The effect of urea on microbiologically induced corrosion (MIC) of carbon steel in soil was investigated using weight-loss measurement, electrochemical polarization, and electrochemical impedance spectroscopy (EIS). Urea tends to accelerate corrosion of carbon steel in inoculated soils and inhibit corrosion in sterile soils. In inoculated soils, FeS2 was detected in corrosion products because of the presence of sulfate-reducing bacteria (SRB). The EIS results showed that the process was controlled by concentration polarization in the later stages.
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