Additionally called bacterial corrosion, microbial corrosion, bio-corrosion, microbially promptedcorrosion (MIC), or microbiologically influenced corrosion, is a type of corrosion that is promoted or caused by types of microorganisms, usually chemoautotrophs. These microorganisms corrode both metals as well as non-metals. An estimated 40% of internal corrosion is impacted by MIC in nearly all industries, and can cause tremendous production loss, O&M costs, equipment determination and safety, potential health, and environmental consequences of corrosion from deterioration. Microbiologically influenced corrosion is caused by a dozen types of bacteria that known to cause corrosion in stainless steel, carbon steels, copper as well as aluminum alloys in soil and water that hold a temperature of 10°C-50°C and pH of 4-9. The listed classification of these bacteria are aerobic and require oxygen to become active or anaerobic which becomes toxic when the bacteria is exposed to oxygen. Anaerobic bacteria which also are sulphate reducing bacteria (SRB), are responsible for most accelerated offshore and ship steel structures corrosion damages. Frequently, oxidizing aerobic manganese and iron are associated with accelerated stainless steel and weld pitting attacks.
The key to warding off a problem is to comprehend the dynamics of microbes because there is no special kind of corrosion produced by (MIC) microbial-induced corrosion. In many aqueous cleansing systems, microbes thrive below the equal conditions and need heat and food supply to furnish moisture, energy, and on occasion oxygen. However, some more difficult micro organisms related to MIC do not require or tolerate oxygen. Conditions such as average temperatures and close to neutral pH, that can also be viewed to be safer for workers can be more favorable towards microbial growth increasing the chances of MIC. Usually, bacteria microbe meals can be with oil, organic compounds, or host metal itself. Iron bacteria use iron as a strength supply and can attack stainless steel and Sulfur-reducing bacteria can attack fluids containing sulfur which can release sulfuric acid that eats away at metal surfaces. Cocoon-like bio films can be produced by some microbes. Elements may become disadvantaged in the areas under the films square measure because they are protected from aerated water. Benefit could be taken by anaerobic bacterium because of different food or underlying metal. Corrosive tactics proceed because albeit anaerobic bacterium allow oxygen-deprived areas to become electrode in contrast to the encircling metal.
Anaerobic bacteria exists in layers of the inner areas of the corrosion deposits. Aerobic bacteria inhabit the outer parts. Hydrogen formed during the process of cathodic corrosion can be utilized by some bacteria. Galvanic corrosion can be caused and enhanced by bacterial colonies forming concentration cells and microbial corrosion can be combated by corrosion inhibitors. Common in the oilfield business are benzalkonium chloride that are formulae based. Microbial corrosion can be applied to materials such as concrete, plastics, and many others. Nylon-eating bacteria and Plastic-eating bacteria are two examples of plastic eating bacteria.
