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P. Linhardt:
"Twenty years of experience with corrosion failures caused by manganese oxidizing microorganisms";
Materials and Corrosion, 61 (2010), 12; 1034 - 1039.

Manganese oxidizingmicroorganisms are known as ubiquitous species in soil and
fresh water. Their ability to extract dissolved manganese even at minute
concentrations from the water and to biomineralize it asmanganese(III/IV)oxides
makes them potentially relevant for corrosion processes in technical systems
carrying freshwater. These oxides are known as strong oxidants and may act as
catalyst for the oxygen reduction reaction. Thus, they are cathodically active,
possibly driving anodicmetal dissolution processes.The personal experiences over
two decades from failure analysis related to these organisms have indeed shown
that manganese oxidizers may appear in all kinds of freshwater systems. This
paper summarizes observations and conclusions drawn from these cases and
provides an overview on the methods found useful in their investigation.

microbially influenced corrosion, manganese oxidizing bacteria

http://dx.doi.org/10.1002/maco.201005769