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QC/T 625-2024: Metallic coatings and conversion coatings for automobile Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid QC/T 625: Historical versions
QC/T 625-2024: Metallic coatings and conversion coatings for automobile---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/QCT625-2024QC AUTOMOTIVE INDUSTRY STANDARD ICS 43.020 CCS T 04 Replacing QC/T 625-2013 Metallic Coatings and Conversion Coatings for Automobile Issued on. JULY 19, 2024 Implemented on. JANUARY 1, 2025 Issued by. Ministry of Industry and Information Technology of the People��s Republic of China. Table of ContentsForeword... 3 1 Scope... 5 2 Normative References... 5 3 Terms and Definitions... 6 4 Representation Method of Metallic Coatings and Conversion Coatings for Automobile... 6 5 Copper + Nickel + Chromium and Nickel + Chromium Electroplated Coating... 7 6 Zinc Electroplated Coating... 10 7 Tin Electroplated Coating... 13 8 Silver Electroplated Coating... 13 9 Copper Electroplated Coating... 14 10 Nickel and Copper + Nickel Electroplated Coating... 14 11 Chromium Electroplated Coating... 15 12 Electrochemical Oxidation Film of Aluminum and Aluminum Alloys... 15 13 Electroless Nickel Plating... 16 14 Conversion Coatings of Iron and Steel Parts... 17 15 Passivation Treatment Layer of Zinc Alloys... 18 16 Lead-tin Alloy Electroplated Coating... 18 17 Zinc-nickel Alloy Electroplated Coating... 19 18 Zinc-iron Alloy Electroplated Coating... 20 19 Tin-zinc Alloy Electroplated Coating... 21 20 Vacuum Aluminized Coating... 22 21 Non-electrolytic Zinc Sheet Coating... 221 ScopeThis 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 ReferencesThe 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 Coatings3 Terms and DefinitionsThis document does not have terms or definitions that need to be defined.4 Representation Method of Metallic Coatings andConversion 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 Coating5.1 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 Coating6.1 Classification No. Resistance to Copper Accelerated Acetic Acid Salt Spray (CASS)Base Material Working Condition 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 Coating7.1 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 Coating8.1 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 Coating9.1 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 Coating10.1 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 Coating11.1 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 Alloys12.1 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 Plating13.1 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 Parts14.1 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. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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