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

By Li, Huabing; Yang, Chuntian; Zhou, Enze; Yang, Chunguang; Feng, Hao; Jiang, Zhouhua; Xu, Dake; Gu, Tingyue; Yang, Ke
Published in Journal of Materials Science & Technology NULL 2017

Abstract

Abstract {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 CrO3, which was detrimental to the passive film, resulting in {MIC} pitting corrosion.

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