Abstract: A comparative study focused on corrosion behavior of Q235 steel in seawater with the absence and presence of sulfate reducing bacteria (SRB) was carried out by using mass loss method, electrode open-circuit potential, electrochemical impedance spectroscopy (EIS) and polarization testing. The results showed that the corrosion current density of Q235 steel increased from 7.49 mA·cm-2 to 9.77 mA·cm-2, then gradually reduced to 5.01 mA·cm-2, and eventually increased to 12.6 mA·cm-2 as the immersion time passed in SRB-containing seawater. The corrosion current density of Q235 in SRB-containing seawater was lower than that of Q235 steel in sterile seawater, and the corrosion of Q235 steel was inhibited by SRB. In SRB-containing seawater, the corrosion behavior of Q235 steel was mainly influenced by Cl- and biofilm. During the stable growth stage of SRB, corrosion rate of the metal is mainly suppressed by biofilm. During exponential growth stage and decline stage of SRB, the effect of biofilm on Q235 steel is weak and corrosion rate of the metal is mainly promoted by Cl-.
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