Abstract
In this work, the corrosion behavior and mechanism of carbon steel induced by extracellular polymeric substances (EPS) extracted from an iron-oxidizing bacterium culture were studied using surface analysis and electrochemical measurements in 3.5wt% NaCl solutions. Results of electrochemical measurements showed that 7day-old EPS at 240mgL−1 inhibited the corrosion of carbon steel, especially after the EPS solution was heat treated to deactivate the enzymes in the EPS. However, 7day-old EPS at much higher and much lower concentrations accelerated corrosion. Furthermore, 14day-old EPS and 28day-old EPS at 240mgL−1 also accelerated corrosion.
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