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Microbiologically influenced corrosion behavior of S32654 super austenitic stainless steel in the presence of marine Pseudomonas aeruginosa biofilm

查看全文 作　　者：Huabing [1]Li;Chuntian [1]Yang;Enze [1]Zhou;Chunguang [2]Yang;Hao [1]Feng;Zhouhua [1]Jiang;Dake [2]Xu;Tingyue [3]Gu;Ke [2]Yang 高影响力作者 机构地区：[1]School of Metallurgy, Northeastern University;[2]Institute of Metal Research, Chinese Academy of Sciences;[3]Department of Chemical and Biomolecular Engineering, Institute for Corrosion and Multiphase Technology, Ohio University高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2017年第33卷第12期,共8页高影响力期刊 基　　金：financially supported by the High Technology Research and Development Program of China(No.2015AA034301);the National Natural Science Foundation of China(Grant Nos.51304041 and U1660118);Fundamental Research Funds for the Central Universities(Grant No.N150204007) 摘　　要：S32654 super austenitic stainless steel(SASS) is widely used in highly corrosive environments. However,its microbiologically influenced corrosion(MIC) behavior has not been reported yet. In this study, the corrosion behavior of S32654 SASS caused by a corrosive marine bacterium Pseudomonas aeruginosa was investigated using electrochemical measurements and surface analysis techniques. It was found that P. aeruginosa biofilm accelerated the corrosion rate of S325654 SASS, which was demonstrated by a negative shift of the open circuit potential(EOCP), a decrease of polarization resistance and an increase of corrosion current density in the culture medium. The largest pit depth of the coupons exposed in the P.aeruginosa broth for 14 days was 2.83 m, much deeper than that of the control(1.33 m) in the abiotic culture medium. It was likely that the P. aeruginosa biofilm catalyzed the formation of CrO_3, which was detrimental to the passive film, resulting in MIC pitting corrosion. 关 键 词：PSEUDOMONAS 腐蚀行为 微生物学 不锈钢 奥氏体 海洋 地面 表面分析技术
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