GB/T 12611-2008 Technical requirements of quality control for metal parts to be coated
1 Scope
This standard specifies the technical requirements for quality control for metal parts to be coated.
This standard applies to the quality control and acceptance of metal parts before electroplating, electroless plating, chemical passivation, chemical oxidation, electrochemical oxidation and other coating.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions of, any of these publications do not apply to this standard. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies.
GB/T 197 General purpose metric screw threads - Tolerances (GB/T 197-2003, ISO 9651:1998, MOD)
GB/T 1172 Conversion of hardness and strength for ferrous metal
GB/T 3138 Metallic and other inorganic coatings - Surface treatment, metallic and other inorganic coatings - Vocabulary (GB/T 3138-1995, neq ISO 2079: 1981)
GB/T 5267.1 Fasteners - Electroplated coatings (GB/T 5267.1- 2002, ISO 4092: 1999, IDT)
GB/T 5270 Metallic coatings on metallic substrates - Electrodeposited and chemically deposited coatings - Review of methods available for testing adhesion (GB/T 5270-2005; ISO 2819: 1980, IDT)
GB/T 6463 Metallic and other inorganic coatings - Review of methods of measurement of thickness (GB/T 6463-2005; ISO 3882: 2003, IDT)
GB/T 12609 Electrodeposited metallic coatings and related finishes-Sampling procedures for inspection by attributes (GB/T 12609-2005; ISO 4519: 1980, IDT)
GB/T 13911 Designation for metallic coating and chemical treatment
GB/T 17720 Metallic coatings - Review of porosity tests (GB/T 17720-1999, eqv ISO 10308: 1995)
GB/T 20015 Metallic and other inorganic coatings - Automated controlled shot-peening of metallic articles prior to nickel, autocatalytic nickel or chromium plating, or as a final finish (GB/T 20015-2005; ISO 12686: 1999, MOD)
3 Terms and Definitions
For the purposes of this standard, the terms and definitions given in GB/T 3138 apply.
4 Information to be obtained by the electroplater before coating of metal parts
4.1 Necessary information
Before metal parts are coated, the electroplater shall obtain the following information in writing from the contract, the order contract or the engineering drawings:
a) Identification of coating (see GB/T 13911);
b) The main surface of the specimen to be coated shall be marked on the workpiece drawing, or described by the sample with appropriate marks;
c) Requirements for the type, size and number of allowable defects of the coating (see Clause 5);
d) Requirements for appearance and surface defect treatment of metal parts, such as mechanical grinding, chemical polishing and leveling, and electrochemical polishing and leveling; specimens provided or approved by the purchaser can also be used to show the appearance of metal parts and the required treatment for comparison;
e) Minimum thickness of coating, and test method for thickness measurement (see GB/T 6463);
f) Requirements for adhesion and porosity of coatings of metal parts and the test methods (see GB/T 5270 and GB/T 17720);
g) Requirements for tensile strength of the workpiece and the heat treatment to reduce stress before electroplating;
h) Sampling plan and acceptance standards (see GB/T 12609).
4.2 Additional information
Contents
Foreword i
1 Scope
2 Normative References
3 Terms and Definitions
4 Information to be obtained by the electroplater before coating of metal parts
5 Requirements of quality control for metal parts to be coated
6 Other requirements
GB/T 12611-2008 Technical requirements of quality control for metal parts to be coated
1 Scope
This standard specifies the technical requirements for quality control for metal parts to be coated.
This standard applies to the quality control and acceptance of metal parts before electroplating, electroless plating, chemical passivation, chemical oxidation, electrochemical oxidation and other coating.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions of, any of these publications do not apply to this standard. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies.
GB/T 197 General purpose metric screw threads - Tolerances (GB/T 197-2003, ISO 9651:1998, MOD)
GB/T 1172 Conversion of hardness and strength for ferrous metal
GB/T 3138 Metallic and other inorganic coatings - Surface treatment, metallic and other inorganic coatings - Vocabulary (GB/T 3138-1995, neq ISO 2079: 1981)
GB/T 5267.1 Fasteners - Electroplated coatings (GB/T 5267.1- 2002, ISO 4092: 1999, IDT)
GB/T 5270 Metallic coatings on metallic substrates - Electrodeposited and chemically deposited coatings - Review of methods available for testing adhesion (GB/T 5270-2005; ISO 2819: 1980, IDT)
GB/T 6463 Metallic and other inorganic coatings - Review of methods of measurement of thickness (GB/T 6463-2005; ISO 3882: 2003, IDT)
GB/T 12609 Electrodeposited metallic coatings and related finishes-Sampling procedures for inspection by attributes (GB/T 12609-2005; ISO 4519: 1980, IDT)
GB/T 13911 Designation for metallic coating and chemical treatment
GB/T 17720 Metallic coatings - Review of porosity tests (GB/T 17720-1999, eqv ISO 10308: 1995)
GB/T 20015 Metallic and other inorganic coatings - Automated controlled shot-peening of metallic articles prior to nickel, autocatalytic nickel or chromium plating, or as a final finish (GB/T 20015-2005; ISO 12686: 1999, MOD)
3 Terms and Definitions
For the purposes of this standard, the terms and definitions given in GB/T 3138 apply.
4 Information to be obtained by the electroplater before coating of metal parts
4.1 Necessary information
Before metal parts are coated, the electroplater shall obtain the following information in writing from the contract, the order contract or the engineering drawings:
a) Identification of coating (see GB/T 13911);
b) The main surface of the specimen to be coated shall be marked on the workpiece drawing, or described by the sample with appropriate marks;
c) Requirements for the type, size and number of allowable defects of the coating (see Clause 5);
d) Requirements for appearance and surface defect treatment of metal parts, such as mechanical grinding, chemical polishing and leveling, and electrochemical polishing and leveling; specimens provided or approved by the purchaser can also be used to show the appearance of metal parts and the required treatment for comparison;
e) Minimum thickness of coating, and test method for thickness measurement (see GB/T 6463);
f) Requirements for adhesion and porosity of coatings of metal parts and the test methods (see GB/T 5270 and GB/T 17720);
g) Requirements for tensile strength of the workpiece and the heat treatment to reduce stress before electroplating;
h) Sampling plan and acceptance standards (see GB/T 12609).
4.2 Additional information
Contents of GB/T 12611-2008
Contents
Foreword i
1 Scope
2 Normative References
3 Terms and Definitions
4 Information to be obtained by the electroplater before coating of metal parts
5 Requirements of quality control for metal parts to be coated
6 Other requirements
