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GB/T 18226-2025: Specification for steel component anticorrosion of highway traffic engineering
Status: Valid GB/T 18226: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
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Specification for steel component anticorrosion of highway traffic engineering
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GB/T 18226-2025
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| GB/T 18226-2015 | English | 679 |
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Specification for steel component anticorrosion of highway engineering
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GB/T 18226-2015
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| GB/T 18226-2000 | English | 439 |
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Highway Traffic engineering technical conditions of the steel component anticorrosion
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GB/T 18226-2000
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Basic data | Standard ID | GB/T 18226-2025 (GB/T18226-2025) | | Description (Translated English) | Specification for steel component anticorrosion of highway traffic engineering | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | A29 | | Classification of International Standard | 25.220 | | Word Count Estimation | 42,444 | | Date of Issue | 2025-08-29 | | Date of Implementation | 2026-03-01 | | Older Standard (superseded by this standard) | GB/T 18226-2015 | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | GB/T 18226-2025: Specification for steel component anticorrosion of highway traffic engineering---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/GBT18226-2025
ICS 25.220
CCSA29
National Standard of the People's Republic of China
Replaces GB/T 18226-2015
Technical requirements for corrosion protection of steel components in highway traffic engineering
Released on August 29, 2025
Implementation on March 1, 2026
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Anti-corrosion coating classification 3
5 General Requirements 4
6 Technical Requirements 4
7 Test methods 19
Appendix A (Informative) Performance requirements and test methods for anti-corrosion coatings on other steel components 24
Appendix B (Normative) Test method for adhesion of hot-dip aluminum coating 26
Appendix C (Normative) Test method for uniformity of hot-dip aluminum coating 28
Appendix D (Normative) Test method for adhesion of metal coatings 29
Appendix E (Normative) Cathodic Disbonding Resistance Test Method 31
Reference 32
Preface
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document replaces GB/T 18226-2015 "Technical conditions for corrosion protection of steel components in highway traffic engineering".
In addition to structural adjustments and editorial changes, the main technical changes are as follows.
a) Added terms and definitions for highway traffic engineering steel components and zinc-aluminum-magnesium alloy coatings (see 3.1 and 3.8);
b) Changed the following. hot-dip galvanized coating, hot-dip aluminum coating, hot-dip galvanized aluminum alloy coating, hot-dip aluminum-zinc alloy coating, zinc-chromium coating
(Dacromet), powder galvanized coating, electrostatic spray polyester coating, fluidized bed plastic coating, hot dip galvanized polyester composite coating, hot dip
Galvanized plastic-dip composite coating, hot-dip aluminum-polyester composite coating, hot-dip aluminum-dip plastic-dip composite coating, hot-dip galvanized aluminum alloy polyester composite coating
Composite coating, hot dip galvanized aluminum alloy plastic coating, hot dip aluminum zinc alloy polyester composite coating, hot dip aluminum zinc alloy plastic coating
Definitions of composite coatings and epoxy zinc-based polyester composite coatings (see 3.2~3.7, 3.9~3.19, 3.1~3.14 of the.2015 edition,
March 17 to March 19);
c) The terms and definitions of epoxy zinc-based powder coating and pure polyester powder coating have been deleted (see 3.15 and 3.16 of the.2015 edition);
d) The classification of anti-corrosion coatings has been changed (see Chapter 4, Chapter 4 of the.2015 edition);
e) The general requirements for corrosion protection of steel components have been changed (see Chapter 5, Chapter 5 of the.2015 edition);
f) Changed the hot-dip galvanized coating, hot-dip aluminum coating, electrostatic spray polyester coating, fluidized bed plastic coating, hot-dip galvanized aluminum alloy coating
Material technical requirements for coatings, hot-dip aluminum-zinc alloy coatings, and epoxy zinc-based polyester composite coatings (see 6.1.1, 6.2.1, 6.3.1,
6.4.1, 6.9.1, 6.12.1, 6.15.1, and 6.1.1, 6.2.1, 6.3.1, 6.4.1, 6.9.1, 6.12.1, 6.15.1 of the.2015 edition);
g) Changed the hot-dip galvanized coating, hot-dip aluminum coating, electrostatic spray polyester coating, fluidized bed plastic coating, hot-dip galvanized aluminum alloy coating
Technical requirements for the appearance quality of coatings, hot-dip aluminum-zinc alloy coatings, and epoxy zinc-based polyester composite coatings (see 6.1.2, 6.2.2, 6.3.2,
6.4.2, 6.9.2, 6.12.2, 6.15.3, and 6.1.3, 6.2.3, 6.3.2, 6.4.2, 6.9.3, 6.12.3, 6.15.5.1 of the.2015 edition);
h) Changed the hot-dip galvanized coating, hot-dip aluminum coating, hot-dip galvanized polyester composite coating, hot-dip galvanized plastic composite coating, hot-dip
Aluminum polyester composite coating, hot dip aluminum dip plastic composite coating, hot dip galvanized aluminum alloy coating, hot dip galvanized aluminum alloy polyester composite coating
layer, hot dip galvanized aluminum alloy dip plastic composite coating, hot dip aluminum zinc alloy coating, hot dip aluminum zinc alloy polyester composite coating, hot dip
Technical requirements for adhesion and thickness of aluminum-zinc alloy plastic-coated composite coatings (see 6.1.3, 6.2.3, 6.5.1, 6.6.1, 6.7.1, 6.8.1,
6.9.3, 6.10.1, 6.11.1, 6.12.3, 6.13.1, 6.14.1, 6.1.2, 6.2.2, 6.5.1, 6.6.1, 6.7.1, 6.8.1 of the.2015 edition,
6.9.2, 6.10.1, 6.11.1, 6.12.2, 6.13.1, 6.14.1);
i) Changed the hot-dip galvanized coating, hot-dip aluminum coating, electrostatic spray polyester coating, fluidized bed plastic coating, hot-dip galvanized aluminum alloy coating
Technical requirements for uniformity of hot-dip aluminum-zinc alloy coating (see 6.1.4, 6.2.4, 6.3.4, 6.4.4, 6.9.4, 6.12.4,.2015
Versions 6.1.4, 6.2.4, 6.3.4, 6.4.4, 6.9.4, and 6.12.4);
j) Changed the hot-dip galvanized coating, hot-dip aluminum coating, electrostatic spray polyester coating, fluidized bed plastic coating, hot-dip galvanized aluminum alloy coating
Adhesion technical requirements for coatings, hot-dip aluminum-zinc alloy coatings, and epoxy zinc-based polyester composite coatings (see 6.1.5, 6.2.5, 6.3.5,
6.4.5, 6.9.5, 6.12.5, 6.15.5, and 6.1.5, 6.2.5, 6.3.5, 6.4.5, 6.9.5, 6.12.5, 6.15.5.3 of the.2015 edition);
k) Changes to the anti-bending performance technology of hot-dip galvanized coating, hot-dip aluminum coating, electrostatic spray polyester coating, and fluidized bed plastic coating
Requirements (see 6.1.6, 6.2.6, 6.3.6, 6.4.6, and 6.1.6, 6.2.6, 6.3.6, 6.4.6 of the.2015 edition);
l) Changed the hot-dip galvanized coating, hot-dip aluminum coating, electrostatic spray polyester coating, fluidized bed plastic coating, hot-dip galvanized aluminum alloy coating
Technical requirements for salt spray corrosion resistance of hot-dip aluminum-zinc alloy coatings (see 6.1.7, 6.2.7, 6.3.10, 6.4.10, 6.9.6,
6.12.6, 6.1.7, 6.2.7, 6.3.10, 6.4.10, 6.9.6, and 6.12.6 of the.2015 edition);
m) Modified the thickness technical requirements for electrostatic spray polyester coating, fluidized bed dipping coating, and epoxy zinc-based polyester composite coating (see
6.3.3, 6.4.3, 6.15.4, and 6.3.3, 6.4.3, 6.15.5.2 of the.2015 edition);
n) Changed the technical requirements for wear resistance of electrostatic spray polyester coating, fluidized bed dipping coating, and epoxy zinc-based polyester composite coating (see
6.3.7, 6.4.7, 6.15.6, and 6.3.7, 6.4.7, 6.15.5.6 of the.2015 edition);
o) Changed the technical requirements for impact resistance of electrostatic spray polyester coating, fluidized bed dipping coating, and epoxy zinc-based polyester composite coating (see
6.3.8, 6.4.8, 6.15.7, and 6.3.8, 6.4.8, 6.15.5.7 of the.2015 edition);
p) Changed the chemical solvent corrosion resistance performance of electrostatic spray polyester coating, fluidized bed dipping coating, and epoxy zinc-based polyester composite coating.
Technical requirements (see 6.3.9, 6.4.9, 6.15.8, 6.3.9, 6.4.9, 6.15.5.8 of the.2015 edition);
q) Changed the weather resistance (xenon arc light source) of electrostatic spray polyester coating, fluidized bed dipping coating, and epoxy zinc-based polyester composite coating.
Technical requirements (see 6.3.11, 6.4.11, 6.15.11, and 6.3.12, 6.4.13, and 6.15.5.13 of the.2015 edition);
r) Modified the technical requirements for moisture and heat resistance of electrostatic spray polyester coating and fluidized bed dipping coating (see 6.3.12, 6.4.12,.2015
Version 6.3.11, 6.4.11);
s) Added technical requirements for low-temperature resistance of electrostatically sprayed polyester coatings and fluidized bed dipping coatings (see 6.3.13 and 6.4.13);
t) Deleted the technical requirements and test methods for low temperature embrittlement resistance of fluidized bed plastic dipping coating (see 6.4.12,.2015 edition)
7.16);
u) Changed the hot-dip galvanized polyester composite coating, hot-dip galvanized plastic composite coating, hot-dip aluminum-coated polyester composite coating, hot-dip aluminum-coated
Plastic composite coating, hot dip galvanized aluminum alloy polyester composite coating, hot dip galvanized aluminum alloy dip plastic composite coating, hot dip aluminum zinc alloy
Technical requirements for inner and outer coatings of polyester composite coatings and hot-dip aluminum-zinc alloy plastic-coated composite coatings (see 6.5.2, 6.5.3,
6.6.2, 6.6.3, 6.7.2, 6.7.3, 6.8.2, 6.8.3, 6.10.2, 6.10.3, 6.11.2, 6.11.3, 6.13.2, 6.13.3, 6.14.2,
6.14.3,.2015 version 6.5.2, 6.5.3, 6.6.2, 6.6.3, 6.7.2, 6.7.3, 6.8.2, 6.8.3, 6.10.2, 6.10.3, 6.11.2,
6.11.3, 6.13.2, 6.13.3, 6.14.2, 6.14.3);
v) Deleted the hot-dip galvanized polyester composite coating, hot-dip galvanized plastic composite coating, hot-dip aluminum-coated polyester composite coating, hot-dip aluminum-coated
Plastic composite coating, hot dip galvanized aluminum alloy polyester composite coating, hot dip galvanized aluminum alloy dip plastic composite coating, hot dip aluminum zinc alloy
Technical requirements and test methods for temperature alternating resistance of polyester composite coatings and hot-dip aluminum-zinc alloy plastic-coated composite coatings (see
2015 edition (6.5.4, 6.6.4, 6.7.4, 6.8.4, 6.10.4, 6.11.4, 6.13.4, 6.14.4, 7.18);
w) Changed the cyclic salt spray resistance of hot-dip aluminum-coated polyester composite coating, hot-dip aluminum-coated plastic composite coating, and epoxy zinc-based polyester composite coating
Corrosion performance technical requirements (see 6.7.4, 6.8.4, 6.15.10, and 6.7.5, 6.8.5, and 6.15.5.10 of the.2015 edition);
x) The technical requirements for epoxy zinc-based coatings have been deleted (see 6.15.4 of the.2015 edition);
y) Deleted the technical requirements for wet adhesion, bending resistance and heat and humidity resistance of epoxy zinc-based polyester composite coating (see the.2015 edition
6.15.5.4, 6.15.5.5, 6.15.5.11);
z) Modified the technical requirements for cathodic stripping resistance and low temperature resistance of epoxy zinc-based polyester composite coatings (see 6.15.9, 6.15.13,
2015 Edition, 6.15.5.9 and 6.15.5.12);
aa) Added technical requirements and test methods for hot water immersion resistance of epoxy zinc-based polyester composite coatings (see 6.15.12 and 7.17);
ab) Modified the technical requirements for zinc-chromium coating (Dacromet) (see 6.16, 6.16 of the.2015 edition);
ac) The technical requirements for powder galvanized coating have been changed (see 6.17, 6.17 of the.2015 edition);
ad) Added technical requirements for zinc-aluminum-magnesium alloy coatings (see 6.18);
ae) The preparation of test specimens, materials, appearance quality, thickness of single coatings and total thickness of composite coatings on steel substrates, delamination method,
Conversion method, adhesion, uniformity of zinc-containing metal coatings, uniformity of non-metallic coatings, uniformity of hot-dip aluminum coatings, metal
Coating adhesion, dipping coating adhesion, wear resistance, impact resistance, chemical solvent corrosion resistance, and cathodic disbonding resistance
Energy, non-metallic coating salt spray corrosion resistance, cyclic salt spray corrosion resistance, weather resistance (xenon arc light source), heat and humidity resistance,
Low temperature performance, zinc chromium coating (Dacromet) test method (see 7.1, 7.2, 7.3, 7.4.1, 7.4.2.2, 7.4.3, 7.5, 7.6.1, 7.6.2,
7.6.3, 7.7.1, 7.7.2.1, 7.9, 7.10, 7.11, 7.12, 7.13.2, 7.14, 7.15, 7.16, 7.18, 7.20,.2015 version of 7.1,
7.2, 7.3, 7.4.1, 7.4.2.2, 7.4.3, 7.5, 7.6.1, 7.6.2, 7.6.3, 7.7.1, 7.7.2.1, 7.9, 7.10, 7.11, 7.7.4, 7.12,
July 14, July 19, July 15, July 17, July 20);
af) Added the selection of composite coating thickness method with metal inner layer, eddy current method, adhesion of other non-metallic coatings, non-metallic coatings
Test methods for bending resistance of metal coatings, salt spray corrosion resistance of composite coatings, and resistance to natural exposure (see 7.4.2.1,
7.4.2.3, 7.7.2.2, 7.8.2, 7.13.3, 7.19);
ag) Deleted the microscope method, the cross-cut test method for polyester coatings, the adhesion of epoxy zinc-based polyester composite coatings, and the bending resistance of plastic dip coatings.
Bend performance test method (see 7.4.2.1, 7.7.2.2, 7.7.3, 7.8.1 of the.2015 edition);
ah) Added other steel structure anti-corrosion coating performance requirements and test methods, metal coating adhesion test method (see Appendix A, Appendix
D);
ai) Changed the hot-dip aluminum coating adhesion test method, hot-dip aluminum coating uniformity test method, and cathodic peeling resistance test method.
Methods (see Appendix B, Appendix C, Appendix E, and Appendix A, Appendix B, and Appendix C of the.2015 edition).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document is proposed and coordinated by the National Technical Committee for Standardization of Transportation Engineering Facilities (Highway) (SAC/TC223).
This document was drafted by. Highway Research Institute of the Ministry of Transport, Zhonglu High-Tech Traffic Inspection and Certification Co., Ltd., Anhui Provincial Transportation
Planning and Design Research Institute Co., Ltd., Beijing Jiao Ke Highway Survey and Design Institute Co., Ltd., China Railway Changjiang Transportation Design Group Co., Ltd.
Company, Beijing CCCC Huaan Technology Co., Ltd., Sichuan Highway Planning, Survey and Design Institute Co., Ltd., Anhui Expressway Test and Inspection Co., Ltd.
Testing Research Center Co., Ltd., Xuzhou Zhengling Coating Engineering Technology Research Center, Weifang Dongfang Steel Pipe Co., Ltd., Jiangsu Guoqiang Transportation Group Co., Ltd.
Limited Company.
The main drafters of this document are. Tang Chengcheng, Guo Donghua, Yang Manjuan, Xu Xin, Ge Shufang, Yu Yedong, Zhou Zhiwei, Zhu Xiaofeng, Yao Yao, Zhou Haifeng,
Han Yue, Wang Chenghu, Ye Yuxia, Yin Dongsheng, Du Kun, Liu Xiaohui, Ren Tao, Wang Gui, Zhao Yong, Lu Dongfang, Li Letuan, and Pan Shiqiang.
The previous versions of this document and the documents it replaces are as follows.
---First published as GB/T 18226-2000 in.2000 and first revised in.2015;
---This is the second revision.
Technical requirements for corrosion protection of steel components in highway traffic engineering
1 Scope
This document specifies the classification, general requirements, technical requirements and test methods of anti-corrosion coatings for corrosion protection of steel structures in highway traffic engineering.
This document applies to the corrosion protection of steel components in highway traffic engineering projects.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 470-2008 Zinc ingot
GB/T 1196-2023 Aluminium ingots for remelting
GB/T 1630.1 Plastics epoxy resins Part 1.Nomenclature
GB/T 1732 Determination of impact resistance of paint films
GB/T 1740 Determination of resistance to moisture and heat of paint films
GB/T 1768 Paints and varnishes - Determination of abrasion resistance - Rotating rubber grinding wheel method
GB/T 1839 Test methods for quality of zinc coating on steel products
GB/T 4956 Measurement of coating thickness of non-magnetic coatings on magnetic substrates - Magnetic method
GB/T 9286 Paints and varnishes cross-cut test
GB/T 10125 Artificial atmosphere corrosion test Salt spray test
GB/T 11547 Plastics - Determination of resistance to liquid chemical reagents
GB/T 18684-2002 Technical requirements for zinc-chromium coatings
GB/T 22040 Weather resistance requirements and test methods for plastic products used in highway facilities
GB/T 24514 Determination of mass and chemical composition of zinc-based and (or) aluminum-based coatings per unit area on steel surface - Gravimetric method, inductive coupling method
Hybrid plasma atomic emission spectrometry and flame atomic absorption spectrometry
GB/T 26035 Flake zinc powder
GB/T 31586.2 Evaluation of adhesion/cohesion (destructive strength) of protective coatings for steel structures using protective coating systems
Acceptance criteria Part 2.Cross-cut test and cross-cut test
JT/T 600.2 Anti-corrosion powder paints and coatings for highways Part 2.Thermoplastic polyethylene (PE) powder paints and coatings
JT/T 600.3 Anti-corrosion powder paints and coatings for highways Part 3.Thermoplastic polyvinyl chloride (PVC) powder paints and coatings
JT/T 600.4 Anti-corrosion powder paints and coatings for highways Part 4.Thermosetting polyester powder paints and coatings
YB/T 4761 Continuously hot-dip galvanized aluminum-magnesium alloy coated steel sheet and strip
YS/T 310-2021 Zinc alloy ingots for hot-dip coating
3 Terms and Definitions
The following terms and definitions apply to this document.
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