Susceptibility of Stainless Steel Weldments to Microbiologically Influenced Corrosion

Abstract

ABSTRACTMicrobiologically influenced corrosion (MIC) is the term used for the phenomenon where corrosion is initiated or accelerated by microorganisms. Biofilms of bacteria form on metal surfaces when exposed to natural waters. The activity of these biofilms and how they attach themselves to metal surfaces directly influence corrosion mechanisms.This paper describes the mechanisms for MIC and the factors which influence the susceptibility of austenitic stainless steel weidments to MIC. The metallurgical, microbiological and electrochemical factors that influence MIC are discussed. Case histories of MIC-related failures and field test results of austenitic stainless steel weldments in various welded conditions are presented.