奥氏体焊条水下湿法焊接CCSE40钢在海水中的腐蚀电化学行为研究

doi:10.11902/1005.4537.2015.206

中国腐蚀与防护学报

2016, Vol. 36

Issue (5): 427-432 DOI: 10.11902/1005.4537.2015.206

本期目录 | 过刊浏览

奥氏体焊条水下湿法焊接CCSE40钢在海水中的腐蚀电化学行为研究

白强^1,²,邹妍²(

),孔祥峰²,高杨²,刘岩²,董胜¹

1. 中国海洋大学工程学院青岛 266100
2. 山东省科学院海洋仪器仪表研究所山东省海洋环境监测技术重点实验室青岛 266001

Electrochemical Corrosion Behavior in Seawater of Weld Joints of CCSE40 Steel Prepared by Underwater WetWelding with Austenitic Welding Rod

Qiang BAI^1,²,Yan ZOU²(

),Xiangfeng KONG²,Yang GAO²,Yan LIU²,Sheng DONG¹

1. College of Engineering, Ocean University of China, Qingdao 266100, China
2. Shandong Provincial Key Laboratory of Ocean Environment Monitoring Technology, Institute of Oceanographic Instrumentation, Shandong Academy of Sciences, Qingdao 266001, China

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摘要:

采用电化学方法结合金相显微镜研究了奥氏体焊条水下湿法焊接的低合金高强钢CCSE40在海水中的腐蚀电化学行为。结果表明,浸泡初期热影响区 (HAZ) 的腐蚀速率最快。随着浸泡时间的增加,母材 (BM) 的腐蚀速率最快。造成这种现象的原因是腐蚀产物不同引起的。浸泡初期,锈层较薄,HAZ与BM的腐蚀产物比较疏松,对溶解氧的扩散影响不大,HAZ的腐蚀速率较快。长期浸泡,HAZ表面生成的锈层非常致密,阻碍了溶解氧的扩散,而BM表面的锈层仍然比较疏松,此时BM腐蚀速率较快。

关键词 ：水下湿法焊接, 腐蚀产物, 腐蚀速率, 微观结构, 极化曲线

Abstract：

The electrochemical corrosion behavior in seawater of weld joints of a high strength low-alloy steel CCSE40, which were prepared by underwater wet welding with austenitic welding rod, was studied by electrochemical methods and metallurgical microscopy. Results indicated that, in the initial immersion stage, the heat affected zone had the highest corrosion rate; and with the increasing immersion time, the corrosion rate of base metal became the highest. The reason was related to the formation of the corrosion products that in the initial stage of immersion, the corrosion product layer was thin and loose, which thus had little influence on the diffusion of dissolved oxygen, thereby the heat affected zone was easy to be corroded. After a period of immersion, the corrosion product layer on the heat affected zone was dense, which could hinder the diffusion of dissolved oxygen, in the meanwhile, the corrosion product layer on the base metal was still loose, and therefore, the base metal was easy to be corroded.

Key words： underwater wet welding corrosion product corrosion rate microstructure polarization curve

基金资助:国家自然科学基金项目 (51209129) 资助

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引用本文:

白强,邹妍,孔祥峰,高杨,刘岩,董胜. 奥氏体焊条水下湿法焊接CCSE40钢在海水中的腐蚀电化学行为研究[J]. 中国腐蚀与防护学报, 2016, 36(5): 427-432.
Qiang BAI, Yan ZOU, Xiangfeng KONG, Yang GAO, Yan LIU, Sheng DONG. Electrochemical Corrosion Behavior in Seawater of Weld Joints of CCSE40 Steel Prepared by Underwater WetWelding with Austenitic Welding Rod. Journal of Chinese Society for Corrosion and protection, 2016, 36(5): 427-432.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2015.206 或 https://www.jcscp.org/CN/Y2016/V36/I5/427

表 1 CCSE40及焊缝金属化学成分

图1 水下湿法焊接接头在海水中浸泡28周除锈前后的表面形貌

图2 CCSE40合金钢BM, HAZ及WZ的微观结构

图3 水下湿法焊接接头不同区域自腐蚀电位随浸泡时间的变化

图4 在海水中浸泡不同时间后WZ, HAZ和BM的极化曲线

图5 HAZ和BM的极化电阻随浸泡时间的变化规律

图6 HAZ和BM的B值和腐蚀速率随浸泡时间的变化曲线

图7 水下焊接接头在海水中浸泡28周HAZ和BM腐蚀产物的XRD谱

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