickness of more than24 microns. Black coating black with blue or brown tint.
	It is not a brave sign of a gray shade in inner corners, deepening and holes of complex details
Thickness	In accordance with the requirements of the design documentation
Porosity	No more than three through pores of 1 cm 2 surface area and 1 cm of the edge length, if there are no other instructions in the design documentation *.
	The porosity of the dairy chromium with a thickness of less than 24 microns, a protective-decorative two-layer thickness of less than 21 microns and a wear-resistant thickness of less than 40 microns is not normalized *.
	The number of pores on the surface of the microporous coating (H. MP) when evaluating using optical microscopes with an increase of at least 100 × should be at least 10,000 per cm 2.
	The porosity of black chromium is not normalized.
	At the surface of the chromium microcrack coating (x Mt) there should be at least 250 cracks at a length of 1 cm in all directions forming the grid of cracks
Functional properties	In accordance with the requirements of the design and (or) regulatory and technical documentation for the product
Functional properties	Coating hardness - according to GOST 9.303-84
Protective properties	Also
	When testing phosphate coating, the color of the test solution drops should not be changed to black for a set time.

* Requirements are presented to coating on steel details.

(Amendment. IUS 1-1991)

Table 5.

Tin coating and coating alloys of tin

Name of the indicator	Requirements for coating
Appearance	The color of melted and unknown coatings from light gray to gray. The melted coating is brilliant. It is allowed to uneven glitter on one piece.
	The color of the coating alloy tin-nickel light gray. Pink and purple shades are allowed.
	Color coating with tin-lead alloy from light gray to dark gray. The shade is not normalized.
	Color coating tin-bismuth from light gray to gray.
	Are not a brave sign of metal influx, which do not interfere with the assembly and not affecting the functional properties of the coating
Thickness
Chemical composition	Tin coatings intended for use in contact with food products must contain no more than 0.1% lead and not more than 0.025% of arsenic
	Mass fraction of tin in coatings alloys:
	O-H (65) is 50 to 70%;
	O-C (60) - T 50 to 70%;
	O-C (40) is 30 to 50%;
	O-C (12) is 8 to 15%.
	Mass fraction of bismuth in the coating of the O-WP alloy (99.8) from 0.2 to 4.0%
Porosity*	No more than three through pores per 1 cm 2 surface area and 1 cm of the edge length, if there are no other instructions in the design documentation.
Porosity*	With a thickness of the coating of 6 μm and less not normalized
Functional properties
Protective properties	Also

* Requirements are presented to coating on steel details.

Table 6.

Hot Tin Covers and Tin Lead Alloy

Name of the indicator	Requirements for coating
Appearance	The color of the tin coating from light gray to gray, the color of the coating with a tin-lead alloy from gray to dark gray. Coating brilliant or matte, smooth. The degree of brilliance is not normalized.

	minor slips and non-uniformity of the thickness of the coating that do not interfere with the soldering or work of the part;
	four-stranded splashes and metal drops that do not interfere with the work of the part, on non-working and working (sample) surfaces, as well as on surfaces on which coating is not provided, except for the sliding surfaces;
	dark spots on the coating on the inner surfaces of the deaf holes;
	minor jourver over the entire length of the wire and the deepening from the contact of the wire with the guide roller, not reaching the base metal;
	the ambulance color of the coating.
	Not allowed:
	rough influx;
	dark spots, points, unstained white or brown film;
	cracks, delays, non-flipped areas;
	solder splashes on working surfaces with precious metals (gold, silver, palladium, etc.);
	the remains of acid fluxes
Thickness	Not normalized
Chemical composition	The chemical composition of tin-lead alloy coatings must correspond to a chemical composition according to the main components of soldiers according to GOST 21930-76 and GOST 21931-76
Functional properties	In accordance with the requirements of the design and (or) regulatory and technical documentation for the product

Table 7.

Silver coating and silver-antimony alloy

Name of the indicator	Requirements for coating
Appearance	The color of silver coating and coating with a silver-antimony alloy scattered white.
	The color of silver coating from electrolytes with glossy-forming additives and silver chromated coating white with a yellowish tint.
	The color of the silver coating obtained by a chemical way, white.
	The color of the black silver coating from the dark gray daughter.
	The following signs are not broken:
	dark spots, stripes and colors of dealt with deaf holes, grooves, on concave parts of parts of a complex configuration;
	damage to the coating during storage to the assembly and a change in color from light pink to light brown after heat treatment, pressing in plastics, subject to the maintenance of functional properties
Thickness	In accordance with the requirements of the design documentation
Chemical composition	Mass fraction of antimony in the coating with a alloy of CP-SU from 0.4 to 2%
Porosity
Functional properties	In accordance with the requirements of the design and (or) regulatory and technical documentation for the product

Table 8.

Golden coating and coating alloys of gold

Name of the indicator	Requirements for coating
Appearance	Color of gold coating from light yellow to dark yellow
	Color coating with gold-nickel alloy from light yellow to yellow.
	Color coating alloy gold-cobalt from orange yellow to yellow
Thickness	In accordance with the requirements of the design documentation
Chemical composition	Mass fraction of stroke nickel alloy and mass fraction of cobalt in the coating with an ESL-Co. alloy - in accordance with the requirements of GOST 9.303-84
Functional properties	In accordance with the requirements of the design and (or) regulatory and technical documentation for the product

Table 9.

Palladium coating

Name of the indicator	Requirements for coating
Appearance	Color coating from light gray to gray with yellow tint.
Appearance	Are not a brave sign of single dark spots, rainbow shades from light brown to violet, resulting in heating, subject to the maintenance of functional properties
Thickness	In accordance with the requirements of the design documentation
Functional properties	In accordance with the requirements of the design and (or) regulatory and technical documentation for the product

Table 10.

Rhodium coat

Name of the indicator	Requirements for coating
Appearance	Color coating light gray with blue tint
Thickness	In accordance with the requirements of the design documentation
Functional properties	In accordance with the requirements of design and (or) regulatory and technical documentation for the product.

Table 11.

Chemical oxide coating on steel and cast iron

Name of the indicator	Requirements for coating
Appearance	Chim coating color. OX (including after impregnating oil) on parts of carbon and low-alloyed steels black with a blue tint. On the details obtained by the casting method, the black color of the coating with gray or brown shades is allowed.
	The color of the coating on the details of high-alloy steels from dark gray to dark brown with a cherry tint.
	The color of the coating on the details of cast iron and steels doped with silicon, from light yellow to dark brown.
	Color coating on details from high carbon tool steels black with gray tint
	The ambulance and shade on the details that have passed the local hardening, welding, cementation, slope and other mechanical processing are allowed; Red shade of coatings on small profiled parts and between the springs with a small step, light gray - on the sharp edges of the details
Thickness	Not normalized
Protective properties	On the coating of the chemical source after testing during the set time there should be no stains of contact with the stuffed copper.
Protective properties	On the coating of chemical ox. PRM after testing should not be foci of corrosion, with the exception of sharp edges and springs, on which no more than three corrosion points are allowed to 1 cm 2 surface area and 1 cm edge length

Table 12.

The coating obtained by the method of chemical passivation
on corrosion-resistant steadies.

Name of the indicator	Requirements for coating
Appearance	Color coating chemicalpace. Must correspond to the color of the metal being processed.
	The following signs are not broken:
	rainbow shades, depending on the steel grade, including in places of welding, bend;
	minor darkening;
	traces of mechanical finishing;
	black inclusions in the form of separate small points
Thickness

Table 13.

Chemical oxide and anodian oxide coating on copper and its alloys

Name of the indicator	Requirements for coating
Appearance	Color coating chemical ox and en. Soks from a dark red with a brown tinge to black with a blue tint

	traces of mechanical finishing of the surface of the base metal;
	partial absence of coating on sharp edges;
	damage between springs springs with a small step.
	The color of the coating of the chemicalpace must correspond to the color of the metal being processed.
	The following signs are not broken:
	rainbow shades;
	damage to the coating between the springs with a small step;
	the indifference of the lacquer film in color and dripping lacquer after varnishing, which do not interfere with the assembly and not affecting the performance of the product
Thickness	Not normalized
Protective properties	When testing on the coating of chemicalpass, there should be no change in the color of the drop to the blue until the set time expires

Table 14.

Chemical oxide coating on aluminum and its alloys

Name of the indicator	Requirements for coating
Appearance	Color coating chemical ox from gray-blue to dark blue or salad-blue to green or yellow
	on alloy brands D16, D1, D24F - greenish blue with rainbow shades or without them;
	on foundry alloys - gray-blue with black and brown divorces.
	The color of the coating of chemicalpace corresponds to the color of the base metal.
	Color coating chemical ox.E from colorless to light blue or light yellow; from golden yellow to brown with rainbow shades on deformable alloys; Gray with yellow and brown divorces on casting alloys.
	The following signs are not broken:
	dark and bright stripes in the rolling direction, soldering and welding places;
	damage on the details soldered by high-temperature soldering;
	separate spots from chrome salts around the holes, in places of contact of parts with a device, places of pairing of all-in-block assembly units, around the pores and places of inclusions allowed by the regulatory and technical documentation for casting;
	identification of the structure of the main metal
Thickness	Not normalized
Protective properties
Functional properties	In accordance with the requirements of the design and (or) regulatory and technical documentation for the product

Table 15.

Anodic oxide coating on aluminum and its alloys

Name of the indicator	Requirements for coating
Appearance	The color of the coating an.oks from light gray to dark gray, on the details of the casting alloys from light gray to dark brown. The shade is not normalized.
	The color of the painted coating should correspond to the color of the sample. The shade is not normalized. On multicomponent and casting alloys, glare of various tones are possible.
	Color coating An.oks.Hrom from milk to gray, rainbow shades are possible.
	The color of the coating an.x.nhr from light green to yellow-green, on multicomponent and casting alloys from gray to dark gray. The shade is not normalized.
	The following signs are not broken:
	dark and stains as a result of the detection of heterogeneity of the structure of the base metal;
	dark and light stripes in the direction of rolling, places of welding, ticking, latch, places of lack of a plating layer;
	yellow spots from chrome salts around the holes, in the grounds of contact details with a device, in places of conjugation of all-in-block assembly units, around the pores and places of inclusions allowed by the regulatory and technical documentation for casting.
	Color coating An.x.TV from light gray to black, yellow-green shades are allowed.
	The color of the coating an.ox. Eases from light yellow to dark brown or from light gray to dark gray.
	Color coating An.x.TV and An.x.EZ after filling with chromates from yellow-green to brown-black.
	It is not a brave sign on the coverage of an ant. Ease of microcracks, if they do not affect the functional properties.
	Color coating An.oks.EMT from light gray to dark gray, depending on the alloy used, enhaid. The shade is not normalized.
	The color of the painted coating must match the color of the sample
	Color coating anotter light brown, gray-blue, blue-black, golden, golden-bronze, bronze, gray brown.
	It is allowed a lighter tone on the inner surfaces of the details.
Thickness	In accordance with the requirements of the design documentation
Quality of filling coating	After testing loss of the sample, the sample should not exceed 20 mg / dm 2 for products intended for operation in an open atmosphere, and 30 mg / dm 2 for products intended for use in a closed room.
Quality of filling coating	After testing, the coating should not be stained or can be painted slightly!
Fullness washing	The electrical conductivity of the water after washing the coating of An.oks.EIZ should not exceed the three-time value of its initial value
Protective properties	When testing should not be observed a change in the color of the test solution drops until the set time expires.
Functional properties	In accordance with the requirements of the design and (or) regulatory and technical documentation for the product

Table 16.

Anodian oxide coating on titanium alloys

Name of the indicator	Requirements for coating
Appearance	Color coating anotter from blue to blue, pink, green, yellow. The shade is not normalized.
	Are not a brave sign traces of mechanical finishing of the main metal surface
	Color coating An.oks from light gray to dark gray
Thickness	Not normalized
Functional properties	In accordance with the boards of design and (or) regulatory and technical documentation for the product

Table 17.

Chemical oxide and anodian oxide coating
on magnesium and magnesium alloy

Name of the indicator	Requirements for coating
Appearance	Color coating chemical ox from straw yellow to dark brown or black.
	Color coating chemical phos from light gray to dark gray.
	Color coating anotter yellow, green or gray-black. The shade is not normalized.
	The following signs are not broken:
	colors of rugs; stains formed during re-oxidation; Point plots of metal without coating around me; Gray stains with a mosgeing flaw on ML-5 alloy;
	black spots on mechanically processed surfaces, which are a consequence of local metal heating viscore processing
Thickness	Cover thickness Him. Soks is not normalized, An.oks - in accordance with the requirements of the design documentation

Table 18.

Phosphate coating on steel and cast iron

Nameindicator	Requirements of kpocrytia
Appearance	The color of the coating from light gray to black, after impregnation with oil, emulsion or after hydrophobication from dark gray to black.
	The following signs are not broken:
	the heterogeneity of the crystal sizes in the areas of local quenching, welding, stagnation, various surface roughness on the decarbered areas;
	white plaque removed by wiping;
	flaw of phosphate sludge on non-working surfaces;
	traces of the copper electrode on parts welded with point or roller welding;
	stains, divorces and floors after wiping emulsion, varnish or after hydrophobic, which do not interfere with the assembly and not affecting the performance of the product;
	yellow spots from chrome salts around holes, contact places Parts with adaptation and places of conjugation of assembly units, stains around the pores and places of inclusion, allowed by regulatory technical documentation for casting
The mass of the coating per unit area of \u200b\u200bthe surface	The mass of coating per unit of surface area before impregnation is at least 5 g / m 2; on surface with roughnessR. a. 1.25-0.63 μm is allowed to reduce the mass of the coating per unit area of \u200b\u200bthe surface in accordance with the requirements of the regulatory and technical documentation.
	The mass of the coating on the unit of the surface area before applying the paint coating in accordance with the requirements of GOST 9.402-80
Structure	The coating intended for the paintwork should have a microcrystalline structure.
Protective properties	When testing according to GOST 9.302-88, the color of the drops during the set time is not to change or after testing on the coating there should be no foci of corrosion, with the exception of sharp edges, pairing sites of all-point assembly units, where no more than three point corrosion foci is allowed to 1 cm 2 Surface area and 1 cm edge length
Oilness	Not less than 2.0 g / m 2
Fullness washing	The electrical conductivity of water after washing the coating intended for the paintwork should not exceed the three-time value of its original value.

Table 19.

Chemical oxide chromatic and phosphate coating on zinc alloys

Name of the indicator	Requirements for coating
Appearance	Color coating chemical ox. chrome greenish-yellow with rainbow shades; If there are copper objects, the color of the coating gray blue; Color coating chemical phos from light gray to gray.
	The following signs are not broken:
	matte surface and weakening of the intensity of the color of the chromate coating on the details after heat treatment, hydroplast cleaning, tanting andetching;
	the darker or brightest shade of a chromate coating in the holes and grooves, on the inner surfaces and on the concave parts of the details of the complex configuration, on the places of pairing of all-in-block assembly units, on sharp edges, corners, in contact places with a device, between the springs with a small step;
	matte stripes near holes
	single mechanical damage to chromate coating no more than 2%
Thickness	Not normalized