321不锈钢在淡化海水中的耐腐蚀性能  

Corrosion Behavior of 321 Stainless Steel in Desalinated Seawater

作　　者：吴恒[1] 王佳[1,2] 李超[3] 张波[3] 

机构地区：[1]中国海洋大学化学化工学院,青岛266100 [2]金属腐蚀与防护国家重点实验室,沈阳110015 [3]钢铁研究总院青岛海洋腐蚀研究所,青岛266071

出　　处：《腐蚀科学与防护技术》2012年第3期209-212,共4页Corrosion Science and Protection Technology

摘　　要：采用电化学测试和慢应变速率拉伸(SSRT)方法,结合扫描电镜(SEM)评价321不锈钢在淡化海水中的耐蚀性.循环伏安实验表明,随着温度的升高,点蚀击破电位负移,耐点蚀性能下降;321不锈钢在淡化海水中的临界点蚀温度(CPT)为30.5℃.SSRT实验结果表明,321不锈钢在淡化海水中具有一定的应力腐蚀开裂(SCC)敏感性,随着温度的升高,应力腐蚀敏感性增大.在35℃和50℃,321不锈钢在淡化海水中的断裂为韧性断裂;而在70℃,断口微观形貌呈现韧窝+少量准解理形貌,SCC敏感性增强.Electrochemical measurement, slow strain rate test and SEM observation of fracture surfaces were used to study the corrosion behavior of 321 stainless steel in desalinated seawater. The result of cyclic voltammetry indicates that the pitting potential goes negative with the temperature rising, and thereby the pitting corrosion resistance decreases. Critical pitting temperature （CPT） of 321 stainless steel is 30.5 ℃ in desalinated seawater. SSRT results show that 321 stainless steel is relatively sensitive in desalinated seawater. At 35 ℃ and 50 ℃, 321 stainless steel shows ductile fracture, however the fractured surfaces exhibit ductile plus quasi-cleavage fracture at 70 ℃, and the sensitivity of SCC is inceraesed.

关 键 词：不锈钢 淡化海水 点蚀击破电位 临界点蚀电位 慢应变速率拉伸 

分 类 号：TG142.1[一般工业技术—材料科学与工程]