Protective coatings. Symbols for types of fastener coatings. Oxidation of steel with oiling. type: chemical chem phos accelerated

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

You can learn more about corrosion from the movie:

Types and designation of coatings

There is quite a large number of coatings applied different ways for fasteners. All coatings can be divided into three types: protective, protective-decorative, decorative.

On the territory of the republics former USSR, in this moment, the following symbols for the types of protective and protective-decorative coatings of fasteners - , etc. (in the drawings and summary tables you can find both letter and numeric designation of the coating) - all the most common types of coatings are given 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 designation of the coating 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 define coverage parameters in a fastener symbol

• Bolt М20-6gх80.58. 019 GOST 7798-70 - Coated bolt number 01 thickness 9 µm ;
• Nut M14-6N. 0522 GOST 5927-70 - Coated nut number 05 (chemical oxide impregnated with oil - popularly called "oxidation"; outwardly looks black, glossy or matte) 22 µm ;
• Butter dish 1.2. C6 GOST 19853-74 - coated grease fitting C thickness 6 µm ;
• Washer A.24.01.10kp. Kd6.hr GOST 11371-89 - Coated washer Cd.chr (cadmium, chromated - what is called "cadmium"; looks yellow, with an iridescent sheen) 6 microns ;
• Screw B.M5-6gx25.32. 1315 GOST 1491-80 - plated brass screw number 13 (nickel, simply referred to as "nickel-plated"; looks off-white with a slight sheen) 15 µm ;
• Washer 8.BrAMts9-2. M.N.H.b.32 GOST 6402-70 - bronze washer with multi-layer coating M.N.H.b (plating copper-nickel-chrome, or, more simply, "chrome"; looks like a mirror, with a pronounced shine) total thickness 32 µm .

Indicators of material properties of products subjected to thermal or other types of processing are given in the technical requirements of the drawing.

If individual sections of the product are subjected to processing, then they are surrounded by a thickened dash-dotted line at a distance of 0.8 - 1 mm from the contour line and the indicators are put down on the shelf of the leader line drawn from the dash-dotted line. The values ​​of the properties of materials in this case indicate the limits (Figure 2.45)

The surface or section of the product, defined by the term or technical concept, is allowed not to be allocated, but to make an entry in the technical requirements by type ShankHDTVh 0,8…1, 48...52 HRFROM or SurfaceBUTHDTVh 0,8…1, 45...50 HRFROM. It is allowed to indicate on the drawing the types of processing if they are the only ones that guarantee the required properties (for example, cementing, nitriding, annealing, HDTV, etc.).

Figure 2.45

2.3.5 Designation of coatings and properties of materials

The designation of coatings of materials is applied on the drawings of products in accordance with GOST 2.310-68.

Paint coatings are designated according to GOST 9.032-74 and GOST 9.104-79.

The designation of the coating is given in the technical requirements of the drawing after the word Coating, then provide data on the coating materials (brand and designation of the standard or specifications) indicated in the designation. If the coating is not applied to the entire surface, then clarifications are made by type:

- Coatingoutdoorsurfaces…;

or the arrow indicates the surface and write:

- CoatingsurfacesBUT…;

- Coating…exceptsurfacesBUT.

Paint and varnish coatings (oil and enamel paints, as well as nitro enamels) are designated in the following order:

Designation of paintwork material according to GOST 9.074-77, GOST 9.401-89, GOST 9.404-81;

Coating class in terms of appearance (in ascending order of quality from I to VI);

Designation of operating conditions in terms of the impact of climatic factors and special environments (table 2.10 - 2.12).

Table 2.10 - Climatic version of products

Table 2.12 - Operating conditions

Designation of paintwork material, coating class and designation of operating conditions are separated by dots. Under the influence of various operating conditions, their designations are separated by a dash.

Examples of designations for paint and varnish coatings are shown in table 2 . 13.

The designation in the technical documentation of metallic and non-metallic inorganic coatings is regulated by GOST 9.306-85 .

The designation includes:

Designation of the coating method (table 2.18);

Coating material designation;

Minimum coating thickness, µm (up to 1 µm is not specified);

Designation of functional or decorative properties of coatings (if necessary);

Designations of additional processing (if necessary).

The coverage designation is recorded in 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 processing with a paint and varnish coating, which is separated by a fraction bar.

Table 2.13 - Designation of coatings

The designation of the coating method is given in Table 2.14.

Table 2.14 - Coating method

Non-metallic inorganic coating means:

Oxide - ox;

Phosphate - phosph.

Functional properties of the coating:

Solid (TV);

Electrical insulating (IEZ);

Conductive (e).

Decorative properties:

a) gloss: mirror (sq), shiny (b), matte (m);

b) roughness: smooth (hl), slightly rough (sh), rough (sh), very rough (sh);

c) patterning (rsch);

Additional coating treatment:

Oxidation (ox);

Reflow (opl);

Oil impregnation (prm);

Phosphating (phos);

Chromatization (xp), etc.

Examples of recording the designation of coatings are given in Table 2.15.

Table 2.15 - Designation of coatings

If the paint coating is preceded by a metallic or non-metallic inorganic coating, then the coatings are separated by a slash (fraction sign), for example: Kd6 / Enamel VL-515 red-brown. 515 class III, for operation when exposed to petroleum products.

Have questions? [email protected] // 8-912-044-66-44, 8-953-822-86-85

You can order chemical oxidation of steel according to GOST 9.305-84 by phone and e-mail specified in the "CONTACTS" section. To speed up the calculations, please use a special form for on-line order.

An example of the designation of chemical oxidation on steel with oiling: Chem.ox.prm

The coating thickness is not standardized and is usually 2-4 microns.

Coating warranty according to OST5 R.9048-96.Three-step quality control.

Description of coverage. Chemical blackening with oiling - the main coating for giving steel a black color with little or no change in size. At the same time with decorative trim steel is moderately protected from corrosion. In terms of protective ability, chemical oxidation surpasses simple passivation, but is inferior to phosphating, zinc plating and cathodic coatings (nickel, chromium, etc.). Black galvanizing is often used instead of chemical oxidation. No oiling or otherwise finishing oxidation is not applied, because. The coating contains a large number of pores in which pitting can develop.

Permissible operating temperature: up to +180 о С

Advantages of chemical oxidation of steel with oiling:

a) The Khim.Oks.prm coating is used to protect steel from corrosion under operating conditions. 1. When impregnated with oils or processed in emulsion mixtures, it has sufficiently high anti-corrosion characteristics and acceptable wear resistance compared to pure oxide.

b) In some cases, it can act as a primer for painting or for interoperational preservation of steel products.

in) Chemical blackening creates a highly decorative deep black color.

G) The process practically does not change the dimensions of the parts and does not affect physiochemical properties metal.

Disadvantages of chemical oxide coating of steel with oiling:

a) Black oxide film Has high porosity and low protective properties in the absence of impregnation with oils or emulsions.

b) Cannot be soldered or welded.

in) Possesses low resistance to wear and friction due to the small thickness of the oxide layer.

We accept orders for blackening as in the Sverdlovsk region (Ekaterinburg, Alapaevsk, Asbest, Berezovsky, Verkhnyaya Pyshma, Verkhoturye, Irbit, Kamensk-Uralsky, Kamyshlov, Krasnoturinsk, Krasnoufimsk, Nizhny Tagil, Novouralsk, Polevskoy, Revda, Rezh, Serov, Severouralsk and others ), and throughout the Urals and Russia (Chelyabinsk, Perm, Ufa, Tyumen, Kazan, Novosibirsk, Moscow and others).

Introduction date for newly developed products 01.01.87

for products in production - when reviewing technical documentation

This International Standard specifies the designations for metallic and non-metallic inorganic coatings in technical documentation.

1. The designations of the methods of processing the base metal are given in table. one.

Table 1

2. The designations of the methods for obtaining the coating are given in table. 2.

table 2

* The method of obtaining coatings, painted in the process of anodic oxidation of aluminum and its alloys, magnesium and its alloys, titanium alloys, is designated "Anotsvet".

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

table 2

3. 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.

The designations of the coating material, consisting of metal, are given in Table. 3.

Table 3

4. Designations for nickel and chromium coatings are given in the mandatory.

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

In the designation of the coating material with an alloy, if necessary, it is allowed to indicate the minimum and maximum mass fractions of the components, for example, gold-nickel alloy 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 with alloys based on precious metals of watch parts and jewelry, it is allowed to indicate the average mass fraction of the components.

For newly developed alloys, the designation of the components is carried out in order of decreasing their mass fraction.

6. Designations of coatings with alloys are given in Table. four.

Table 4

Table 4 (Revised edition, Rev. No. 3).

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

8. In the designation of the hot solder coating, indicate the brand of solder according to GOST 21930-76, GOST 21931-76.

9. Designations of non-metallic inorganic coatings are given in table. 5.

Table 5

10. 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 , .

Electrolytes (solutions) not listed in the annexes are designated by their full name, for example, Ts9. ammonium chloride. xp, M15. pyrophosphate.

11. Designations of functional properties of coatings are given in Table. 6.

Table 6

12. Notation decorative properties coatings are given in table. 7.

Table 7

* 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 colored.

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

13. Notation additional processing coatings are given in table. eight.

Table 8

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

14. The designation of additional processing of the coating by impregnation, hydrophobization, application of paintwork may be replaced by the designation of the brand of material used for additional processing.

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

The designation of a specific paintwork used as an additional treatment is made in accordance with GOST 9.032-74.

15. Production methods, coating material, electrolyte (solution) designation, 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.

(Revised edition, Rev. No. 2).

16. The order of designation of the coating in the technical documentation:

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

designation of the method of obtaining the coating;

designation of the coating material;

minimum coating thickness;

designation of the electrolyte (solution) from which the coating is to be obtained (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, in the designation of the coating, it is allowed to indicate the minimum and maximum thicknesses through a hyphen.

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

(Revised edition, Rev. No. 2).

17. The coating thickness equal to or less than 1 micron is not indicated in the designation, unless there is a technical need (with the exception of precious metals).

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

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

20. Recording of the designation of the coating is carried out in 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 processing with a paint and varnish coating, which is separated from the designation of a metallic or non-metallic inorganic coating by a shot line.

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

Examples of recording the designation of coatings are given in.

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

21. The procedure for designating coatings according to international standards is given in.

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

ATTACHMENT 1

Mandatory

DESIGNATIONS FOR NICKEL AND CHROME PLATES

* If necessary, the technical requirements of the drawing indicate the symbol chemical element or the formula of the chemical compound used as the precipitated substance.

Note . It is allowed to use abbreviations and indicate the total thickness of the coating.

(Revised edition, Rev. No. 2).

APPENDIX 2

Mandatory

DESIGNATIONS OF ELECTROLYTES FOR OBTAINING COATINGS

APPENDIX 3

Mandatory

DESIGNATIONS OF SOLUTIONS FOR OBTAINING COATINGS

(Revised edition, Rev. No. 1).

APPENDIX 4

Mandatory

EXAMPLES OF RECORDING DESIGNATIONS OF COATINGS

APPENDIX 5

Reference

DESIGNATION OF COATINGS ACCORDING TO INTERNATIONAL STANDARDS

1. The material of the base metal and coating is designated by the chemical symbol of the element.

The base metal material, consisting of an alloy, is designated by the chemical symbol of the element with the maximum mass fraction. The main non-metallic material is designated NM, plastic - PL.

The coating material, consisting of an alloy, is designated by the chemical symbols of the components included in the alloy, separating them with a hyphen. The maximum mass fraction of the first component is indicated after the chemical symbol of the first component before the hyphen.

2. The designation of methods for obtaining a coating is given in table. 9.

Table 9

3. Designations of additional processing of a covering are resulted in tab. ten.

Table 10

* The color of the chromate film is indicated by:

A - colorless with a bluish tint; B - colorless with an iridescent tint; C - yellow, rainbow; D - olive (khaki).

Coatings A and B belong to the 1st class of chromate coatings, coatings C and D , which have a higher corrosion resistance, belong to the 2nd class.

4. The designation of the types of nickel and chromium coatings are given in Table. eleven.

Table 11

5. The designation is written on a line in the following order:

the chemical symbol of the base metal or the designation of the non-metal, followed by a slash;

a coating method in which the chemical symbol of the sublayer metal is indicated;

chemical symbol of the coating metal (if necessary, in parentheses indicate the purity of the metal as a percentage);

a figure expressing the minimum thickness of the coating on working surface in microns;

coating type designation (if necessary);

designation of additional processing and class (if necessary).

Examples of designations are given in Table. 12.

Table 12

Annex 5 Added additionally (Amendment No. 3).

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Academy of the Lithuanian SSR

DEVELOPERS

E.B. Davidavichus, cand. chem. sciences; G.V. Kozlova, cand. tech. sciences (topic leaders); E.B. Romashkene, cand. chem. sciences; T.I. Berezhnyak; A.I. Volkov, cand. tech. sciences; T.A. Karmanova

2. APPROVED AND INTRODUCED BY Decree State Committee USSR according to the standards of 01.24.85 No. 164

3. The term of the first check is 1992; inspection frequency - 5 years

4. Instead of GOST 9.037-77; GOST 21484-76

5. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS

6. REPUBLICATION with Amendments No. 1, 2, approved in October 1985, February 1987 (IUS 1-86, 5-87)

Introduction date for newly developed products 01.01.87

Table 1

table 2

Table 3

Table 4

Table 5

Table 6

Table 7

Table 8

ATTACHMENT 1

Mandatory

DESIGNATIONS FOR NICKEL AND CHROME PLATES

APPENDIX 2

Mandatory

DESIGNATIONS OF ELECTROLYTES FOR OBTAINING COATINGS

APPENDIX 3

Mandatory

DESIGNATIONS OF SOLUTIONS FOR OBTAINING COATINGS

APPENDIX 4

Mandatory

EXAMPLES OF RECORDING DESIGNATIONS OF COATINGS

APPENDIX 5

Reference

DESIGNATION OF COATINGS ACCORDING TO INTERNATIONAL STANDARDS

1. The base metal material and coatings are designated by the chemical symbol of the element. The base metal material, consisting of an alloy, is designated by the chemical symbol of the element with the maximum mass fraction. The main non-metallic material is designated NM, plastic - PL. The coating material, consisting of an alloy, is designated by the chemical symbols of the components included in the alloy, separating them with a hyphen. The maximum mass fraction of the first component is indicated after the chemical symbol of the first component before the hyphen.2. The designation of methods for obtaining a coating is given in table. 9.

Table 9

Table 10

Table 11

Table 12

INFORMATION DATA

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