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GB/T 45879-2025: Corrosion of metals and alloys - Electrochemical methods for fast test of stress corrosion cracking susceptibility
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GB/T 45879-2025: Corrosion of metals and alloys - Electrochemical methods for fast test of stress corrosion cracking susceptibility

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ICS 77.060 CCSH25 National Standard of the People's Republic of China Corrosion of metals and alloys Electrochemical rapid test method for stress corrosion susceptibility Released on June 30, 2025 Implementation on January 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 Principle 1 5 Sample preparation 3 6 Test solution 3 7 Test equipment 3 8 Test Step 4 9 Test result processing 5 10 Test Report 5 Appendix A (Informative) Determination of the Correlation Coefficients of Materials in the Determination System 6 Appendix B (Informative) Some Typical Service Environment Simulation Solutions 8 Appendix C (Informative) Application Example of Test Method --- Determination of SCC Sensitivity of X80 Pipeline Steel in Acidic Soil Environment 9 Reference 11 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. 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 was proposed by the China Iron and Steel Association. This document is under the jurisdiction of the National Technical Committee on Steel Standardization (SAT/TC183). This document was drafted by. Beijing University of Science and Technology, Metallurgical Industry Information Standards Research Institute, Suzhou Thermal Engineering Research Institute Co., Ltd., China Special Equipment Co., Ltd. Equipment Testing and Research Institute, Hebei Special Equipment Supervision and Inspection Institute, and Dongfang Boiler Co., Ltd. of Dongfang Electric Group. The main drafters of this document are. Liu Zhiyong, Hou Jie, Li Xiaogang, Li Chengtao, Zhao Bo, Tian Zijian, Du Cuiwei, Sun Zhanyuan, Li Qian, Wang Lixian, Dong Meng, Song Lijun, Sun Menghan, Dai Wenhe, and Yang Shuli. Corrosion of metals and alloys Electrochemical rapid test method for stress corrosion susceptibility 1 Scope This document specifies the principles, sample preparation, test solution, and method for the rapid electrochemical test of stress corrosion cracking susceptibility of metals and alloys. liquid, test equipment, test procedures, test result processing and test report. This document applies to the stress corrosion cracking sensitivity of carbon steel, low alloy steel, stainless steel and other metals and alloys in aqueous solution environment at room temperature. Quick test. 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 6682 Specifications and test methods for water used in analytical laboratories GB/T 10123 Terminology for corrosion of metals and alloys 3 Terms and Definitions The terms and definitions defined in GB/T 10123 and the following apply to this document. 3.1 Fast scan rate fastscanrate The scan rate is greater than 50 mV/s when the potential scan rate is controlled. 3.2 slow scan rate slowscanrate The scan rate is less than 0.5 mV/s when the potential scan rate is controlled. 3.3 Polarization current density at fast scan rate (3.1). 3.4 Polarization current density at slow scan rate (3.2). 4 Principles 4.1 The difference and relationship between the fast scan current density if and the slow scan current density is under different electrode potential conditions can be used to quickly test Stress corrosion cracking (SCC) sensitivity. This method is based on the non-steady-state electrochemical theoretical model of SCC. Fast scan rate polarization curve During the test, the electrochemical state of the sample surface can reach an unstable state controlled by the limiting diffusion, which can be equivalent to the SCC tip dislocation activation. The kinetic characteristics of the non-steady-state electrochemical process in the limiting diffusion state. When the slow scan rate polarization curve is tested, the electrode surface can maintain sufficient ...