QC/T 625-2024 English PDF (QCT625-2024)

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QC/T 625-2024: Metallic coatings and conversion coatings for automobile
QC/T 625-2024
QC
AUTOMOTIVE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
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 Contents
Foreword ... 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 ... 22
Foreword
This document was drafted in accordance with the rules provided in GB/T 1.1-2020 Directives
for Standardization - Part 1: Rules for the Structure and Drafting of Standardizing Documents.
This document serves as a replacement for QC/T 625-2013 Metallic Coatings and Conversion
Coatings for Automobile. In comparison with QC/T 625-2013, the main technical changes are
as follows:
a) The scope of application of metallic coatings and conversion coatings for automobile
is modified (see Chapter 1; Chapter 1 of Version 2013);
b) The provision on the thickness of the chromium coating of copper + nickel +
chromium and nickel + chromium electroplated coating is modified (see Table 2;
Table 2 of Version 2013);
c) The provision on the salt spray corrosion resistance of copper + nickel + chromium
electroplated coating on the plastic substrate is modified (see Table 3; Table 3 of
Version 2013);
d) The provision on the time that substrate corrosion appears on the corrosion resistance
of zinc electroplated coating is added (see Table 5);
e) The requirements for the surface friction coefficient of zinc electroplated coating are
added (see 6.5);
f) The provision that threaded fasteners shall comply with GB/T 5267.1 is deleted (see
5.5 of Version 2013);
g) The requirements for the surface friction coefficient of copper electroplated coating
are added (see 9.3);
h) The provisions on the thickness of zinc-nickel alloy electroplated coating and the
color passivation layer of zinc-nickel alloy electroplated coating are added (see Table
18);
i) The requirements for the time that zinc corrosion appears on the corrosion resistance
of zinc-nickel alloy electroplated coating are modified, and the provision on the time
that substrate corrosion appears on the corrosion resistance of zinc-nickel alloy
electroplated coating is added (see Table 19; Table 19 of Version 2013);
j) The requirements for the surface friction coefficient of zinc-nickel alloy electroplated
coating are added (see 17.4);
k) The provision on the thickness of zinc-iron alloy electroplated coating is added (see
Table 20);
Metallic Coatings and Conversion Coatings for Automobile
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
GB/T 10125 Corrosion Tests in Artificial Atmospheres - Salt Spray Tests
GB/T 11376 Metallic and Other Inorganic Coatings - Phosphate Conversion Coating of Metals
GB/T 11379 Metallic Coatings - Electroplated Coatings of Chromium for Engineering Purposes
GB/T 12333 Metallic Coatings - Electroplated Coatings of Copper for Engineering Purposes
GB/T 12599 Metallic Coatings - Electroplated Coatings of Tin - Specification and Test Methods
GB/T 12600 Metallic Coatings - Electroplated Coatings of Nickel plus Chromium on Plastics
Materials
GB/T 12967.3 Test Methods for Anodic Oxidation Coatings and Organic Polymer Coatings on
Aluminum and Aluminum Alloys - Part 3: Salt Spray Test
GB/T 13912 Metallic Coatings - Hot Dip Galvanized Coatings on Fabricated Iron and Steel
Articles - Specifications and Test Methods
GB/T 15519 Chemical Conversion Coatings - Black Oxide Coating on Iron and Steel -
Specification and Test Methods
GB/T 16921 Metallic Coatings - Measurement of Coating Thickness - X-ray Spectrometric
Methods
GB/T 41950 Metallic Coatings - Electroplated Coatings of Zinc and Zinc Alloys on Iron or
Steel with Supplementary Cr (VI)-free Treatment
QC/T 721 Non-electrolytically Applied Zinc Flake Coatings for Automobile
SJ/T 11110 Specification for Electrodeposited Silver 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).
Use chemical symbols to represent the base metal or the main metal in the alloy matrix,
followed by a slash (/).
Use chemical symbols, Arabic numerals and lowercase...