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Microbiologically Influenced Corrosion

Semih Genculu, P.E.

Microbiologically Influenced Corrosion (MIC) is corrosion resulting from the presence and activities of microorganisms. MIC has been documented for metals exposed to seawater, freshwater, distilled water, process chemicals, soil, oil, gasoline, airfcraft fuels, and sewage. It has been encountered in chemical, food, pulp and paper processing, nuclear power generation, oil and marine industries and fire protection systems. Most of the time MIC does not produce a unique type of corrosion. It is typically localized and can take the form of pitting, crevice, underdeposit corrosion, and de-alloying. No single factor is responsible for MIC propagation in a water system. To evaluate the potential for MIC in a system, several factors must be considered. The “as built” engineering information is one of the basic requirements for system analysis. Other pertinent information includes materials of construction used, fabrication techniques, operating history, water chemistry, environmental conditions, and any available microbiological history. All of these factors need to be considered before an effective prevention or mitigation program can be instituted.

This course includes a multiple-choice quiz at the end, which is designed to enhance the understanding of the course materials.

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