What is Microbiologically
Influenced Corrosion (MIC)?
- During the past ten years or so, there has been a growing
appreciation for the effects of microbiologically influenced
- An excellent reference work is the "Microbiologically
Influenced Corrosion Handbook" by S. W. Borenstein, P.E.
Industrial Press, Inc. 1994. ISBN 0-8311-3056-3.(You can
learn more about Ms. Borenstein here).
- Both salt water and fresh water.
- Nuclear plants, chemical process plants,
pulp and paper mills.
- Stainless steels and aluminum alloys are
susceptible in general.
- Weldments in aluminum and steel structures
are particular targets.
- Concrete structures are also targets.
- Crown corrosion in a concrete sewer is illustrated
below. Anaerobic chemoheterotrophs produce H2S, which
is absorbed in condensate on the walls above the water
- Aerobic chemolithotrophs oxidize the reduced sulphur to
SO4, forming H2SO4, which attacks and erodes the concrete,
often to the point of structural failure.