QC/T 625-2024Metallic coatings and chemical conversion coatings for automobiles (English PDF)
汽车用涂镀层和化学处理层
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Issued by
MIIT
Level / Type
Industry · Recommended
Issue date
July 5, 2024
Implementation date
January 1, 2025
Scope
QC/T 625-2024 is the English-translated version of 汽车用涂镀层和化学处理层.
QC/T 625-2024 gives the requirements, technical conditions and test methods for the metallic coatings and conversion coatings of automobile parts and accessories; clause 3 defines no terms.
Clause 5 grades copper + nickel + chromium and nickel + chromium electroplated coatings by working condition and classification number, tabulates their salt spray corrosion resistance in Table 3, inspects thickness and corrosion resistance to GB/T 5270, GB/T 9797 and GB/T 12600 and adds a thermal cycle test for coatings on plastics.
Clause 6 heat-treats galvanized spring parts, fasteners and high-strength parts to Table 6 against hydrogen embrittlement and inspects to GB/T 9799 and GB/T 9800.
Clauses 7 to 14 grade and inspect in the same way the coatings of tin, silver, copper - porosity to GB/T 12333 - nickel, chromium - hardness to GB/T 11379 - anodic films on aluminium, electroless nickel and the conversion coatings of iron and steel; of clauses 15 to 21, on zinc alloy passivation and on lead-tin, zinc-nickel, zinc-iron and tin-zinc alloys, the preview shows only the titles.
Issued by MIIT on 5 July 2024, it replaces QC/T 625-2013 and has applied since 1 January 2025.
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Document preview — QC/T 625-2024
National Standard of the People's Republic of China
- Replacing
- QC/T 625-2013
Issued by: Ministry of Industry and Information Technology of the People's Republic of China
Contents
- Foreword3
- 1 Scope5
- 2 Normative References5
- 3 Terms and Definitions6
- 4 Representation Method of Metallic Coatings and Conversion Coatings for Automobile6
- 5 Copper + Nickel + Chromium and Nickel + Chromium Electroplated Coating7
- 6 Zinc Electroplated Coating10
- 7 Tin Electroplated Coating13
- 8 Silver Electroplated Coating13
- 9 Copper Electroplated Coating14
- 10 Nickel and Copper + Nickel Electroplated Coating14
- 11 Chromium Electroplated Coating15
- 12 Electrochemical Oxidation Film of Aluminum and Aluminum Alloys15
- 13 Electroless Nickel Plating16
- 14 Conversion Coatings of Iron and Steel Parts17
- 15 Passivation Treatment Layer of Zinc Alloys18
- 16 Lead-tin Alloy Electroplated Coating18
- 17 Zinc-nickel Alloy Electroplated Coating19
- 18 Zinc-iron Alloy Electroplated Coating20
- 19 Tin-zinc Alloy Electroplated Coating21
- 20 Vacuum Aluminized Coating22
- 21 Non-electrolytic Zinc Sheet Coating22
1 Scope
This document specifies the requirements, technical conditions and test methods for metallic coatings and conversion coatings of automobile parts and accessories.
This document is applicable to the metallic coatings and conversion coatings of automobile parts and accessories.
2 Normative References
The content of the following documents constitutes indispensable clauses of this document through normative references in the text. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 4340.1 Metallic Materials - Vickers Hardness Test - Part 1: Test Method
GB/T 4955 Metallic Coatings - Measurement of Coating Thickness - Coulometric Method by Anodic Dissolution
GB/T 4956 Non-magnetic Coatings on Magnetic Substrates - Measurement of Coating Thickness - Magnetic Method
GB/T 4957 Non-conducive Coatings on Non-magnetic Basis Metals - Measurement of Coating Thickness - Eddy Current
GB/T 5270 Metallic Coatings on Metallic Substrates - Electrodeposited and Chemically Deposited Coatings - Review of Methods Available for Testing Adhesion
GB/T 6461 Methods for Corrosion Testing of Metallic and Other Inorganic Coatings on Metallic Substrates - Rating of Test Specimens and Manufactured Articles Subjected to Corrosion Tests
GB/T 8013.1 Anodic Oxide Coatings and Organic Polymer Coatings on Aluminum and Its Alloys - Part 1: Anodic Oxide Coatings
GB/T 8014.2 Anodizing of Aluminum and Its Alloys - The Measuring Method of Thickness of Anodic Oxide Coatings - Part 2: Mass-loss Method
GB/T 9797 Metallic and Other Inorganic Coatings - Electrodeposited Coatings of Nickel, Nickel plus Chromium, Copper plus Nickel and of Copper plus Nickel plus Chromium
GB/T 9799 Metallic and Other Inorganic Coatings - Electrodeposited Coatings of Zinc with Supplementary Treatments on Iron or Steel
GB/T 9800 Chromate Conversion Coatings on Electroplated Zinc and Cadmium Coatings
3 Terms and Definitions
This document does not have terms or definitions that need to be defined.
4 Representation Method of Metallic Coatings and Conversion Coatings for Automobile
The representation method of metallic coatings and conversion coatings for automobile mainly consists of the following three parts (see Figure 1).
5 Copper + Nickel + Chromium and Nickel + Chromium Electroplated Coating
5.1 Working Condition No.
The working condition No. is used to specify the harshness of the working environment of coated parts.
5.2 Classification No.
The classification No. is used to specify the coating thickness level of coated parts under different working environments.
5.3 Salt Spray Corrosion Resistance
The working condition No. and salt spray corrosion resistance of copper + nickel + chromium and nickel + chromium electroplated coating are shown in Table 3.
5.4 Inspection of Properties
The thickness and salt spray corrosion resistance of copper + nickel + chromium and nickel + chromium electroplated coating shall be inspected, and the electroplated coating on plastics shall undergo thermal cycle test. The inspection methods shall comply with the provisions of GB/T 5270, GB/T 9797 and GB/T 12600.
6 Zinc Electroplated Coating
6.1 Classification No.
6.3 Heat Treatment
After electro-galvanizing, for spring parts, fasteners and high-strength parts, the risk of hydrogen embrittlement shall be eliminated. The heat treatment conditions for eliminating hydrogen embrittlement are shown in Table 6.
6.4 Inspection of Properties
The thickness and salt spray corrosion resistance of zinc electroplated coating shall be inspected.
The inspection methods shall comply with the provisions of GB/T 9799 and GB/T 9800. If necessary, the supply-side and the demand-side may agree to inspect other properties.
6.5 Friction Coefficient
If there are requirements for the friction coefficient of the surface of electroplated parts, they shall be determined by agreement between the supply-side and the demand-side.
7 Tin Electroplated Coating
7.1 Classification No. and Applicable Conditions
The classification No. and applicable conditions of tin electroplated coating are shown in Table 7.
7.2 Inspection of Properties
The thickness and adhesive strength of tin electroplated coating shall be inspected. The inspection methods shall comply with the provisions of GB/T 12599.
8 Silver Electroplated Coating
8.1 Classification No. and Applicable Conditions
The classification No. and applicable conditions of silver electroplated coating are shown in Table 8.
8.2 Inspection of Properties
The thickness and adhesive strength of silver electroplated coating shall be inspected. The inspection methods shall comply with the provisions of SJ/T 11110.
9 Copper Electroplated Coating
9.1 Classification No. and Applicable Conditions
The classification No. and applicable conditions of copper electroplated coating are shown in Table 9.
9.2 Inspection of Properties of Copper Electroplated Coating
The thickness, porosity and adhesive strength of copper electroplated coating shall be inspected.
The inspection methods shall comply with the provisions of GB/T 12333. If necessary, the supply-side and the demand-side may agree to inspect other properties.
9.3 Friction Coefficient
If there are requirements for the friction coefficient of the surface of electroplated parts, they shall be determined by agreement between the supply-side and the demand-side.
10 Nickel and Copper + Nickel Electroplated Coating
10.1 Classification No. and Applicable Conditions
The classification No. and applicable conditions of nickel and copper + nickel electroplated coating are shown in Table 10.
10.2 Inspection of Properties
The thickness and adhesive strength of nickel and copper + nickel electroplated coating shall be inspected.
11 Chromium Electroplated Coating
11.1 Classification No. and Applicable Conditions
The classification No. and applicable conditions of chromium electroplated coating are shown in Table 11.
11.2 Inspection of Properties
The thickness, adhesive strength and hardness of chromium electroplated coating shall be inspected. The inspection methods shall comply with the provisions of GB/T 11379. If necessary, the supply-side and the demand-side may agree to inspect other properties.
12 Electrochemical Oxidation Film of Aluminum and Aluminum Alloys
12.1 Properties and Applicable Conditions
The properties and applicable conditions of the electrochemical oxidation film of aluminum and aluminum alloys are shown in Table 12.
12.2 Inspection of Properties
The properties specified in Table 12 shall be inspected. The inspection methods shall comply with the provisions of GB/T 4340.1, GB/T 4957, GB/T 8013.1, GB/T 8014.2 and GB/T 12967.3.
13 Electroless Nickel Plating
13.1 Requirements for Properties and Applicable Conditions
The requirements for properties and applicable conditions of electroless nickel plating are shown in Table 13.
13.2 Inspection of Properties
The thickness, adhesive strength and corrosion resistance of electroless nickel plating shall be inspected.
14 Conversion Coatings of Iron and Steel Parts
14.1 Classification No. and Applicable Conditions
The classification No. and applicable conditions of the conversion coatings of iron and steel parts are shown in Table 14. […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 22 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 4340.1Metallic materials - Vickers hardness test - Part 1: Test method
- GB/T 4955Metallic coatings -- Measurement of coating thickness -- Coulometric method by anodic dissolution
- GB/T 4956Non-magnetic coatings on magnetic substrates - Measurement of coating thickness - Magnetic method
- GB/T 4957Non-conductive coatings on non-magnetic electrically conductive base metals - Measurement of coating thickness - Amplitude-sensitive eddy-current method
- GB/T 5270Metallic coatings on metallic substrates - Electrodeposited and chemically deposited coatings - Review of methods available for testing adhesion
- GB/T 6461Methods for corrosion testing of metallic and other inorganic coatings on metallic substrates -- Rating of test specimens and manufactured articles subjected to corrosion tests
Similar standards
Editions of QC/T 625
| Edition | Title | Revision | Status |
|---|---|---|---|
| QC/T 625-2024 | Metallic coatings and chemical conversion coatings for automobiles | current edition | Current |
| QC/T 625-2013 | Metallic coatings and chemical conversion coatings for automobiles | previous edition | Superseded |
This page sells the current edition, QC/T 625-2024. Earlier editions are listed for reference only.
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Related Standards
GB/T 4340.1-2024 — Metallic materials - Vickers hardness test - Part 1: Test method
GB/T 4955-2005 — Metallic coatings -- Measurement of coating thickness -- Coulometric method by anodic dissolution
GB/T 4956-2003 — Non-magnetic coatings on magnetic substrates -- Measurement of coating thickness -- Magnetic method
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