This standard specifies the method of indicating metal plating and chemical treatment. This standard applies to the indication of electroplating, chemical plating, chemical treatment and electrochemical treatment on metal and non-metal parts. GB/T 13911-1992 Method of indicating metal plating and chemical treatment GB/T13911-1992 standard download decompression password: www.bzxz.net
This standard specifies the method of indicating metal plating and chemical treatment. This standard applies to the indication of electroplating, chemical plating, chemical treatment and electrochemical treatment on metal and non-metal parts.

National Standard of the People's Republic of China
Methods for Expression of Metallic Coating and Chemical Treatment
Expression methods for metallic coating and chemical treatment 1 Subject content and scope of application
This standard specifies the methods for expression of metal plating and chemical treatment. GB/T13911-92
Replaces GB1238-76
This standard applies to the expression of electroplating, chemical plating, chemical treatment and electrochemical treatment on metal and non-metal parts. Note: When there are requirements for metal plating and chemical treatment that are not specified in this standard, they may be explained in the relevant technical documents. 2 Expression methods
2.1 Metal plating is expressed in the following order using the symbols specified in Chapter 3: Base material
Plating strength square teeth
Mirror layer name
Plating thickness
Plating layer characteristics
2.1.1 Base material may be omitted when it is clearly specified in the drawing or relevant technical documents. Post-treatment
2.1.2 When a coating is formed by multiple plating methods, if the plating method of a coating is different from the "plating method" marked on the far left, the plating method symbol and the spacing symbol "·" should be marked in front of the coating name. 2.1.3 When there is no specific requirement for the coating characteristics, coating thickness or post-treatment, it can be omitted. Example 1Fe/Ep·Cu10Ni15bCr0.3mc
(steel, electroplated copper 10μm or more, bright nickel 15μm or more, microcrack chromium 0.3μm or more) Example 2Fe/Ep·Zn7·c2C
(steel, electroplated zinc 7μm or more, rainbow chromate treatment 2nd level c type) Example 3Cu/Ep·Ni5bCr0.3r
(copper, electroplated bright nickel 5μm or more, ordinary chromium 0.3μm or more) Example 4Fe/Ep·Cu20Ap·Ni10Cr0.3cf (steel, electroplated copper 20μm or more, chemical nickel 10μm or more, electroplated crack-free chromium 0.3μm or more) Example 5PL/Ep·Cu10bNi15bCr0.3
(Plastic, electroplated bright copper 10μm or more, bright nickel 15um or more, common chromium 0.3μm or more. Common chromium symbol r is omitted)
2.2 Chemical treatment and electrochemical treatment are indicated by the symbols specified in Chapter 3 in the following order: Approved by the State Administration of Technical Supervision on December 1, 1992 and implemented on October 1, 1993
Base material
Treatment method
13911—92
Treatment name
Treatment characteristics
Base material can be omitted if it is clearly specified in the drawing or related technical documents. Post-treatment (whip color)
If there is no specific requirement for the treatment characteristics, post-treatment or color of chemical treatment or electrochemical treatment, it can be omitted. Example 1 AI/Et·A·CI(BK)
(aluminum, electrochemical treatment, anodizing, black coloring, no specific requirements for anodizing method) Example 2
Cu/Ct·P
(copper, chemical treatment, passivation)
Fe/Ct·MnPh
(steel, chemical treatment, manganese phosphate treatment) Al/Et·Ec
(aluminum, electrochemical treatment, electrolytic coloring) Symbols
3.1 Symbols for base materials
Metal materials are represented by chemical element symbols: alloy materials are represented by the chemical element symbols of their main components, and non-metal materials are represented by internationally accepted abbreviations. The symbols for commonly used base materials are shown in Table 1. Table 1
Material name
Iron, steel
Copper and copper alloys
Aluminum and aluminum alloys
Zinc and zinc alloys
Magnesium and magnesium alloys
Titanium and titanium alloys
Silicate materials (ceramics, glass, etc.)
Other non-metals
Symbols for plating methods and treatment methods
The symbols for plating methods and treatment methods are shown in Table 2. Method name
Electrochemical plating
Electrochemical treatment
Chemical treatment
Symbols for coating
electroplating
autocatalyticplating
electrochemicaltreatment
chemical treatment
GB/T13911—92
3.3.1 The name of the coating is represented by the chemical element symbol of the coating. 3.3.2 The name of the alloy coating is expressed by the symbols and contents of the chemical elements that make up the alloy. Alloy elements are connected by a hyphen "_". The alloy content is the upper limit of the mass percentage, expressed in Arabic numerals, written after the corresponding chemical element symbol, and enclosed in parentheses. The element components with higher content are listed first. Binary alloys are marked with the content of one element component, ternary alloys are marked with the content of two elements, and so on. When the content of the alloy component does not need to be indicated or is inconvenient to indicate, it is allowed not to be marked. Example 1Cu/Ep·Sn(60)-Pb15·Fm
(copper material, electroplated with tin-lead alloy containing 60% tin over 15um, hot melt) Example 2A1/Ep·Ni(80)-Co(20)-P3
(aluminum material, electroplated with nickel-cobalt-phosphorus alloy containing 80% nickel and 20% cobalt over 3μm) Example 3Cu/Ep·Au-Cu1~3
(copper material, electroplated with gold-copper alloy 13μm)
3.3.3 If it is necessary to indicate the metal purity of a certain metal coating, the mass percentage can be listed in brackets () after the element symbol of the metal, accurate to one decimal place.
Example Ti/Ep·Au(99.9)3
(Titanium material, electroplated gold with a purity of 99.9% and above 3μm) 3.3.4 When multi-layer plating is carried out, the name, thickness and characteristics of each layer shall be marked from left to right in the order of plating, and the width of a letter shall be left between the marks of each layer. It is also possible to mark only the name and total thickness of the last plated layer, and add parentheses to the name of the plated layer to distinguish it from the single-layer plated layer, but it must be specified or explained in the relevant technical documents. Example 1 See 2.1.3 Example 1, Example 3, Example 4, Example 5 Example 2 Fe/Ep·（Cr）25b
(Steel material, electroplated chromium on the surface, the combined plated layer is bright, the total thickness is above 25μm, and the intermediate plated layer shall be implemented in accordance with relevant regulations)
3.4 ​​Symbols for the thickness of the plated layer
The thickness of the plated layer is expressed in Arabic numerals in μm. The thickness number is marked after the name of the coating layer, and the value is the lower limit of the coating layer thickness range. If necessary, the coating thickness range can be marked. Example Cu/Ep·Ni5Aul~3
(copper material, electroplated nickel 5μm or more, gold 1~3μm) 3.5 The symbols for the names of chemical treatment and electrochemical treatment are shown in Table 3. Table 3
Treatment name
Electrolytic coloring
Manganese phosphate treatment
Phosphating phosphate treatment
Zinc phosphate treatment
Manganese zinc phosphate treatment
Calcium phosphate treatment
passivaing
oxidation
electrolytic colouring
manganese phosphate treatmentzinc phosphate treatment
manganese zinc phosphate treatmentzinc calcium phosphate Treatment symbol
MnZnPh
ZnCaPh
anodizing
treatment name
sulfuric acid anodizing
chromic acid anodizing
phosphoric acid anodizing
oxalic acid anodizing
13911—92
Continued Table 3
sulphuric acid anodizing
chromic acid anodizing
phosphoric acid anodizing
oxalic acid anodizing
Note: When there is no specific requirement for phosphating and anodizing, it is allowed to mark only Ph (symbol for phosphate treatment) or A (symbol for anodizing). See 2.2.2 for example.
Symbols for coating characteristics and treatment characteristics 3.6
The symbols for the characteristics of the coating layer and the processing characteristics are shown in Table 4. Table 4
Feature name
Semi-bright
Micro-crack
No crack
bright
semi-bright
doublelayer
regular')
micro-porous
micro-crack
crack-free
porous
patterns
blackening
opalescence
sealing
composition
hardness
porcelain
conduction
insulation
Note: 1) If there is no special requirement, it can be omitted, such as conventional chrome plating. 2) Refers to the coating obtained by dispersion plating, such as nickel sealing. Example
See Example 1, Example 3, and Example 5 in 2.1.3.
3.7 Symbols for post-treatment names
See Table 5 for symbols for post-treatment names. Www.bzxZ.net
Post-treatment names
Phosphating (phosphate treatment)
Anti-tarnish
Chromate sealing
See 2.2.2.
13911—92
passivation
phosphating (phosphate treatment) oxidation
emulsification
colouring
flashmelting
diffusion
painting
sealing
anti-tarnish
chromate sealing
symbols for chromate treatment after zinc and cadmium plating 3.8
symbols for chromate treatment after zinc and cadmium plating See Table 6. Table 6
Name of post-treatment
bright chromate treatment
bleaching chromate treatment
rainbow chromate treatment
dark chromate treatment
see Example 2 in 2.1.3.
Color Symbols
bright chromate treatment
blanching chromate treatment
iris chromate treatment
dark chromate treatment
4.1 The symbols for the commonly used colors of light metals and their alloys after electrochemical anodizing are shown in Table 7. Symbols
When light metals and their alloys are color-coded after electrochemical anodizing, the color codes shall be listed in the color-coding order and a "plus sign" (+) shall be inserted in the middle.
4.3 The color and luster of light metals and their alloys after electrochemical anodizing and the requirements for color-coding after electrochemical anodizing shall be based on the processed samples.
Letter code
Letter code
Gray (blue-gray)
The color letter code is marked in brackets (
See Example 1 in 2.2.2.
13911—92
) after the post-processing "coloring" symbol. AI/Et·A(s)·CI(BK+RD+GD)
(aluminum, electrochemical treatment, sulfuric acid anodizing, the color sequence is black, red, golden yellow). Independent processing procedure name symbol
Independent processing procedure name symbol See Table 8.
Organic solvent degreasing
Chemical degreasing
Electrolytic degreasing
Chemical pickling
Electrolytic pickling
Chemical alkali cleaning
Electrochemical polishing
Chemical polishing
Mechanical polishing
Vibration polishing
Fe/SD.
(Steel, organic solvent degreasing)
solvent degreasing
chemical degreasing
electrolytic degreasing
chemical pickling
electrolytic pickling
alkaline cleaing
electrochemical polishing
chemical polishing
mechanical polishing
sand blasting
shot blasting
barrel burnishing
brushing
grinding
blue (light blue)
purple (purple-red)
Additional instructions:
13911—92
This standard is proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Metal and Non-metallic Coverings. This standard was drafted by the Electronic Standardization Research Institute of the Ministry of Machinery and Electronics Industry, Factory No. 734, and Factory No. 761. The main drafters of this standard are Zhao Changchun, Luo Liming, and Liu Jikang.3 The color and coloring requirements of light metals and their alloys after electrochemical anodizing shall be based on the processed samples.
Letter code
Letter code
Gray (blue-gray)
The color letter code is marked in brackets (
See Example 1 in 2.2.2.
13911—92
) after the post-processing "coloring" symbol. AI/Et·A(s)·CI(BK+RD+GD)
(Aluminum, electrochemical treatment, sulfuric acid anodizing, the color sequence is black, red, and golden yellow). Symbols for the names of independent processing procedures
See Table 8 for the names of independent processing procedures.
Organic solvent degreasing
Chemical degreasing
Electrolytic degreasing
Chemical pickling
Electrolytic pickling
Chemical alkali cleaning
Electrochemical polishing
Chemical polishing
Mechanical polishing
Vibration polishing
Fe/SD.
(Steel, organic solvent degreasing)
solvent degreasing
chemical degreasing
electrolytic degreasing
chemical pickling
electrolytic pickling
alkaline cleaing
electrochemical polishing
chemical polishing
mechanical polishing
sand blasting
shot blasting
barrel burnishing
brushing
grinding
blue (light blue)
purple (purple-red)
Additional instructions:
13911—92
This standard is proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Metal and Non-metallic Coverings. This standard was drafted by the Electronic Standardization Research Institute of the Ministry of Machinery and Electronics Industry, Factory No. 734, and Factory No. 761. The main drafters of this standard are Zhao Changchun, Luo Liming, and Liu Jikang.3 The color and coloring requirements of light metals and their alloys after electrochemical anodizing shall be based on the processed samples.
Letter code
Letter code
Gray (blue-gray)
The color letter code is marked in brackets (
See Example 1 in 2.2.2.
13911—92
) after the post-processing "coloring" symbol. AI/Et·A(s)·CI(BK+RD+GD)
(Aluminum, electrochemical treatment, sulfuric acid anodizing, the color sequence is black, red, and golden yellow). Symbols for the names of independent processing procedures
See Table 8 for the names of independent processing procedures.
Organic solvent degreasing
Chemical degreasing
Electrolytic degreasing
Chemical pickling
Electrolytic pickling
Chemical alkali cleaning
Electrochemical polishing
Chemical polishing
Mechanical polishing
Vibration polishing
Fe/SD.
(Steel, organic solvent degreasing)
solvent degreasing
chemical degreasing
electrolytic degreasing
chemical pickling
electrolytic pickling
alkaline cleaing
electrochemical polishing
chemical polishing
mechanical polishing
sand blasting
shot blasting
barrel burnishing
brushing
grinding
blue (light blue)
purple (purple-red)
Additional instructions:
13911—92
This standard is proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Metal and Non-metallic Coverings. This standard was drafted by the Electronic Standardization Research Institute of the Ministry of Machinery and Electronics Industry, Factory No. 734, and Factory No. 761. The main drafters of this standard are Zhao Changchun, Luo Liming, and Liu Jikang.
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