Corrosion of pipes made of stainless steel in the process water distribution system of a paper mill was investigated by various analytical and electrochemical methods. The attack was identified as MIC by manganese oxidizing microorganisms. The preferential attack of the heat tinted welds is explained by the potential shift caused by biomineralized MnO2, which prevents repassivation of the stainless steel in the water being relatively low in chloride for the particular alloy.

Subject
Films, Pipe surfaces, Water, Materials, Piping, Repassivation, Repassivation potentials, Inspection, Manganese, Deposit corrosion, Chlorides, Electrodes, Microbiologically influenced corrosion
Keywords:
MIC, ennoblement, manganese dioxide, stainless steel, welds
Government work published by the Association for Materials Protection and Performance (AMPP) with permission of the author(s). Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2004
GOV
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