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表征Q235钢腐蚀速率的几种方法的比较研究

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  • 1中国电器科学研究院股份有限公司; 2广东工业大学机电工程学院; 3东风汽车集团股份有限公司技术中心
关 蕾(1988-),副教授,博士,主要从事工程材料的腐蚀评价,电话:020-39322212,E-mail:lguan@gdut.edu.cn

收稿日期: 2020-08-02

  网络出版日期: 2025-07-09

基金资助

广州市科技计划项目(201804020089);国家自然科学基金 (51701047)资助

Comparative Study of Corrosion Rates Determined by Several Methods for Q235 Steel

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  • (1. China National Electric Apparatus Research Institute Co., Ltd., Guangzhou 510663, China; 2. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China; 3. Dongfeng Motor Corporation Technical Centre, Wuhan 430053, China)

Received date: 2020-08-02

  Online published: 2025-07-09

摘要

目前常用的腐蚀速率测量方法有电化学测量法以及重量法,但在早期腐蚀阶段其测量准确性有限。针对该问题,以Q235钢在pH值为5的3.5%NaCl介质中的腐蚀行为为研究对象,通过传统的电化学阻抗谱分析了早期腐蚀动力学行为,通过法拉第定律计算了腐蚀速率。进一步开展静态浸泡试验,采用激光共聚焦显微镜测得体积缩减,测量浸泡样品的腐蚀失重,并换算为腐蚀速率。通过对比电化学测试法、失重法和体积缩减法的结果,发现在早期浸泡阶段,体积缩减法可以获得更为准确的腐蚀速率,为其余2种方法进行修正。

本文引用格式

陈心欣, 关蕾, 李万江, 张晓东, 付益平, 李雨 . 表征Q235钢腐蚀速率的几种方法的比较研究[J]. 材料保护, 2021 , 54(2) : 34 -39 . DOI: 10.16577/j.cnki.42-1215/tb.2021.02.006

Abstract

Electrochemical measurement and mass loss have been applied to acquire the corrosion rate, but the accuracy is limited when the corrosion is in its early stages. In this study, the early stages corrosion behavior of Q235 steel in 3.5% NaCl solution with pH=5 was investigated. The early stages corrosion kinetics behavior was obtained by traditional electrochemical approach, and the corrosion rate was calculated by Faraday’s law. Furthermore, the samples were carried out by conventional static immersion test. Subsequently, the volume reduction was measured by laser scanning confocal microscope (LSCM), the weight loss was also obtained. By comparing the corrosion rates obtained by these methods, it was obtained that corrosion rate in early stages obtained by volume reduction was the most accurate, which could be used to revise the corrosion rate obtained by other methods.
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