几种超级不锈钢在模拟烟气脱硫环境中的缝隙腐蚀行为研究  

Crevice Corrosion Behavior of Several Super Stainless Steels in a Simulated Corrosive Environment of Flue Gas Desulfurization Process

作　　者：王长罡[1] 魏洁[1] 魏欣[1] 穆鑫[1] 薛芳[1] 董俊华[1] 柯伟[1] 李国平[2] WANG Changgang;WEI Jie;WEI Xin;MU Xin;XUE Fang;DONG Junhua;KE Wei;LI Guoping(Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;Technology Center of Taiyuan Iron and Steel Group Co.Ltd.,Taiyuan 030003,China)

机构地区：[1]中国科学院金属研究所,沈阳110016 [2]山西太钢不锈钢股份有限公司,太原030003

出　　处：《中国腐蚀与防护学报》2019年第1期43-50,共8页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(51071160);国家高技术研究发展计划(2015AA034301)~~

摘　　要：在70℃的死亡绿液中,对316不锈钢以及超级不锈钢904L,254sMo和2507的人造缝隙电极进行了循环伏安测试和腐蚀形貌观察。结果表明,在70℃的死亡绿液中,254sMo和2507不锈钢具有良好的耐缝隙腐蚀能力,316和904L不锈钢的缝隙腐蚀损伤均十分严重。在缝隙边缘,316和904L不锈钢均呈现"蕾丝盖"结构,254sMo和2507不锈钢未见该腐蚀形貌。在缝隙腐蚀坑底部,超级双相不锈钢2507呈现电偶腐蚀的形貌特征。The crevice corrosion of 316, 904L, 254sMo and 2507 stainless steels in a liquid of the so called green death at 70 ℃, which aims to simulate the corrosive environment of flue gas desulfurization process, was comparatively investigated by means of electrochemical cyclic polarization test and SEM.The results showed that 254sMo and 2507 stainless steel have excellent resistance to crevice corrosion,while the crevice corrosion induced damage of SS316 and SS904L is serious. The 'lace cover' structures were observed on the edges of the gap of SS316 and SS904L, but not on that of SS254sMo and SS2507.At the bottom of crevice corrosion pit, duplex super stainless steel 2507 exhibits galvanic corrosion characteristics.

关 键 词：超级不锈钢 烟气脱硫 死亡绿液 人造缝隙电极 缝隙腐蚀 

分 类 号：TG172[金属学及工艺—金属表面处理]