Microbiologically Influenced Corrosion
NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
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The term microbiologically influenced corrosion MIC is used to designate corrosion due to the presence and activities of microorganisms, i.e., those organisms that cannot be seen individually with the unaided human eye, including microalgae, archaea, bacteria, and fungi. Microorganisms can accelerate rates or partial reactions in corrosion processes or shift the mechanism for corrosion. Microorganisms can influence pitting, dealloying, enhanced erosion corrosion, enhanced galvanic corrosion, stress corrosion cracking, and hydrogen embrittlement. Microbiologically influenced corrosion has been reported for all engineering metal and alloys with the exception of predominantly titanium and high chromium -nickel alloys. It has been documented for metals and nonmetals exposed to seawater, freshwater, distilleddemineralized water, crude and distillate hydrocarbon fuels, process chemicals, foodstuffs, soils, human plasma, saliva, and sewage. The following sections describe the estimated costs of MIC, mechanisms, and causative microorganisms contributing to MIC techniques for diagnosing, measuring, and monitoring engineering practices that influence MIC and strategies to prevent or mitigate MIC.
- Test Facilities, Equipment and Methods