几种超级不锈钢在模拟低温多效海水淡化环境中的点蚀行为研究  

Pitting Corrosion of Several Super Stainless Steels in a Simulated Water Environment of Low Temperature Multi Effect Desalination Unit

作　　者：王长罡[1] 赵林[1] 伍立坪 薛芳[1] 郝雪卉[1] 董俊华[1] 柯伟[1] WANG Changgang;ZHAO Lin;WU Liping;XUE Fang;HAO Xuehui;DONG Junhua;KE Wei(Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]中国科学院金属研究所,沈阳110016

出　　处：《腐蚀科学与防护技术》2018年第4期339-345,共7页Corrosion Science and Protection Technology

基　　金：国家高技术研究发展计划(2015AA034301);国家重点研发计划(2017YFB0702302)~~

摘　　要：在温度分别为20,40和70℃的2倍浓缩海水模拟溶液中,利用循环伏安曲线测试和SEM观察研究,对316不锈钢和超级不锈钢904L、254sMo以及2507的极化行为和表面点蚀形貌进行了研究。结果表明,在该环境中,升高温度可降低316、904L、254sMo和2507等4种不锈钢表面钝化膜的稳定性并提高其点蚀敏感性。在不同温度中,316不锈钢表面均发生严重点蚀损伤,而254sMo和2507不锈钢表面均无明显点蚀迹象。在低温时,904L不锈钢钝化膜击穿电位较高,点蚀坑尺寸较小,点蚀倾向较低;在高温时,其点蚀电位显著降低,点蚀坑尺寸明显增大,点蚀倾向较大。The pitting corrosion behavior of stainless steels 316, 904 L, 2507 and 254 sMo in a twofold condensate sea water at different temperature was investigated, which aims to simulate the water environment encountered in low temperature multi effect desalination unit, by means of electrochemical cyclic polarization test and SEM. Results show that the increase of temperature can reduce the stability of passivation films of stainless steels 316, 904 L, 254 sMo and 2507 and increase their pitting sensitivity. Serious pitting corrosion occurred on the surface of 316 stainless steel at different temperatures, while no obvious pitting corrosion was found on stainless steels 254 sMo and 2507. At low temperature, the stainless steel 904 L presented higher pitting potential, smaller pitting size and lower pitting tendency. However, at high temperature, its pitting potential decreased significantly, pitting size increased and pitting corrosion tendency became larger.

关 键 词：超级不锈钢 海水淡化 高浓缩海水 钝化膜稳定性 点蚀 

分 类 号：TG174[金属学及工艺—金属表面处理]