Abstract
Soluble, loosely bound and tightly bound extracellular polymeric substances (S-EPS, LB-EPS, TB-EPS) of Desulfovibrio vulgaris were extracted to investigate their effects on EH40 steel corrosion in 3.5 wt% NaCl solution. Results showed that three types of EPS with different components have opposite effects on corrosion. S-EPS mainly composed of humic acids adhere to EH40 steel surface to form a passive film and inhibit corrosion. However, proteins are the main components in LB-EPS and TB-EPS, the presence of which accelerates corrosion. Especially for TB-EPS, the anodic and cathodic reactions are both promoted due to binding and catalyzing ability of active protein.
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