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Microbiologically Influenced Corrosion (MIC)
Microbiologically Influenced Corrosion - corrosion affected by the presence or activity, or both, of microorganisms. [1]
At various times, MIC has also been termed: Microbial Corrosion - Microbially Induced Corrosion - Microbially Influenced Corrosion - Biologically Influenced Corrosion.
Microorganisms can alter the corrosion of various materials, including polymers, metals, concrete, etc. Microorganisms have been linked to corrosion since the early 1900's. No metal is immune to the presence of microbial colonization. The detrimental effect may be related to: the presence of the microorganism (oxygen or ionic concentration cells) - the biological products it produces (often acidic) - or to both. In addition, the surface film produced by the microorganism may form a niche that permits the production of detrimental anaerobic microorganisms.
Fungi have been implicated in the degradation of various materials - including polymers - but are infrequently involved in metallic corrosion. Nevertheless, one classic case of corrosion related to fungi is the corrosion of the internal wing tanks in aircraft. Fungal growth may occur in the water left in tanks. The fungus can come into contact with the metal as the fuel is consumed. The integrity of the passive film on aluminum may be compromised by the acidic metabolites produced by Hormoconis Resinae.
Another common occurrence is the degradation of concrete in sewer systems resulting from sulfur-oxidizing Thiobacilli. Degradation progresses through a number of steps, and eventually Thiobacillus Thiooxidans produces sulfuric acid from elemental sulfur. Final pHs well below 1.0 have been observed.
At various times, MIC has also been termed: Microbial Corrosion - Microbially Induced Corrosion - Microbially Influenced Corrosion - Biologically Influenced Corrosion.
Microorganisms can alter the corrosion of various materials, including polymers, metals, concrete, etc. Microorganisms have been linked to corrosion since the early 1900's. No metal is immune to the presence of microbial colonization. The detrimental effect may be related to: the presence of the microorganism (oxygen or ionic concentration cells) - the biological products it produces (often acidic) - or to both. In addition, the surface film produced by the microorganism may form a niche that permits the production of detrimental anaerobic microorganisms.
Fungi have been implicated in the degradation of various materials - including polymers - but are infrequently involved in metallic corrosion. Nevertheless, one classic case of corrosion related to fungi is the corrosion of the internal wing tanks in aircraft. Fungal growth may occur in the water left in tanks. The fungus can come into contact with the metal as the fuel is consumed. The integrity of the passive film on aluminum may be compromised by the acidic metabolites produced by Hormoconis Resinae.
Another common occurrence is the degradation of concrete in sewer systems resulting from sulfur-oxidizing Thiobacilli. Degradation progresses through a number of steps, and eventually Thiobacillus Thiooxidans produces sulfuric acid from elemental sulfur. Final pHs well below 1.0 have been observed.
Microbiologically Influenced Corrosion - corrosion affected by the presence or activity, or both, of microorganisms. [1]
At various times, MIC has also been termed: Microbial Corrosion - Microbially Induced Corrosion - Microbially Influenced Corrosion - Biologically Influenced Corrosion.
Microorganisms can alter the corrosion of various materials, including polymers, metals, concrete, etc. Microorganisms have been linked to corrosion since the early 1900's. No metal is immune to the presence of microbial colonization. The detrimental effect may be related to: the presence of the microorganism (oxygen or ionic concentration cells) - the biological products it produces (often acidic) - or to both. In addition, the surface film produced by the microorganism may form a niche that permits the production of detrimental anaerobic microorganisms.
Fungi have been implicated in the degradation of various materials - including polymers - but are infrequently involved in metallic corrosion. Nevertheless, one classic case of corrosion related to fungi is the corrosion of the internal wing tanks in aircraft. Fungal growth may occur in the water left in tanks. The fungus can come into contact with the metal as the fuel is consumed. The integrity of the passive film on aluminum may be compromised by the acidic metabolites produced by Hormoconis Resinae.
Another common occurrence is the degradation of concrete in sewer systems resulting from sulfur-oxidizing Thiobacilli. Degradation progresses through a number of steps, and eventually Thiobacillus Thiooxidans produces sulfuric acid from elemental sulfur. Final pHs well below 1.0 have been observed.
At various times, MIC has also been termed: Microbial Corrosion - Microbially Induced Corrosion - Microbially Influenced Corrosion - Biologically Influenced Corrosion.
Microorganisms can alter the corrosion of various materials, including polymers, metals, concrete, etc. Microorganisms have been linked to corrosion since the early 1900's. No metal is immune to the presence of microbial colonization. The detrimental effect may be related to: the presence of the microorganism (oxygen or ionic concentration cells) - the biological products it produces (often acidic) - or to both. In addition, the surface film produced by the microorganism may form a niche that permits the production of detrimental anaerobic microorganisms.
Fungi have been implicated in the degradation of various materials - including polymers - but are infrequently involved in metallic corrosion. Nevertheless, one classic case of corrosion related to fungi is the corrosion of the internal wing tanks in aircraft. Fungal growth may occur in the water left in tanks. The fungus can come into contact with the metal as the fuel is consumed. The integrity of the passive film on aluminum may be compromised by the acidic metabolites produced by Hormoconis Resinae.
Another common occurrence is the degradation of concrete in sewer systems resulting from sulfur-oxidizing Thiobacilli. Degradation progresses through a number of steps, and eventually Thiobacillus Thiooxidans produces sulfuric acid from elemental sulfur. Final pHs well below 1.0 have been observed.
[1] NACE/ASTM G193-10b Standard Terminology and Acronyms Relating to Corrosion, 2010. All rights reserved by NACE. (Reprinted with Permission)
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Page last updated: 12/16/23