Electrochemical behavior of antimicrobial stainless steel bearing copper in sulfate reducing bacterial medium

Abstract

The electrochemical characteristic of antimicrobial stainless steel bearing copper NSSAM3 in sulfate reducing bacterial (SRB) was investigated by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. The results show that inoculation of SRB into the culture medium significantly affects the anodic polarization behavior of NSSAM3 and accelerates anodic depolarization process, however, it has little effect on cathodic polarization curves of NSSAM3. Under the same exposure time, the anodic polarization curves of NSSAM3 in culture medium with SRB are in anodic active dissolution state when anodic polarization potential value is below 0 V(SCE), whose anodic polarization current density is bigger than that of in culture medium without SRB. Moreover, when the concentration of Cu²⁺ in SRB medium increases, anodic polarization current density of NSSAM3 decreases and polarization resistance increases with increasing time. Scanning electron microscope (SEM) observations indicate that SRB unevenly attaches on the surface of NSSAM3, and induces the sensitivity to local corrosion.

Keywords

antimicrobial stainless steel / sulfate reducing bacterial / electrochemical characteristic / electrochemical impedance spectroscopy

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