Which term describes the growth of organisms within plant components and is not considered a corrosion mechanism?

• A. Biofouling
• B. Erosion
• C. Microbial-induced corrosion
• D. Sedimentation

Answer: (A)

Biofouling describes the growth and accumulation of organisms on internal surfaces of plant components, often forming biofilms that clog lines and affect flow and heat transfer. This is a biological fouling phenomenon, not a chemical or electrochemical deterioration of the material, so it isn’t classified as a corrosion mechanism. Microbial-induced corrosion is the actual corrosion process where microbes contribute to material loss, so it fits under corrosion, not under general organism growth. Erosion is the physical wearing away of material by fluid flow, and sedimentation is the settling of particles; neither describes living organisms growing on surfaces. Therefore, the term that fits the description is biofouling.