Microbiologically influenced corrosion (MIC) is a type of corrosion affected by the activity of the microorganism. The attachment of microorganisms and biofilm adhesion are strongly related to the metal surface finish. This makes the influence of MIC more aggressive as the roughness increases. In this study, the effect of different surface roughness on corrosion rate of X65 carbon steel and stainless steel 304 and 306 was studied. The corrosion properties were compared using electrochemical testing such as potentiodynamic polarization method and electrochemical impedance spectroscopy. The weight loss of the steel samples in seawater for a 47-day period and in seawater with Scenedesmus oblique algae for 31-day periods was assessed. In addition, a qualitative assessment for corrosion was done via optical microscopy. Corrosion was highest on carbon steel with the rougher surface of 60 grit and lowest in the smoother surface of 800 grit. Carbon steel was highly susceptible to corrosion while stainless steel had the best corrosion resistance.

Subject
Algae, Steel surfaces, Water, Corrosion rate, Roughness, Seawater, Biofilms, Carbon steel, Immersion, Stainless steel, Steel grit, Microorganisms, Microbiologically influenced corrosion
Keywords:
Biocorrosion, biofilm, microbiologically influenced corrosion, carbon steel, stainless steel, Scenedesmus oblique, algae
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2023
Association for Materials Protection and Performance (AMPP)
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