Primary Research on Corrosion Protection of 304 SS（06Cr19Ni10） Cathode in Benthic Sediment Microbial Fuel Cell

304 Stainless steel (06Cr19Ni10) is protected as a cathode in a benthic sediment microbial fuel cell and its corrosion performance is primarily investigated in this paper. The potential of 304 SS in natural seawater is about -260 mV, and the SS with protection about -340 mV. Fluorescence microscope and scanning electric microscope observation results show that there are no differences in the number of microorganisms on the surface of SS between the protected and unprotected sample but that the protected SS has a low corrosion rate. Electrochemical impedance spectroscopy (EIS) and polarization curve are measured, and the protected SS has a higher impedance value and a lower corrosion current density (Icorr) than the blank sample does. The results show that BMFC has a protection effect on the corrosion of 304SS. This research could be used as a new protection method against metallic corrosion in sea.