异种金属焊接接头不同环境下的腐蚀敏感性研究

李永红, 邵晓锋, 宋嘉良, 胡添奇, 白子恒, 高瑾, 肖葵

doi:10.16577/j.issn.1001-1560.2022.0279

材料保护 >

2022 , Vol. 55 >Issue 10: 76 - 81

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0279

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异种金属焊接接头不同环境下的腐蚀敏感性研究

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(1.株洲中车时代电气股份有限公司，湖南株洲412001；2.北京科技大学新材料技术研究院，北京 100083)

肖葵(1969-)，博士，研究员，主要研究方向为金属材料大气腐蚀与防护，电话：13910666748，E-mail：xiaokui@ustb.edu.cn

收稿日期: 2022-04-17

修回日期: 2022-05-11

录用日期: 2022-05-31

网络出版日期: 2023-12-23

基金资助

国家自然科学基金(51771030)资助

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Study on Corrosion Sensitivity of Welded Joints between Dissimilar Metals in Different Environments

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(1.Zhuzhou CRRC Times Electric Co.,Ltd.,Zhuzhou 412001,China；2.Institute for Advanced Materials and Techlonogy,University of Science and Technology Beijing,Beijing 100083,China)

Received date: 2022-04-17

Revised date: 2022-05-11

Accepted date: 2022-05-31

Online published: 2023-12-23

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摘要

为了研究A型动车组典型结构异种金属焊接接头在5种地区腐蚀环境模拟液中的电偶腐蚀敏感性，对异种金属304不锈钢和Q345碳钢之间选择ER 309L Si进行焊接，将焊缝试样在模拟北京、郑州、武汉、广州和万宁的溶液中浸泡120 d；通过电化学测试对腐蚀后焊缝试样不同位置进行腐蚀速率及腐蚀电位的分析，并对除锈后试样进行微观形貌观察，分析焊缝与母材之间的电偶效应。结果显示：母材和焊缝金属在5个地区的模拟溶液中腐蚀速率由大到小为：万宁>广州>武汉>郑州>北京，Q345碳钢与焊缝相互构成电偶对，前者作为阳极，产生的电偶效应作用距离由大到小为：万宁>郑州>广州>北京>武汉。经分析环境中Cl-含量对腐蚀速率及电偶效应作用距离的影响都是最大的。

关键词： 高速列车; 异种金属焊接; 焊接接头; 腐蚀电偶效应

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李永红, 邵晓锋, 宋嘉良, 胡添奇, 白子恒, 高瑾, 肖葵 . 异种金属焊接接头不同环境下的腐蚀敏感性研究[J]. 材料保护, 2022 , 55(10) : 76 -81 . DOI: 10.16577/j.issn.1001-1560.2022.0279

Abstract

In order to study the galvanic corrosion sensitivity of welded joints between dissimilar metals for typical structures of type A EMU in five regional corrosion environment simulation fluids,the ER 309L Si was selected to weld 304 stainless steel and Q345 carbon steel (two dissimilar metals).The weld samples were immersed in solutions simulating the environments of Beijing,Zhengzhou,Wuhan,Guangzhou and Wanning respectively for 120 d.The corrosion rate and corrosion potential of different positions of weld samples were analyzed by electrochemical test after corrosion.After rust removal,the microscopic morphology of the samples was observed and the galvanic effect between the weld and the base metal was analyzed.Results showed that in the simulated solutions of 5 regions,the corrosion rates of the base metal and the weld metal were in the order of Wanning >Guangzhou >Wuhan >Zhengzhou >Beijing.Q345 carbon steel and the weld formed a galvanic pair and the former served as an anode,and the action distance of galvanic effect was in the order of Wanning >Zhengzhou >Guangzhou >Beijing >Wuhan.It could be found that the Cl- content in the environment had the greatest influence on the corrosion rate as well as the action distance of the galvanic effect.

Key words： high-speed train; welding of dissimilar metals; welded joint; corrosion; galvanic effect

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