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Microbially Induced Corrosion (MIC) - Coggle Diagram
Microbially Induced Corrosion (MIC)
Predominant types
Sulfate-Reducing Bacteria (SRB)
converts sulfate ions to sulfides (including hydrogen sulfide)
Iron-Related Bacteria (IRB)
converts soluble iron ions (ferrous) to insoluble iron ions (ferric)
Low Nutrient Bacteria (LNB)
LNB growth will form slimes and deposits which creates host sites where other MIC bacteria can grow
Anaerobic Bacteria
grow in the presence of free oxygen
Aerobic Bacteria
grow in the absence of abundant free oxygen
Microorganisms associated with corrosion damage
Aerobic bacteria that produce corrosive mineral acids.
Fungi that may produce corrosive by products in their metabolism, such as organic acids
Slime that formed may produce concentration corrosion cells on surfaces.
The pH conditions and availability of nutrients also play a role in determining what type of microorganisms can thrive in a particular soil environment
Apart from metals and alloys the microorganisms by products can also degrade concrete, organic coatings and wood
anaerobic bacteria that produce highly corrosive species as part of their metabolism
Types of corrosion induced by microbes
Differential aeration corrosion
Pitting corrosion by SRB
Preventative Maintenance
check for and remove water regularly
check for microbial contamination
Testing
Visual observation
Fuel sample that are clear and bright can still have microbially contaminated suspended water
be proactive about using a microbicides
Minimizing MIC
Routine inspections
clean environment
design of the barge
barrier system
chemical treatment through green chemistry
maintain the coating system
dehydration and clean environment
Identify MIC
chemical test
biological
metallurgical