采用失重法、开路电位、电化学阻抗谱(EIS)、极化曲线等方法,通过在海洋环境中浸泡不同时间对比分析有无硫酸盐还原菌(SRB)条件下Q235钢的腐蚀电化学特征,研究SRB对Q235钢的腐蚀行为的影响.结果表明,在含SRB的海水中,随着浸泡时间延长,Q235钢的腐蚀电流密度先从7.49 mA·cm-2增加至9.77 mA·cm-2,然后逐渐减小至5.01 mA·cm-2,最终增加至12.6 mA·cm-2,且始终小于相同时间下无SRB海水中的腐蚀电流密度,表明SRB的存在抑制了Q235的腐蚀.在含SRB的海水中,Q235钢的腐蚀行为主要由Cl-和生物膜共同影响.在SRB稳定生长阶段,腐蚀以生物膜抑制为主;在SRB指数生长阶段和衰亡阶段,生物膜抑制作用较弱,以Cl-促进金属腐蚀为主.
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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