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Corrosion Control of Mild Steel by Aerobic Bacteria Under Continuous Flow Conditions

by K M Ismail, T Gehrig, A Jayaraman, T K Wood, K Trandem, P J Arps, J C Earthman
Corrosion ()

Abstract

Corrosion of mild steel under aerobic conditions in the pres ence of a monoculture of aerobic bacteria (Pseudomonas fragi K [P. fragi K]) has been studied in a continuous flow system using electrochemical impedance spectroscopy (EIS). P. fragi K grown in Luria-Bertani (LB) medium causes a 10- to 20-fold decrease in the corrosion rate of mild steel after a biofilm becomes visible on the surface of the samples. Live viable bacteria are necessary for the observed corrosion reduction of mild steel, indicating an active role rather than a barrier effect of the biofilm. Flowing nitrogen through the solution was found to be less effective than P. fragi K in lowering the corrosion rate of mild steel, suggesting that an effect by bacteria in addition to scavenging oxygen is involved

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