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P. Linhardt:
"Cathodic properties of biomineralized manganese dioxide in the corrosion of stainless steel";
Talk: EUROCORR, Lissabon, Portugal; 2005-09-08; in: "Proceedings of EUROCORR 2005, paper no. 277, ECF event no. 273", (2005), 1 - 6.

Microbially influenced corrosion by manganese oxidizing microorganisms (MIC by MOMOs)is a corrosion phenomenon occuring in freshwater systems affecting stainless steels. Typically, cloride induced corrosion is observed at chloride concentrations normally not considered as critical. The initiation of corrosion is attributed to an anodic shift of the open circuit potential of the passive stainless steel caused by manganese dioxide, biomineralized by specific organisms. However, not only the potential of the passive steel seems to be of interest. For stabilization of localized corrosion, the ability of the cathodic reaction to drive enough current for promoting the switch from metastabile pitting to stable pit growth is considered important. Consequently, experiments have been carried out in order to compare the dynamic cathodic properties of normal oxygen reduction reacting with that of biofilm incorporation biomineralized MnO₂. The results indicate a significantly better cathodic performance of such biofilm which migth explain the fast and extensive damages oserved in certain cases of MIC by MOMOs.

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