Designation of coatings. Protective coatings

8. Designations of base metal processing methods

9. Designation of methods for obtaining coating

* The method of producing coatings colored during the anodic oxidation of aluminum and its alloys, magnesium and its alloys, titanium alloys is designated “Anocolor”.
** The method of producing coatings by thermal decomposition of organometallic compounds is designated MosTr.

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

10. Designations of coating material consisting of metal

The coating material, consisting of an alloy, is designated by the symbols of the components that make up the alloy, separated by a hyphen, and the maximum maximum mass fraction the first or first and second (in the case of a three-component alloy) components in the alloy, separated by a semicolon.
Examples of 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%

M-O-S (78; 18).

11. Designations of nickel and chrome coatings

If necessary, technical requirements drawing indicate symbol chemical element or the formula of a chemical compound used as a coprecipitate.
Note. It is allowed to use abbreviations and indicate the total thickness of the coating.
In the designation of the alloy coating material (Table 12), if necessary, it is allowed to indicate the minimum and maximum mass fractions of components,
for example, coating with a gold-nickel alloy with a mass fraction of gold 93.0-95.0%, nickel 5.0-7.0%
denoted Zl-N (93.0-95.0).
In the designation of coating with alloys based on precious metals watch parts and jewelry It is allowed to indicate the average mass fraction of components.
For newly developed alloys, the components are designated in order of decreasing their mass fraction.

12. Designations of alloy coatings

The designation of the coating material obtained by the burning method indicates the brand of the starting material (paste) in accordance with the regulatory and technical documentation. In the designation of solder coating obtained by the hot method, indicate the brand of solder in accordance with GOST 21930-76, GOST 21931-76.
The designations for non-metallic inorganic coatings are given below:

If it is necessary to indicate the electrolyte (solution) from which the coating is to be obtained, use the designations given in the mandatory appendices to GOST 9.306-85.
Electrolytes (solutions) not listed in the appendices are indicated by their full name,
For example,

Ts9. ammonium chloride. xp, M15. pyrophosphate.

13. Designations of functional properties of coatings.

14. Designations of decorative properties of coatings

*The color of the coating, corresponding to the natural color of the deposited metal (zinc, copper, chromium, gold, etc.), does not serve as a basis for classifying the coating as painted. The color of the coating is indicated by its full name, with the exception of the black coating -ch.

15. Designations additional processing coatings

* If necessary, indicate the color of the chromate film:
khaki - khaki, colorless - btsv; rainbow film color - no designation.
The designation of additional treatment of the coating by impregnation, hydrophobization, or application of paint and varnish coating may be replaced by the designation of the brand of material used for additional processing.
The grade of material used for additional coating processing is designated in accordance with the regulatory and technical documentation for the material.
The designation of a specific paint coating used as an additional treatment is carried out in accordance with GOST 9.032-74.
Methods of preparation, coating material, designation of electrolyte (solution), properties and color of the coating, additional processing not listed in the standard are designated by technical documentation or write down the full name.
The order of coating designation in technical documentation:
designation of the method of processing the base metal (if necessary);
designation of the method of obtaining the coating;
designation of coating material;
minimum coating thickness;
designation of the electrolyte (solution) from which the coating is required (if necessary) (Table 15 a; 15 b);
designation of functional or decorative properties of the coating (if necessary);
designation of additional processing (if necessary).

The designation of the coating does not necessarily contain all of the listed components.
If necessary, it is allowed to indicate the minimum and maximum thickness hyphenated
It is allowed to indicate the production method, material and thickness of the coating in the designation of the coating, while the remaining components of the symbol are indicated in the technical requirements of the drawing.
A coating thickness equal to or less than 1 micron is not indicated in the designation unless there is a technical need (except for precious metals).

Coatings used as technological
(for example, zinc during zincate processing of aluminum and its alloys, nickel on corrosion-resistant steel, copper on copper alloys, copper on steel made from cyanide electrolyte before acid copper plating) may not be indicated in the designation.
If the coating is subjected to several types of additional processing, they are indicated in technological sequence.
The coating designation is recorded on a line. All components of the designation are separated from each other by dots, with the exception of the coating material and thickness, as well as the designation of additional paint coating treatment, which is separated from the designation of a metallic or non-metallic inorganic coating by a fraction line.
The designation of the production method and coating material should be written in capital letters, the remaining components - in lowercase letters.
Examples of recording the designation of coatings are given in table. 16.

15a. Designations of electrolytes for producing coatings (according to GOST 9.306-85)

15b. Designations of solutions for obtaining coatings

16. Examples of writing coating designations

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UNIFIED SYSTEM FOR PROTECTION AGAINST CORROSION AND AGING

METAL AND NON-METALLIC INORGANIC COATINGS

TYPES, THICKNESS RANKS AND DESIGNATIONS

GOST 9.073-77

Price 5 kopecks.

Official publication

USSR STATE COMMITTEE ON STANDARDS

UDC 620.197: 006.354 Group T94

STATE STANDARD OF THE USSR UNION

Unified system of protection against corrosion and aging METAL AND NON-METALLIC INORGANIC COATINGS

Types, thickness ranges and designations

Unified system of corrosion and aging protection. Metal and non-metal inorganic coatings. Kinds, thickness ranges and symbols

Resolution State Committee standards of the Council of Ministers of the USSR dated April 19, 1977 No. 968 validity period established

from 07/01/1978 to 07/01/1983

Failure to comply with the standard is punishable by law

This standard applies to metallic and non-metallic inorganic protective, protective-decorative and special coatings (in further coverage) received on various materials, and establishes types of coatings, ranges of coating thicknesses, with the exception of non-metallic inorganic ones, and designations of coatings in design, technological and other regulatory and technical documentation approved in the prescribed manner.

1. TYPES OF COATING

1.1. Coatings are divided into types depending on the combination of the first two or more characteristics:

method of obtaining coating; coating material;

signs characterizing the physical and mechanical properties of the coating;

features characterizing the decorative properties of the coating; type of additional coating treatment.

Official publication ★

1.2. Methods for producing coatings

Reproduction is prohibited

Reissue. December 1979

F Standards Publishing House, 1981

Table 9

Coating

Symbol

Kdb. oke phos. hr. prm Htv24

Hmol24, Htv12

Ml5. Nt21, X. b or

Ml5. H9. pb. NSZ. H9. b. X. b.

TsZ-6. phos M-O-S (78; 18)9 O-S (60) 3. opl

Kdb/Enamel VL-515 red-brown

TU MHP 138-59.III.6/2 GT. H9. CD 3. xp

Production method - cathodic reduction

Cadmium 15 microns thick, chromated

Cadmium 6 microns thick, phosphated in a solution containing barium nitrate, chromated and impregnated with oil Chrome solid 24 microns thick Chrome two-layer: “milky” 24 microns thick, hard 12 microns thick Nickel 15 microns thick, matte, treated with a water-repellent liquid 136- 41

Chrome with a thickness equal to or less than 1 micron, shiny with an underlayer of copper 15 microns thick and three-layer nickel 21 microns thick

Zinc 3 microns thick, phosphated for threaded parts with a thread pitch of up to 0.45 mm (with a limitation on the maximum thickness)

Coating with a copper-tin-lead alloy with a mass fraction of copper 70-78%, 10-18% tin, 4-20% lead with a thickness of 9 microns Coating with a tin-lead alloy with a mass fraction of tin 55-60% with a thickness of 3 microns, fused

Cadmium 6 microns thick followed by painting with red-brown enamel VL-515 according to class III for the operation of the coating when exposed to petroleum products Cadmium 3 microns thick over a nickel sublayer 9 microns thick, chromated with subsequent heat treatment to form a diffusion layer

Chem. H9. gfj chem. N-F(94) 15 Chem. Okay. paintwork

Chem. Phos/Enamel AS-182 blue

An. Oke TV 30. prm An. Oke TV oil 137-02 TU 6-02-897-74

An. Okay. xp

Anotsvet. bronze

An. Oke Fluorine, LCP An. Fluorine Chromium Phos

Method of production - hot

Coating with a tin-lead alloy from antimony-free solder, made in the form of ingots of the Pos 40 brand

Production method: metallization

Aluminum 60 microns thick I Met. A60

Combination of receiving methods

Silver, obtained by cathodic reduction, 12 microns thick with an underlayer of nickel, obtained by a chemical method, 3 microns thick, and copper, 3 microns thick, obtained by cathodic reduction

Chem. NZ. M3. Wed12

1.2.1. Methods for producing coatings and their symbols are given in table. 1.

* The method of producing a galvanic two-layer coating, subjected to subsequent heat treatment to form a diffusion layer, is designated GT (galvanic-thermal method).

** The method of producing coatings that are painted during the anodic oxidation of aluminum and its alloys is designated “Anotsvet” according to GOST 21484-76.

*** Chemical method obtaining oxide coatings on copper and its alloys, corrosion-resistant steels, as well as on carbon, low- and medium-alloy steels from acidic solutions is designated Chem.Pas.

1.3. Coating material

1.3.1. A coating material consisting of one metal is designated by symbols in the form of one or two letters included in the Russian name of the corresponding metal.

Legend coating materials consisting of one metal are given in table. 2.

1.3.2. The designation of the composite coating material indicates the coating metal according to the table. 2 and in parentheses the symbol of a chemical element or the formula of a chemical compound used as a coprecipitate. For example, nickel with aluminum oxide - HalO3), chromium with silicon oxide - X (Si0 2).

1.3.3. The coating material, consisting of an alloy, is designated by the symbols of the components included in the alloy, separated by a hyphen, and the maximum mass fraction of the First or first and second (in the case of a three-component alloy) components in the alloy is indicated in parentheses, separating them with a semicolon. For example, a coating made of a copper-zinc alloy with a mass fraction of copper 50-60% and zinc 40-50% is designated M-C (60); alloy coating

va copper-tin-lead with a mass fraction of copper 70-78%, tin 10-18%, lead 4-20% is designated M-O-C (78; 18).

If necessary, in the designation of the alloy coating material, it is allowed to indicate the maximum and minimum content of components, for example, coating with a gold-silver-copper alloy with a mass fraction of gold 98-99.6%, silver 0.2-1%, copper 0.2-1% denote Zl-Sr-M (98-99.6; 1-0.2).

When designating coatings with alloys based on precious metals on parts of watches and jewelry, it is allowed to indicate the average mass fraction of the components.

1.3.4. Symbols for alloy coating components are given in Table. 3.

1.3.5. The material of non-metallic inorganic coatings is designated by the abbreviated name of the main chemical compounds, included in the coating, according to table. 4.

* In technological normative and technical documents, in the designation of the material of coatings obtained by the burning method, indicate the brand of the source material (paste) in accordance with the normative and technical documentation; approved in the prescribed manner (hereinafter referred to as technical documentation).

** Designated when obtaining a coating with a given mass fraction of boron (phosphorus).

*** In technological normative and technical documents, the designation of coating material obtained by hot method from solders indicates the brand of solder in accordance with GOST 21930-76, 21931-76.

1.3.6. If necessary, the designation of the coating material indicates the sign of the electrolyte (solution) from which the coating is obtained.

Oxide coating on aluminum and its alloys: from an electrolyte based on chromic anhydride. Oke chromium from an electrolyte containing sulfuric, sulfosalicylic and

oxalic acid.........Ok also

from electrolytes containing oxalic acid, titanium, zirconium or thallium salts, as well as from an electrolyte containing chromic anhydride and boric acid. . Oke emt

from a solution containing chromic anhydride and fluorides............Oke fluorine

from a solution containing chromic anhydride, orthophosphorus

nic acid and fluorides......Oke phospho fluorine

Phosphate coating on carbon, low and medium alloy steels and cast iron:

from solutions containing barium nitrate. . Oke phos

1.4. Symbols of signs characterizing the physical and mechanical properties of coatings are given in Table. 5.

1.5. Symbols of features characterizing the decorative properties of the coating are given in GOST 21484-76.

1.6. Types of additional coating processing and their symbols are given in table. 6.

Notes:

1. The method of additional processing is not indicated in the designation.

2. Phosphating in a solution containing barium nitrate is designated oke phos.

1.6.1. When impregnating with oil and applying paint and varnish, instead of indicating the type of additional processing, it is allowed to indicate the brand of material used for this purpose.

When specifying a specific paint coating on a metallic or non-metallic inorganic coating, their designation is made according to GOST 9.032-74.

When hydrophobizing, if necessary, it is allowed to indicate the type of additional processing and the brand of material used for this purpose.

When impregnating, after the designation “prp” the brand of material used for this purpose is indicated.

1.7. Methods of production, characteristics of the electrolyte (solution), coating material and types of additional processing not listed in this standard are indicated by the full name or according to the technical documentation.

For newly developed alloys, the components are designated in order of decreasing their mass fraction.

2. RANKS OF THICKNESS

2.1. The minimum thickness of the coating on the working surface of the product (part) is selected from the thickness series according to the table. 7.

GOST 9.073-77 Page 7

Note. Working (significant) surface is a part of the surface of a product (part) to which requirements are imposed for anti-corrosion* decorative or special properties.

2.2. Ranges of thicknesses of coatings with precious metals for parts of watches and jewelry, as well as ranges of thicknesses for coatings obtained by methods not listed in Table. 7, are established in the technical documentation.

2.3. The maximum coating thickness is set according to table. 7:

for metal coatings according to subparagraph 1, the maximum thickness should be no more than the value following the established minimum; for example, for gold coatings with a minimum thickness of 0.5 microns, the maximum thickness can be up to 1.0 microns;

for metal coatings according to subparagraphs 2 and 3, the maximum thickness should be no more than one numerical value beyond the established minimum; for example, for nickel coatings with a minimum thickness of 6 µm, the maximum thickness can be up to 12 µm.

In technically justified cases, for example, for products (parts) complex configuration, it is allowed to increase the maximum thickness of the coating without changing the minimum thickness and

Page Kommersant GOST *.073-77

increasing metal consumption rates, provided that parts are mated and normal operation products (parts).

It is not allowed to increase the maximum thickness for coatings with precious metals.

2.4. For multilayer coatings, the requirements of clause 2.3 apply to each layer of coating.

2.5. The maximum thickness of coatings for parts that are subject to requirements for limiting the tolerance range is established according to technical documentation.

3. COATING DESIGNATION

3.1. The designation indicates the type of coating and the minimum thickness.

If necessary, it is allowed to indicate the minimum and maximum thicknesses separated by a hyphen in the designation of the coating.

The thickness of coatings with precious metals for parts of watches and jewelry is indicated according to technical documentation.

3.2. The coating is designated in the following order:

method of obtaining - according to table. 1;

material - according to table. 2-4, 8;

physical and mechanical properties - according to table. 5;

thickness - according to table. 7;

type of additional processing - according to table. 6 and clause 1.6.1.

In the designation of coatings obtained by the Chem. Pass, the covering material is not specified.

The designation of protective and decorative coatings with specified decorative properties is carried out according to GOST 21484-76.

3.3. The designation of multilayer coatings, including coatings consisting of layers of the same material that differ in properties, indicates the type of coating layer by layer in the order of application, as well as the thickness of each layer.

3.4. Symbols for the types of two- and three-layer nickel and two-layer chrome coatings are given in Table. 8.

Table 8

Note. It is allowed to use abbreviated symbols for two- and three-layer nickel coatings and indicate the total thickness of the coating.

3.5. Coating thickness according to clause 2 of table. 7, equal to or less than 1 micron, is not indicated in the designation unless there is a technical need.

3.6. Coatings used as a technological sublayer (for example, zinc during zincate processing of aluminum and its alloys, nickel on corrosion-resistant steel, copper on copper alloys, copper on steel obtained from a cyanide electrolyte before acid copper plating, gold before applying a gold-silver alloy ), not indicated in the designation.

3.7. If the coating is subjected to several types of additional processing, then all of them are indicated in technological sequence and the designations are separated by a dot.

3.8. The grade of material used for additional coating processing is designated in accordance with the technical documentation.

3.9. The designation of the coating is recorded in a line, while the designation of the method of production and material of the coating, thickness, decorative properties and type of additional processing are separated by dots; designations of material, characteristics of electrolyte (solution), physical and mechanical properties and thickness are not separated by dots.

The designation of the production method and coating material should be written with a capital letter, other characteristics - with a lowercase letter,

Examples of coating designations are given in table. 9.

1. Coatings according to DIN/ISO

The technical delivery conditions given in the ISO 4042 standard define the following types of marking of coatings applied by the electrolytic method (cold galvanizing, electroplating):

1. Coverage code
   A = zinc (Zn)
2. Thickness code
   2 = 5 µm
3. Finish code
   A = semi-gloss, blue passivation

2. Coatings according to GOST

Methods for marking coatings are defined by the standard GOST 9.306-85. The procedure for designating the coating in the technical documentation includes the following sections:

Coating material designation

The coating material, consisting of metal, is designated by symbols in the form of 1 or 2 letters included in the name of the corresponding metal.

For example: cadmium - “Cd”, tin - “O”.

The coating material, consisting of an alloy, is designated by the symbols of the components included in the alloy, separated by a hyphen, and the maximum mass fraction of the first or second (in the case of a three-component alloy) components in the alloy is indicated in parentheses, separated by a semicolon.

For example, M-C (60%) means coating with a copper-zinc alloy with a copper mass fraction of 60%.

Designation of non-metallic inorganic coatings:

A) Oxide - Ox

B) Phosphate - Phos

Minimum coating thickness

Coating thickness equal to or less than 1 micron is not indicated in the designation (except for precious metals).

Designation of the method of obtaining the coating

The coating method is designated by 2-3 letters included in the name of this method.

For example, the method of thermal diffusion coating is designated - TD, hot-dip galvanizing - Gor.

Designation of the method of processing the base metal, functional or decorative properties of the coating, additional treatment of the coating surface may, if necessary, be indicated in the designation of the coating. In this case, the abbreviation principle is used, when these properties are identified by the first 1-3 letters.

For example, the coating designation M30.Nt15.H.b means:

Chrome coating with a thickness of 0.5-1 microns, shiny, with a sublayer of copper 30 microns thick and three-layer nickel 15 microns thick.

In order to simplify the identification of coatings, a digital designation of the coating has been adopted, in which the first 2 digits indicate the type of coating, and the third the thickness of the coating in microns (µm). The table shows the correspondence of the digital designations of the most common types of fastener coatings:

Abbreviations used at Stroymetiz for the main types of coating:

This article presents the letter designations (code) of the type, type and thickness of galvanic coatings, according to GOST 9.306-85 on parts. Examples of recording in the drawings are presented. The designation of galvanizing, chromating, nickel plating, copper plating, chrome plating, anodizing, oxidation, tin plating (tin-bismuth) of metal is shown.

According to GOST 9.306-85

Base metal processing method:

Kravtsevaniye - krts

Electrochemical polishing - ep

Stamping - shtm

"Snow" etching - snzh

Hatching - line

“Pearl-like” treatment - w

Vibration rolling - fbr

Drawing arcuate lines - for

Diamond processing - alm

Drawing hair lines - ow

Satin - stn

Passivation - Chem. Pass

Matting - MT

Mechanical polishing - MP

Chemical polishing - HP

Coating method:

Cathodic reduction -

Condensation (vacuum) - Con

Anodic oxidation* - An

Contact - Kt

Chemical - Chem

Contact-mechanical - Km

Hot - Gore

Cathode sputtering - Kr

Diffusion - Diff

Burning - Vzh

Thermal spraying - According to GOST 9.304-87

Enameling - Em

Thermal decomposition** - Tr

Cladding - PC

* The method of producing coatings colored during the anodic oxidation of aluminum and its alloys, magnesium and its alloys, titanium alloys is designated “Anocolor”.

**The method of producing coatings by thermal decomposition of organometallic compounds is designated Mos Tr

Designation of metal coating (including non-metallic coatings):

1. The coating material, consisting of metal, is designated by symbols in the form of one or two letters included in the Russian name of the corresponding metal.

2. The coating material, consisting of an alloy, is designated by the symbols of the components included in the alloy, separated by a hyphen, and the maximum mass fraction of the first or second (in the case of a three-component alloy) components in the alloy is indicated in parentheses, separating them with a semicolon. For example, coating with a copper-zinc alloy with a mass fraction of copper 50-60% and zinc 40-50% is designated M-C (60); coating with a copper-tin-lead alloy with a mass fraction of copper 70-78%, tin 10-18%, lead 4-20% is designated M-O-C (78; 18).

3. In the designation of the alloy coating material, if necessary, it is allowed to indicate the minimum and maximum mass fractions of components, for example, coating with a gold-nickel alloy with a mass fraction of gold of 93.0-95.0%, nickel of 5.0-7.0% is designated Zl- N (93.0-95.0).

4. In designating the coating of watch and jewelry parts with alloys based on precious metals, it is allowed to indicate the average mass fraction of the components.

For newly developed alloys, the components are designated in order of decreasing their mass fraction.

5. In the designation of the coating material obtained by burning in, indicate the brand of the starting material (paste) in accordance with the regulatory and technical documentation.

6. In the designation of solder coating obtained by the hot method, indicate the brand of solder in accordance with GOST 21930-76, GOST 21931-76.

Aluminum - A

Palladium - Front

Bismuth - Vi

Platinum - Pl

Tungsten - B

Rhenium - Re

Iron - F

Rhodium - Rd

Gold - Zl

Ruthenium - Ru

Indium - In

Lead - C

Iridium - Ir

Silver - Wed

Cadmium - Kd

Antimony - Su

Cobalt - Co

Titan - Ti

Copper - M

Chrome - X

Nickel - N

Zinc - C

Tin - O

Oxide - Oks

Phosphate - Phos

Aluminum-zinc - A-C

Nickel-phosphorus - N-F

Gold-silver - Zl-Sr

Nickel-cobalt-tungsten - N-Ko-V

Gold-silver-copper - Zl-Sr-M

Nickel-cobalt-phosphorus - N-Co-F

Gold-antimony - Zl-Su

Nickel-chrome-iron - N-H-F

Gold-nickel - Zl-N

Tin-Bismuth - O-Vee

Gold-zinc-nickel - Zl-C-N

Tin-cadmium - O-Cd

Gold-copper - Zl-M

Tin-cobalt - O-Ko

Gold-copper-cadmium - Zl-M-Kd

Tin-nickel - O-N

Gold-cobalt - Zl-Ko

Tin-lead - O-S

Gold-nickel-cobalt - Zl-N-Co

Tin-zinc - O-C

Gold-platinum - Zl-Pl

Palladium-nickel - Pd-N

Gold-Indium - Zl-In

Silver-copper - Sr-M

Copper-tin (bronze) - M-O

Silver-antimony - Sr-Su

Copper-tin-zinc (brass) - M-O-C

Silver-palladium - Sr-Pd

Copper-zinc (brass) - M-C

Cobalt-tungsten - Co-V

Copper-lead-tin (bronze) - M-S-O

Cobalt-tungsten-vanadium - Ko-V-Va

Nickel-boron - N-B

Cobalt-manganese - Co-Mts

Nickel-tungsten - N-V

Zinc-nickel - C-N

Nickel-iron - N-F

Zinc-titanium - C-Ti

Nickel-cadmium - N-Cd

Cadmium titanium - CD-Ti

Nickel-cobalt - N-Co

Chrome vanadium - X-Va

Chrome-carbon - X-U

Titanium nitride - Ti-Az

Designation of functional properties:

Solid - TV

Electrical insulating - eiz

Electrically conductive - uh

Designation of decorative properties of coatings:

Mirror

Brilliant

Semi-shiny

Matte

Gladkoe

Slightly rough

Rough

Very rough

Pictured

Crystalline

Layered

Colored (color name)

* The color of the coating corresponding to the natural color of the deposited metal (zinc, copper, chromium, gold, etc.) does not serve as a basis for classifying the coating as painted.

The color of the coating is indicated by its full name, with the exception of black coating - part.

Additional coating treatment:

Hydrophobization - gfzh

Filling in water - nv

Filling in chromate solution - nhr

Application of paint and varnish coating - paintwork

Oxidation - ox

Reflow - reflow

Impregnation (varnish, glue, emulsion, etc.) - prp

Oil impregnation - prm

Heat treatment - t

Toning - tn

Phosphating - phos

Chemical coloring, including filling in a dye solution - Color name

Chromating* - хр

Electrochemical staining - el. Color name

* If necessary, indicate the color of the chromate film: khaki - khaki, colorless - btsv; rainbow film color - no designation.

8. The designation of additional treatment of the coating by impregnation, hydrophobization, or application of paint and varnish coating may be replaced by the designation of the brand of material used for additional processing.

The grade of material used for additional coating processing is designated in accordance with the regulatory and technical documentation for the material.

The designation of a specific paint coating used as an additional treatment is carried out in accordance with GOST 9.032-74.

9. Methods of preparation, coating material, designation of the electrolyte (solution), properties and color of the coating, additional processing not listed in this standard are indicated according to the technical documentation or written down by the full name.

10. The order of coating designation in technical documentation:

designation of the method of processing the base metal (if necessary);

designation of the method of obtaining the coating;

designation of coating material;

minimum coating thickness;

designation of the electrolyte (solution) from which the coating is required (if necessary);

designation of functional or decorative properties of the coating (if necessary);

designation of additional processing (if necessary).

The designation of the coating does not necessarily contain all of the listed components.

If necessary, it is allowed to indicate the minimum and maximum thicknesses separated by a hyphen in the designation of the coating.

It is allowed to indicate the production method, material and thickness of the coating in the designation of the coating, while the remaining components of the symbol are indicated in the technical requirements of the drawing.

(Changed edition, Amendment No. 2).

11. Coating thickness equal to or less than 1 micron is not indicated in the designation unless there is a technical need (except for precious metals).

12. Coatings used as technological coatings (for example, zinc during zincate processing of aluminum and its alloys, nickel on corrosion-resistant steel, copper on copper alloys, copper on steel made from cyanide electrolyte before acid copper plating) may not be indicated in the designation.

13. If the coating is subjected to several types of additional processing, they are indicated in technological sequence.

14. The coating designation is written down on a line. All components of the designation are separated from each other by dots, with the exception of the coating material and thickness, as well as the designation of additional paint coating treatment, which is separated from the designation of a metallic or non-metallic inorganic coating by a fraction line.

The designation of the production method and coating material should be written with a capital letter, the remaining components - with lowercase letters.

Examples of recording the designation of coatings are given in Appendix 4.

(Changed edition, Amendment No. 1, 2, 3).

15. The procedure for designating coatings according to international standards is given in Appendix 5.

16. Introduced additionally (Changed edition, Amendment No. 3).

Designation of nickel and chrome coatings (abbreviated/full):

Nickel, obtained shiny from an electrolyte

with shine-forming additives, containing

more than 0.04% sulfur -/Nb

Nickel matte or semi-shiny,

when tested for tensile strength no less than 8% -/Npb

Nickel containing 0.12-0.20% sulfur -/Hs

Nickel two-layer (duplex) Nd/Npb. Nb.

Nickel three-layer (triplex) Nt/Npb. Ns. Nb

Nickel two-layer composite

Nickel-sil* Nsil/Nb. NZ

Nickel two-layer composite Ndz/Npb. NZ

Nickel three-layer composite Ntz/Npb. Ns. NZ

Chrome regular -/X

Chrome porous -/Chp

Chrome microcrack -/Hmt

Chrome microporous -/Hmp

Chrome “milk” -/Hmol

Chrome two-layer HD/Hmol. X. TV

Examples:
Zinc 15 microns thick with khaki chroming - Ts15. hr. khaki

Chrome 0.5-1 microns thick, shiny, with a sublayer of nickel 9 microns thick - Nsil9. H. b

Chrome 0.5-1 microns thick, shiny, with an underlayer of copper 30 microns thick and three-layer nickel 15 microns thick - M30.Nt15. H. b

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The word "corrosion" comes from the Latin " corrosio"which means" fret"Corrosion is the physical and chemical process of destruction of materials and products made from them, leading to a deterioration in their performance properties, under the influence of environment. To prevent corrosion, many methods and means have been invented.

You can learn more about corrosion from the film:

Types and Designation of Coatings

There are quite a large number of coatings applied in various ways on fasteners. All coatings can be divided into three types: protective, protective-decorative, decorative.

On the territory of the republics former USSR, V present moment, the following symbols are accepted for the types of protective and protective-decorative coatings of fasteners -, etc. (in the drawings and summary tables you can find both letter and numerical designations of the coating) - all the most common types of coatings are shown in the following table:

The name of the coating is placed after the dot, at the end of the designation of the fastener element. The number immediately after the coating designation indicates the thickness of the applied coating in microns, microns (1 micron = 1/1000 mm). If the coating is multilayer, then the total thickness of all layers of the coating is indicated.

How to determine coating parameters in a fastener designation

• Bolt M20-6gx80.58. 019 GOST 7798-70 - Bolt with plated number 01 (zinc, chromated - the most common coating is “galvanic galvanization”; it looks shiny white, sometimes with a yellowish or bluish tint) thickness 9 µm ;
• Nut M14-6N. 0522 GOST 5927-70 - Nut plated number 05 (chemical oxide, impregnated with oil - popularly called “oxidation”; outwardly looks black, shiny or matte) thickness 22 µm ;
• Oil can 1.2. Ts6 GOST 19853-74 - coated grease fitting C (zinc - also “galvanization”, also called “hot zinc” - according to the method of coating; visually differs from “galvanic galvanization” in the absence of pronounced shine and the visible structure of “flakes” on the surface of the coated part) thickness 6 µm ;
• Washer A.24.01.10kp. Kd6.hr GOST 11371-89 - Coated washer Kd.hr (cadmium, with chromating - what is called “cadmium plating”; looks yellow, with a rainbow sheen) thickness 6 microns ;
• Screw V.M5-6gx25.32. 1315 GOST 1491-80 - plated brass screw number 13 (nickel, simply called "nickel plated"; looks grayish-white with a slight shine) thickness 15 µm ;
• Washer 8.BrAMts9-2. M.N.H.b.32 GOST 6402-70 - bronze washer with multi-layer coating M.N.H.b (copper-nickel-chrome coating, or, more simply, “chrome-plated”; looks mirror-like, with a pronounced shine) total thickness 32 µm .