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  

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

作　　者：白强[1,2] 邹妍[2] 孔祥峰[2] 高杨[2] 刘岩[2] 董胜[1] 

机构地区：[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

出　　处：《中国腐蚀与防护学报》2016年第5期427-432,共6页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金项目(51209129)资助

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。The electrochemical corrosion behavior in seawater of weld joints of a high strength lowalloy 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.

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 

分 类 号：O646[理学—物理化学]