This standard specifies the identification method of metal plating and chemical treatment. This standard is applicable to the identification of electroplating, chemical plating and chemical treatment on metal and non-metal parts. The identification method of chemical treatment on the surface of aluminum and aluminum alloys can refer to the general identification method specified in this standard. This standard is a revision of GB/T13911-1992. Compared with GB/T13911-1992 "Methods of Representation of Metal Plating and Chemical Treatment", the main technical content has the following changes: - In accordance with international standards and Chinese standard practices, the standard name "Methods of Representation of Metal Plating and Chemical Treatment" is changed to "Methods of Identification of Metal Plating and Chemical Treatment"; - In accordance with the requirements of GB/T1.1-2000, the foreword is added; - The scope of application is modified, and this standard is not applicable to the identification of chemical treatment of aluminum and aluminum alloys; - The reference standard part is added; - The application examples in the original standard are modified, and the example description of the current standard is adopted; - According to the scope of plating application, the content of chemical treatment of aluminum and aluminum alloy anodizing is deleted. GB/T 13911-2008 Methods for marking metal plating and chemical treatment GB/T13911-2008 Standard download decompression password: www.bzxz.net
This standard specifies the marking method for metal plating and chemical treatment. This standard applies to the marking of electroplating, chemical plating and chemical treatment on metal and non-metal parts. The marking method for chemical treatment of aluminum and aluminum alloy surface can refer to the general marking method specified in this standard.
This standard is a revision of GB/T13911-1992. The main technical contents have been changed as follows compared with GB/T13911-1992 "Methods of Metal Plating and Chemical Treatment Indication": --- In accordance with international standards and Chinese standard practices, the standard name "Methods of Metal Plating and Chemical Treatment Indication" is changed to "Methods of Metal Plating and Chemical Treatment Identification"; --- The foreword is added according to the requirements of GB/T1.1-2000; --- The scope of application is modified. This standard is not applicable to the identification of chemical treatment of aluminum and aluminum alloys;
--- The referenced standards are added; --- The application examples in the original standard are modified, and the example descriptions of the current standards are adopted; --- According to the scope of plating application, the content of anodizing chemical treatment of aluminum and aluminum alloys is deleted. This standard is proposed by China Machinery Industry Federation. This standard is under the jurisdiction of National Technical Committee for Standardization of Metallic and Non-metallic Coatings (SAC/TC57). The drafting unit of this standard: Wuhan Institute of Material Protection. The main drafters of this standard: Jia Jianxin, Mao Zuguo, Zhang Dezhong, He Jie, Deng Rizhi. The previous versions of the standards replaced by this standard are: ---GB/T13911-1992. The clauses in the following documents become the clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties to the agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version shall apply to this standard. GB/T3138 Metal coating and chemical treatment and related process terms (GB/T3138-1995, neqISO2079:1981) GB/T9797 Metal coatings Nickel + chromium and copper + nickel + chromium electroplated layers (GB/T9797-2005, ISO1456:2003, IDT) GB/T9798 Metal coatings Nickel electrodeposited layers (GB/T9798-2005, ISO1458:2002, IDT) GB/T9799 Metal coatings Zinc electroplated layers on steel (GB/T9799-1997, eqvISO2081:1986) GB/T11379 Metallic coatings - Chromium electroplating for engineering purposes (GB/T11379-2008, ISO6158:2004, IDT) GB/T12332 Metallic coatings - Nickel electroplating for engineering purposes (GB/T12332-2008, ISO4526:2004, IDT) GB/T12599 Technical specification and test method for tin electroplating of metallic coatings (GB/T12599-2002, ISO2093:1986, MOD) GB/T12600 Nickel + chromium electroplating on metallic coatings plastics (GB/T12600-2005, ISO4525:2003, IDT) GB/T13913 Metallic coatings Specifications and test methods for chemically plated (autocatalytic) nickel-phosphorus alloy coatings (GB/T13913-2008, ISO4527:2003, IDT) GB/T13346 Metallic coatings Cadmium coatings on iron and steel (GB/T13346-1992, idtISO2082:1986) GB/T17461 Metallic coatings Tin-lead alloy coatings (GB/T17461-1998, eqvISO7587:1986) GB/T17462 Metallic coatings Tin-nickel alloy coatings (GB/T17462-1998, eqvISO2179:1986) ISO4521 Metallic coatings Silver and silver alloy coatings for engineering use ISO4523 Metallic coatings - Electroplated gold and gold alloy coatings for engineering purposes Foreword I 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Methods for identifying metal coatings and chemical treatments 1 5 Examples of identification of typical coatings 3

ICS25.220.40
National Standard of the People's Republic of China
GB/T13911--2008
Replaces GB/T13911-1992
Designation for metallic coating and chemical treatment treatment2008-07-01issued
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of ChinaStandardization Administration of the People's Republic of China
2009-02-01implemented
GB/T13911—2008
Normative references
Terms and definitions
Metal plating and chemical treatment identification methods
Typical coating identification examples
GB/T13911—2008
This standard is a revision of GB/T13911--1992. The main technical contents are consistent with GB/ Compared with T13911-1992 "Methods for the Representation of Metal Coating and Chemical Treatment", the following changes have been made: in accordance with international standards and Chinese standard practices, the standard name "Methods for the Representation of Metal Coating and Chemical Treatment" has been changed to "Methods for the Identification of Metal Coating and Chemical Treatment";
In accordance with the requirements of GB/T1.1-2000, the foreword has been added; the scope of application has been modified, and this standard is not applicable to the identification of chemical treatment of aluminum and aluminum alloys; the reference standard part has been added;
The application examples in the original standard have been modified, and the example description of the current standard has been adopted: according to the scope of plating application, the content of anodizing chemical treatment of aluminum and aluminum alloys has been deleted. This standard is proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Technical Committee for Standardization of Metal and Non-metallic Coatings (SAC/TC57). The drafting unit of this standard: Wuhan Institute of Materials Protection. The main drafters of this standard: Jia Jianxin, Mao Zuguo, Zhang Dezhong, He Jie, Deng Rizhi. The previous versions of the standards replaced by this standard are: -GB/T13911-1992.
1 Scope
Metal plating and chemical treatment identification method
This standard specifies the identification method of metal plating and chemical treatment. This standard applies to the identification of electroplating, chemical plating and chemical treatment on metal and non-metal parts. The identification method of chemical treatment on the surface of aluminum and aluminum alloys can refer to the general identification method specified in this standard. GB/T13911—2008
Note: When there are requirements for metal plating and chemical treatment that are not specified in this standard, it is allowed to be explained in the relevant technical documents. 2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For all dated referenced documents, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties to the agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all undated referenced documents, the latest versions are applicable to this standard. GB/T3138 Metal coating and chemical treatment and related process terms (GB/T3138-1995, neqISO2079:1981) GB/T9797
Metallic covering
GB/T9798
Metallic covering
GB/T9799
GB/T11379
GB/T12 332
GB/T12599
1986,MOD)
GB/T12600
GB/T13913
Metallic covering
Metallic covering
Metallic covering
Metallic covering
Metallic covering
Metallic covering
2008,I ISO4527:2003, IDT)
GB/T13346
GB/T17461
GB/T17462
Metallic covering
Metallic covering
Metallic covering
Nickel + chromium and copper + nickel + chromium electroplating layer (GB/T97972005, ISO1456:2003, IDT)
GB/T13346
GB/T17461
GB/T17462
Metallic covering
Metallic covering
Nickel + chromium and copper + nickel + chromium electroplating layer (GB/T97972005, ISO1456:2003, IDT) DT) Nickel electrodeposition layer (GB/T9798-2005, ISO1458:2002.IDT) Zinc electroplating layer on steel (GB/T9799-1997, eqvISO2081:1986) Engineering chromium electroplating layer (GB/T11379--2008ISO6158:2004, IDT) Engineering nickel electroplating layer (GB/T12332--2008 , ISO4526:2004, IDT) Technical specifications and test methods for tin electroplating (GB/T12599-2002, ISO2093 Nickel electroplating on plastics (GB/T12600--2005, ISO4525:2003, IDT) Specifications and test methods for chemical (self-catalytic) nickel-phosphorus alloy coatings (GB/T13913 Electroplating on steel (GB/T13346-1992, idtISO2082:1986) Tin-lead alloy electroplating (GB/T17461-1998, eqvISO7587:1986) Tin-nickel alloy electroplating (GB/T17462--1998.egvISO2179:1986) ISO4521 Metal covering
Silver and silver alloy electroplating for engineering ||tt ||ISO4523
Gold and gold alloy electroplating for engineering
Metal coating
3 Terms and definitions
The terms and definitions established in GB/T3138 apply to this standard. 4 Identification methods for metal plating and chemical treatment
4.1 The identification of metal plating and chemical treatment usually consists of four parts: Part 1 includes the plating method, which is an essential element of the component identification; Part 2 includes the implementation standards and base materials, which are essential elements of the component identification; Part 3 includes the coating material, coating requirements and coating characteristics, which constitute the main process characteristics of the coating, and the identification of the component changes with the process characteristics;
Part 4 includes a detailed description of each part, such as the chemical treatment method, stress relief requirements and alloy element marking. This part is an optional element of the component identification (see Chapter 5). 1
GB/T13911—2008
General identification of metal plating and chemical post-treatment is shown in Table 1. Table 1 General identification of single metal and multi-layer plating and chemical post-treatment Basic information
Note: Typical identification example, electroplating layer GB/T9797-Fe/Cu20aNi30bCrmc (see 5.1). Explanation of plating identification sequence:
Plating methods should be expressed in Chinese. For ease of use, Chinese is often used: electroplating, chemical plating, mechanical plating, brush plating, vapor deposition, etc.
This standard number is the national standard number or industry standard number implemented by the corresponding coating layer; if the national or industry standard is not implemented, b)
the enterprise standard number of the product should be marked, and it should be noted that the standard is the enterprise standard. Products without standard numbers are not allowed; a short horizontal bar "_" is connected after the standard number,
the base material is represented by a symbol, see Table 2 for the commonly used base material symbols, and the plating of alloy materials must also be marked if necessary d)
the alloy element composition and content;
the base material is separated by a slash "/\";
When a bottom coating is required, the bottom coating material and the minimum thickness (in um) should be marked. When there are requirements for the bottom coating characteristics, the bottom coating characteristic symbol should be indicated according to the typical identification (see Chapter 5). If there are no characteristic requirements, it means that there are no special requirements for the coating, and it is allowed Omit the bottom coating characteristic symbol. For alloy materials, the alloy element composition and content must be marked when necessary. If the bottom coating is not required, no marking is required;
When a middle coating is required, the middle coating material and minimum thickness (in m) should be marked. When the middle coating characteristics have requirements, the middle coating characteristic symbol should be indicated according to the typical g)
marking (see Chapter 5). If there are no characteristic requirements, it means that there are no special requirements for the coating, and the middle coating characteristic symbol can be omitted. For alloy materials, the alloy element composition and content must be marked when necessary. If the middle coating is not required, no marking is required:
The surface coating material and minimum thickness mark should be marked. When the surface coating characteristics have requirements, the typical marking (see Chapter 5) should be indicated. h)
The surface coating characteristic symbol. For alloy materials, the alloy element composition and content must be marked when necessary. If the middle coating is not required, no marking is required:
The surface coating material and minimum thickness mark should be marked. When the surface coating characteristics have requirements, the typical marking (see Chapter 5) should be indicated. h)
The surface coating characteristic symbol. Alloy element composition and content. If there is no characteristic requirement, it means that there is no special requirement for the coating, and the coating characteristic symbol should be omitted; the post-treatment of the coating is chemical treatment, electrochemical treatment and heat treatment. The marking method can be found in the typical marking regulations (see Chapter 5). i)
j) The alloy coating material identification shall be marked when necessary. The binary alloy coating shall indicate the main element content in brackets after the main element, and connect the secondary element with a horizontal bar, such as: Sn (60)-Pb represents tin-lead alloy coating, in which the tin mass content is 60%; when the alloy component content does not need to be marked or is inconvenient to mark, it is allowed not to mark. For ternary alloys, the content of two elements is marked, and so on.
4.2 Common symbols for metal plating methods and chemical treatment Metal materials are represented by chemical element symbols, and alloy materials are represented by the chemical element symbols of their main components. , non-metallic materials are represented by internationally accepted abbreviations. The symbols for commonly used base materials are shown in Table 2. Table 2 Symbols for commonly used base materials
Material name
Iron, steel
Copper and copper alloys
Aluminum and aluminum alloys
Material name
Zinc and zinc alloys
Magnesium and magnesium alloys
Titanium and titanium alloys
Other non-metals
Examples of typical coating identification
Table 2 (continued)
5.1 Identifiers for nickel + chromium and copper + nickel + chromium electroplated layers on metal substrates
GB/T13911—2008
(Element symbols or English abbreviations of common names are preferred) The identification of nickel + chromium and copper + nickel + chromium electroplated layers on metal substrates shall refer to the identification provisions of GB/T9797. See Table 3 for the characteristic identification of the coating. The typical identification examples are as follows. For the non-typical identification, see GB/T9797: Example 1: Electroplated layer GB/T9797-Fe/Cu20aNi30bCrmc This coating identification indicates that 20μm extended and leveled copper + 30μm bright nickel + 0.3μm micro-cracked chromium is plated on a steel substrate.
Example 2. Electroplated layer GB/T9797-Zn/Cu20aNi20bCrmc This coating identification indicates that 20μm extended and leveled copper + 20μm bright nickel + 0.3μm micro-cracked chromium is plated on a zinc alloy substrate.
Example 3: Electroplating layer GB/T9797-Cu/Ni25bCrmp This plating mark indicates that 25μm semi-bright nickel plus 0.3μm microporous chromium is plated on a copper alloy substrate. Example 4: Electroplating layer GB/T9797-AI/Ni20sCrI This plating mark indicates that 20μm satin nickel plus 0.3μm conventional chromium is plated on an aluminum alloy substrate. Table 3 Characteristic symbols of copper, nickel and chromium plating
Type of plating
Copper ammonium layer
Nickel plating
Chromium plating
Plating characteristics
Indicates plated extended and leveled copper
Indicates full bright nickel
Indicates mechanically polished dark nickel or semi-bright nickelIndicates non-machine-polished dark nickel, semi-bright nickel or satin nickelIndicates double-layer or triple-layer nickel
Indicates ordinary chromium (i.e. conventional chromium)
Indicates microcrack chromium
Indicates microporous chromium
Note: mc microcrack chromium, the conventional thickness is 0.3μm. Some special processes require thicker chromium plating (about 0.8μm). In this case, the coating identification shall include the minimum local thickness, such as: Crmc (0.8) 5.2 Nickel + chromium electroplating identification on plastics
The identification of nickel + chromium and copper + nickel + chromium electroplating on plastics shall refer to the provisions of GB/T12600, and the identification of coating characteristics shall refer to Table 3. The identification examples and explanations are as follows:
Example 1: Electroplating layer GB/T12600-PL/Cu15aNi10bCrmp (or mc) This coating identification indicates that the plastic substrate is plated with 15μm extended and leveled copper + 10μm bright nickel + 0.3μm microporous or microcracked chromium.
Example 2: Electroplating layer GB/T12600-PL/Ni20dpNi20dCrmp3
GB/T13911—2008
This plating mark indicates that the plating layer is 20μm extended nickel + 20μm double-layer nickel + 0.3μm microporous chromium plated on a plastic substrate. Note: dp indicates that the ductile columnar nickel plating layer is electroplated from a special pre-plating solution. 5.3 Marking of decorative nickel, copper and nickel electroplating layers on metal substrates The marking of nickel and copper and nickel electroplating layers on metal substrates shall refer to the provisions of GB/T9798 marking, and the marking of plating characteristics shall refer to Table 3. The marking examples and explanations are as follows:
Example 1: Electroplating layer GB/T9798-Fe/Cu20aNi25s This plating mark indicates that the plating layer is 20um extended and leveled copper + 25um satin nickel plated on a steel substrate. Example 2: Electroplating layer GB/T9798-Fe/Ni30p. This plating mark indicates that the electroplating layer is plated with 30μm semi-bright nickel on the steel substrate. Example 3: Electroplating layer GB/T9798-Zn/Cu10aNi15b. This plating mark indicates that the electroplating layer is plated with 10μm extended and leveled copper and 15μm full-bright nickel on the zinc alloy substrate. Example 4: Electroplating layer GB/T9798-Cu/Ni10b. This plating mark indicates that the electroplating layer is plated with 10μm full-bright nickel on the copper alloy substrate. Example 5: Electroplating layer GB/T9798-A1/Ni25b. This plating mark indicates that the electroplating layer is plated with 25μm full-bright nickel on the aluminum alloy substrate. 5.4 Labeling of zinc and cadmium electroplating layers on steel The labeling of zinc and cadmium electroplating layers on steel substrates shall refer to the labeling provisions of GB/T9799 and GB/T13346. The relevant electroplated zinc, electroplated layer chemical treatment and classification symbols in the labeling are shown in Table 4. Labeling examples and explanations are as follows: Example 1: Electroplated layer GB/T9799-Fe/Zn25clA This labeling indicates that the electroplated zinc layer on the steel substrate is at least 25μm, and the coating is treated with rainbow chromate after electroplating. Example 2: Electroplated layer GB/T13346-Fe/Cd8c2C This labeling indicates that the electroplated cadmium layer on the steel substrate is at least 8μm, and the coating is treated with rainbow chromate after electroplating. Table 4 Symbols for chromate treatment after zinc and cadmium plating Post-treatment name
Bright chromate treatment
Bleach chromate treatment
Rainbow chromate treatment
Deep treatment
5.5 Identification of engineering chromium electroplating layer
The identification of engineering chromium electroplating layer shall be as specified in GB/T11379. The characteristic symbols of engineering chromium plating layer in the identification are shown in Table 5. In order to ensure good bonding between the plating layer and the base metal, engineering chromium sometimes needs heat treatment before and after plating. The characteristic symbols of plating heat treatment are shown in Table 6, and the heat treatment characteristic identification is shown in GB/T11379. The identification examples and explanations are as follows: Example 1: Electroplating layer GB/T11379-Fe//Cr50hr This identification indicates the identification of conventional hard chromium (Cr50hr) electroplating layer with a thickness of 50μm directly electroplated on a low-carbon steel substrate. Example 2: Electroplating layer GB/T11379-AI//Cr250hp This identification indicates the identification of porous chromium electroplating layer with a thickness of 250μm directly electroplated on an aluminum alloy substrate. Example 3: Electroplating layer GB/T11379-Fe//Ni10sf/Cr25ht This symbol indicates that the bottom coating layer is 10μm thick sulfur-free nickel + 25μm conventional hard chromium coating on the steel substrate. Example 4: Electroplating layer GB/T11379-Fe/[SR(210)2]/Cr50hr/[ER(210)22) This symbol indicates that the conventional hard chromium coating layer with a thickness of 50μm is electroplated on the steel substrate, and the stress relief heat treatment is carried out at 210℃ for 2h before electroplating, and the brittleness reduction heat treatment is carried out at 210℃ for 22h after electroplating. Note 1: The symbols of chromium coating, top coating and bottom coating are separated by slashes (/) according to the order of coating. The coating identification should include the coating thickness (in micrometers) and the heat treatment requirements. Steps that are not required between processes should be marked with double slashes (//). Note 2: Heat treatment characteristic mark of the coating, for example: [SR(210)1] means stress relief treatment at 210℃ for 1h. 4
Table 5 Characteristic symbols of chromium electroplating for engineering use
Characteristics of chromium electroplating
Conventional hard chromium
Hard chromium bonded in mixed acid
Microcracked hard chromium
Microporous hard chromium
Double-layer chromium
Special types of chromium
Table 6 Characteristic symbols of heat treatment
Heat treatment characteristics
Indicates stress relief heat treatment
Indicates heat treatment to reduce hydrogen embrittlement sensitivity
Indicates other heat treatment
5.6 Identification of nickel electroplating for engineering use
GB/T13911—2008
For the identification of nickel electroplating for engineering use, please refer to the provisions of GB/T12332. The type, sulfur content and ductility of the engineering nickel plating in the identification are shown in Table 7. In order to ensure good bonding between the plating and the base metal, engineering nickel sometimes needs heat treatment before and after plating. The characteristic symbols of the plating heat treatment are shown in Table 6. The identification examples and explanations are as follows: Example 1 Electroplating layer GB/T12332-Fe//Ni50sf This identification indicates that the minimum local thickness of the electroplated engineering nickel plating layer on the carbon steel substrate is 50μm and sulfur-free. Example 2: Electroplating layer GB/T12332-A1//Ni75pd This identification indicates that the minimum local thickness of the electroplated engineering nickel plating layer on the aluminum alloy substrate is 75um, sulfur-free, and the nickel layer contains co-deposited silicon carbide particles.
Example 3: Electroplated layer GB/T12332-Fe/[SR(210)2]/Ni25sf/[ER(210)22] This symbol indicates that the minimum local thickness of the electroplated nickel electroplated layer on the high-strength steel substrate is 25μm and sulfur-free. Before electroplating, it is subjected to stress relief heat treatment at 210℃ for 2h, and after electroplating, it is subjected to brittleness reduction heat treatment at 210℃ for 22h. Note: The symbols of nickel or nickel alloy coating, bottom coating and surface coating are separated by slashes (/) according to the order of coating. The coating identification should include the coating thickness in microns and the heat treatment requirements. Steps that are not required between processes should be marked with double slashes (//). Table 7 Symbols, sulfur content and ductility of different types of nickel electroplating layers Type of electroplating layer
Sulfur-free nickel with particles dispersed in nickel mother solution
5.7 Identification of chemically plated (autocatalytic) nickel-phosphorus alloy coating Sulfur content (mass fraction)/%
Ductility/%
The quality of chemically plated nickel-phosphorus coating is closely related to the characteristics of the base metal, the coating and heat treatment conditions (see the instructions and regulations of GB/T13913). Therefore, the identification of chemically plated nickel-phosphorus coating includes the general identification specified in 4.1, and if necessary, it should also include the identification of special alloys of the base metal, the requirements for relieving internal stress of the base and coating, and the phosphorus content in the chemically plated nickel-phosphorus coating. Double slashes (//) will be used to indicate that a step or operation is not listed or omitted. Chemically plated nickel-phosphorus coatings should be identified by the symbol NiP, and the value of the phosphorus content of the coating should be filled in the parentheses immediately following it, and then the minimum local thickness of the chemically plated nickel-phosphorus coating should be marked thereafter, in μm. 5
GB/T13911—2008
Typical identification examples are as follows. For identification of atypical chemical plating, please refer to GB/T13913. Example 1: Chemical nickel-phosphorus plating GB/T13913-Fe<16Mn>[SR(210)22]/NiP(10)15/Cr0.5[ER(210)22] This identification indicates that a nickel-phosphorus plating layer with a phosphorus content of 10% (mass fraction) and a thickness of 15μm is chemically plated on a 16Mn steel substrate. Before chemical plating, a stress relief heat treatment at 210℃ for 22h is required. After chemical nickel plating, 0.5μm thick chromium is electroplated on its surface. Finally, a heat treatment at 210℃ for 22h is performed to eliminate hydrogen embrittlement. Example 2: Chemical nickel-phosphorus plating GB/T13913-Al<2B12>//NiP(10)15/Cr0.5//This mark indicates that the same plating as in Example 1 is plated on the aluminum alloy substrate and no heat treatment is required. Example 3: Chemical nickel-phosphorus plating GB/T13913-Cu6 Nickel electroplating layer identification for engineering use
GB/T13911—2008
The identification of nickel electroplating layer for engineering use shall be as specified in GB/T12332. The identification of the type, sulfur content and ductility of the engineering nickel plating layer in the identification is shown in Table 7. In order to ensure good bonding between the plating layer and the base metal, engineering nickel sometimes needs heat treatment before and after plating. The characteristic symbols of the plating heat treatment are shown in Table 6. The identification examples and explanations are as follows: Example 1 Electroplating layer GB/T12332-Fe//Ni50sf This identification indicates the identification of the engineering nickel electroplating layer with a minimum local thickness of 50μm and no sulfur electroplated on a carbon steel substrate. Example 2: Electroplating layer GB/T12332-A1//Ni75pd This identification indicates the identification of the engineering nickel electroplating layer with a minimum local thickness of 75um, no sulfur electroplated on an aluminum alloy substrate, and the nickel layer contains co-deposited silicon carbide particles.
Example 3: Electroplated layer GB/T12332-Fe/[SR(210)2]/Ni25sf/[ER(210)22] This symbol indicates that the minimum local thickness of the electroplated nickel electroplated layer on the high-strength steel substrate is 25μm and sulfur-free. Before electroplating, it is subjected to stress relief heat treatment at 210℃ for 2h, and after electroplating, it is subjected to brittleness reduction heat treatment at 210℃ for 22h. Note: The symbols of nickel or nickel alloy coating, bottom coating and surface coating are separated by slashes (/) according to the order of coating. The coating identification should include the coating thickness in microns and the heat treatment requirements. Steps that are not required between processes should be marked with double slashes (//). Table 7 Symbols, sulfur content and ductility of different types of nickel electroplating layers Type of electroplating layer
Sulfur-free nickel with particles dispersed in nickel mother solution
5.7 Identification of chemically plated (autocatalytic) nickel-phosphorus alloy coating Sulfur content (mass fraction)/%www.bzxz.net
Ductility/%
The quality of chemically plated nickel-phosphorus coating is closely related to the characteristics of the base metal, the coating and heat treatment conditions (see the instructions and regulations of GB/T13913). Therefore, the identification of chemically plated nickel-phosphorus coating includes the general identification specified in 4.1, and if necessary, it should also include the identification of special alloys of the base metal, the requirements for relieving internal stress of the base and coating, and the phosphorus content in the chemically plated nickel-phosphorus coating. Double slashes (//) will be used to indicate that a step or operation is not listed or omitted. Chemically plated nickel-phosphorus coatings should be identified by the symbol NiP, and the value of the phosphorus content of the coating should be filled in the parentheses immediately following it, and then the minimum local thickness of the chemically plated nickel-phosphorus coating should be marked thereafter, in μm. 5
GB/T13911—2008
Typical identification examples are as follows. For identification of atypical chemical plating, please refer to GB/T13913. Example 1: Chemical nickel-phosphorus plating GB/T13913-Fe<16Mn>[SR(210)22]/NiP(10)15/Cr0.5[ER(210)22] This identification indicates that a nickel-phosphorus plating layer with a phosphorus content of 10% (mass fraction) and a thickness of 15μm is chemically plated on a 16Mn steel substrate. Before chemical plating, a stress relief heat treatment at 210℃ for 22h is required. After chemical nickel plating, 0.5μm thick chromium is electroplated on its surface. Finally, a heat treatment at 210℃ for 22h is performed to eliminate hydrogen embrittlement. Example 2: Chemical nickel-phosphorus plating GB/T13913-Al<2B12>//NiP(10)15/Cr0.5//This mark indicates that the same plating as in Example 1 is plated on the aluminum alloy substrate and no heat treatment is required. Example 3: Chemical nickel-phosphorus plating GB/T13913-Cu6 Nickel electroplating layer identification for engineering use
GB/T13911—2008
The identification of nickel electroplating layer for engineering use shall be as specified in GB/T12332. The identification of the type, sulfur content and ductility of the engineering nickel plating layer in the identification is shown in Table 7. In order to ensure good bonding between the plating layer and the base metal, engineering nickel sometimes needs heat treatment before and after plating. The characteristic symbols of the plating heat treatment are shown in Table 6. The identification examples and explanations are as follows: Example 1 Electroplating layer GB/T12332-Fe//Ni50sf This identification indicates the identification of the engineering nickel electroplating layer with a minimum local thickness of 50μm and no sulfur electroplated on a carbon steel substrate. Example 2: Electroplating layer GB/T12332-A1//Ni75pd This identification indicates the identification of the engineering nickel electroplating layer with a minimum local thickness of 75um, no sulfur electroplated on an aluminum alloy substrate, and the nickel layer contains co-deposited silicon carbide particles.
Example 3: Electroplated layer GB/T12332-Fe/[SR(210)2]/Ni25sf/[ER(210)22] This symbol indicates that the minimum local thickness of the electroplated nickel electroplated layer on the high-strength steel substrate is 25μm and sulfur-free. Before electroplating, it is subjected to stress relief heat treatment at 210℃ for 2h, and after electroplating, it is subjected to brittleness reduction heat treatment at 210℃ for 22h. Note: The symbols of nickel or nickel alloy coating, bottom coating and surface coating are separated by slashes (/) according to the order of coating. The coating identification should include the coating thickness in microns and the heat treatment requirements. Steps that are not required between processes should be marked with double slashes (//). Table 7 Symbols, sulfur content and ductility of different types of nickel electroplating layers Type of electroplating layer
Sulfur-free nickel with particles dispersed in nickel mother solution
5.7 Identification of chemically plated (autocatalytic) nickel-phosphorus alloy coating Sulfur content (mass fraction)/%
Ductility/%
The quality of chemically plated nickel-phosphorus coating is closely related to the characteristics of the base metal, the coating and heat treatment conditions (see the instructions and regulations of GB/T13913). Therefore, the identification of chemically plated nickel-phosphorus coating includes the general identification specified in 4.1, and if necessary, it should also include the identification of special alloys of the base metal, the requirements for relieving internal stress of the base and coating, and the phosphorus content in the chemically plated nickel-phosphorus coating. Double slashes (//) will be used to indicate that a step or operation is not listed or omitted. Chemically plated nickel-phosphorus coatings should be identified by the symbol NiP, and the value of the phosphorus content of the coating should be filled in the parentheses immediately following it, and then the minimum local thickness of the chemically plated nickel-phosphorus coating should be marked thereafter, in μm. 5
GB/T13911—2008
Typical identification examples are as follows. For identification of atypical chemical plating, please refer to GB/T13913. Example 1: Chemical nickel-phosphorus plating GB/T13913-Fe<16Mn>[SR(210)22]/NiP(10)15/Cr0.5[ER(210)22] This identification indicates that a nickel-phosphorus plating layer with a phosphorus content of 10% (mass fraction) and a thickness of 15μm is chemically plated on a 16Mn steel substrate. Before chemical plating, a stress relief heat treatment at 210℃ for 22h is required. After chemical nickel plating, 0.5μm thick chromium is electroplated on its surface. Finally, a heat treatment at 210℃ for 22h is performed to eliminate hydrogen embrittlement. Example 2: Chemical nickel-phosphorus plating GB/T13913-Al<2B12>//NiP(10)15/Cr0.5//This mark indicates that the same plating as in Example 1 is plated on the aluminum alloy substrate and no heat treatment is required. Example 3: Chemical nickel-phosphorus plating GB/T13913-Cu//NiP(10)15/Cr0.5//This mark indicates that the same coating as in Example 1 is plated on a copper alloy substrate and no heat treatment is required. 5.8 Identification of silver and silver alloy electroplated layers for engineering purposes For the identification of silver and silver alloy electroplated layers for engineering purposes, see the identification provisions of ISO4521. The commonly used thicknesses of precious metal coatings are shown in Table 8. Typical identification examples are as follows, and non-typical identification refers to ISO4521: Example 1: Electroplated layer ISO4521-Fe/Ag10 This mark indicates the identification of a silver electroplated layer with a thickness of 10μm electroplated on a steel metal substrate. Example 2: Electroplated layer ISO4521-Fe/Cu10Ni10Ag5 This mark indicates the identification of a silver electroplated layer with a thickness of 10μm electroplated on a steel metal substrate + 10μm nickel electroplated layer + 5μm electroplated silver.
Example 3: Electroplated layer ISO4521-Al/Ni20Ag5 This mark indicates the mark of a 20μm nickel-plated layer plus a 5μm silver-plated layer on an aluminum or aluminum alloy substrate. 5.9 Marking of gold and gold alloy electroplated layers for engineering purposes The marking of gold and gold alloy electroplated layers for engineering purposes is specified in ISO4523. If the purity of gold metal is required, the mass percentage can be listed in brackets () after the element symbol of the metal, accurate to one decimal place. The commonly used thickness of precious metal coatings is shown in Table 8. Marking examples and explanations are as follows:
Example 1: Electroplated layer ISO4523-Fe/Au (99.9) 2.5 This mark indicates the mark of a 2.5μm gold-plated layer with a purity of 99.9% on a steel metal substrate. Example 2: Electroplating layer ISO4523-Fe/Cu10Ni5Aul This mark indicates that a 10μm thick copper layer is electroplated on a steel metal substrate, followed by a 5μm thick nickel layer, and then a 1μm gold layer is electroplated.
Example 3: Electroplating layer ISO4523-Al/Ni20Au0.5 This mark indicates that a 0.5μm gold layer is electroplated on an aluminum or aluminum alloy substrate after a 20μm thick nickel layer is electroplated. Note 1: For the definition and identification of gold alloys, see ISO4523. Note 2: If necessary, the thickness of silver and silver alloy coatings can also be multiples of 2μm. Table 8 Common thickness of silver and silver alloy plating, gold and gold alloy plating Silver and silver alloy plating thickness
5.10 Identification of tin plating, tin-lead plating and tin-nickel alloy plating on metal substrates Gold and gold alloy plating thickness
Unit: micrometer
The surface characteristics of tin plating, tin-lead plating and tin-nickel alloy plating on metal substrates are related to the use requirements of the plating in some cases (see GB/T12599, GB/T17461 and GB/T17462). The identification of tin and tin alloy plating should include the surface characteristics of the plating (see Table 9). The alloy plating should be marked with the content of the main elements in brackets after the main metal symbol. For non-typical identification, please refer to GB/T12599, GB/T17461, and GB/T17462. Typical identification examples are as follows: Example 1: Electroplating layer GB/T12599-Fe/Ni2.5Sn5f This identification indicates that a 2.5μm nickel base coating plus a 5μm tin coating is plated on a steel or iron base metal, and a melt flow treatment is applied after plating. Example 2: Electroplating layer GB/T17461-Fe/Ni5Sn60-Pb10f This identification indicates that a 5μm nickel base coating plus a 10μm tin-lead coating with a nominal tin content of 60% (mass ratio) is plated on a steel base, and a tin-lead alloy electroplating layer is subjected to a heat-melt treatment after plating. Example 3: Electroplating layer GB/T17462-Fe/Cu2.5SnNi10 This mark indicates that a 5μm nickel base coating + 10μm tin-nickel alloy electroplating layer with no tin content requirement is plated on a steel substrate. Table 9 Surface characteristics of tin and tin alloy coatings Symbol Surface characteristics of coating
Matte coating
Bright coating
Flow treated coating
GB/T13911-2008
National Standard of the People's Republic of China
Methods for marking metal plating and chemical treatment
GB/T13911-2008
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