Abstract

Austenitic stainless steels are susceptible to microbiologically influenced corrosion (MIC) when it is used in contact with natural waters. This is due to the changes in the chemistry of the environment at the metal surface because of the settlement and activities of microorganisms. After introducing the mechanism of microbial mediation in the corrosion of metals and alloys, the paper summarizes the work carried out in our laboratory in the area of MIC of austenitic stainless steels. The thrust of our work was in understanding the changes in the electrochemical behaviour of a type 304 stainless steel in the presence of a natural biofilm as well as the influence of metallurgical characteristics on microbial adhesion and MIC.

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