Microbiologically Influenced Corrosion (MIC)
Definition - What does Microbiologically Influenced Corrosion (MIC) mean?
Microbiologically influenced corrosion (MIC) is metal deterioration as a result of the metabolic activity of various microorganisms.
This corrosion is promoted or caused by microorganisms, typically chemoautotrophs. This type of corrosion applies to non-metallic objects as well as metals. For instance, aerobic bacteria such as acidithiobacillus thioxidants can cause significant corrosion as it serves as a factor in biogenic sulfide corrosion.
Microbiologically influenced corrosion is also known as biological corrosion and microbial corrosion.
Corrosionpedia explains Microbiologically Influenced Corrosion (MIC)
There is a wide range of bacteria in water known to provoke MIC in such materials as:
- Stainless steel
- Carbon steel
- Copper alloys
- Aluminum alloys
Various industries that are affected by this type of corrosion include:
- Offshore and onshore gas and oil industries
- Waterflood and mothball systems as well as gas and oil handling systems
- Industries related to chemical processing: flanged joints, tanks made of stainless steel, specifically in welded portions
- Water treatment facilities such as piping and heat exchangers
- Metal working facilities where increased wear, emulsions and machining oils may be present
- Nuclear power plants with stainless and carbon steel tanks and piping as well as aluminum bronze and brass cooling tubes
- Periodic mechanical cleaning
- Chemical treatment using biocides to prevent bacteria population
- Dry storage and total drainage
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