Which statement best describes biofouling in plant components?

• A. Biofouling is not a corrosion mechanism
• B. Biofouling can contribute to corrosion in some cases
• C. Biofouling is the primary driver of corrosion in all systems
• D. Biofouling is not a corrosion mechanism

Answer: (D)

Biofouling on plant components can influence corrosion by creating microenvironments that accelerate metal deterioration. When surfaces are coated with biofilms, microorganisms can alter local chemistry—producing acidic metabolites, trapping corrosive ions, or generating differential oxygen levels—that boost corrosion processes in specific conditions. Because of these effects, biofouling can contribute to corrosion in some cases. It isn’t universal or always the main driver—many systems corrode due to abiotic factors like salt, pitting, or galvanic coupling without a major role for biofouling. It’s also not accurate to say biofouling is never a corrosion mechanism, since microbial-induced corrosion is a well-documented pathway.