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Electrochemical Characteristics of SRB Microorganism Induced Corrosion Using Wire Beam Electrode
The corrosion behavior of Q235 low carbon steel in a semi-continuous medium was investigated using two electrodes, focusing on the influence of sulfate-reducing bacteria (SRB) and biofilm formation. The study examined the non-uniform characteristics of biofilms and their impact on electrochemical properties, including open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS), over time. Potential, current, and impedance scanning techniques were employed to analyze these relationships.
It was observed that the open circuit potential shifted negatively as the biofilm developed, indicating a change in the electrochemical environment. This shift is likely due to the metabolic activity of SRB, which produces sulfide—a conductive byproduct that alters the surface conditions. As a result, traditional surface potential scanning methods are no longer reliable for identifying localized corrosion under biofilms. Instead, surface impedance scanning proved more effective in detecting such corrosion phenomena.
Furthermore, EIS analysis revealed that the biofilm exhibited a very high capacitance, ranging from 10ⴠto 10ⵠμF/cm². The membrane capacitance increased over time, following an S-shaped curve, while both solution resistance and charge transfer resistance decreased exponentially. These findings highlight the dynamic nature of biofilm growth and its significant effect on the electrochemical behavior of the metal surface. Understanding these changes is crucial for predicting and mitigating microbial corrosion in industrial environments.