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利用Tafel极化曲线和电化学阻抗谱方法研究了X100管线钢在红壤中硫酸盐还原菌(SRB)腐蚀的电化学特征。结果表明,整个实验过程中SRB生理活动提高了红壤中管线钢的腐蚀速率,接菌红壤中管线钢的开路电位低于灭菌红壤土壤浸出液中;SRB生理活动影响管线钢表面腐蚀产物的电容和电阻性质,进而促进管线钢腐蚀过程;这种促进作用在实验后期SRB代谢产物富集时达到最大值;根据本文研究结果,铺设于酸性红壤中的管线钢必须考虑SRB对其腐蚀行为的影响。
The electrochemical characteristics of sulfate-reducing bacteria (SRB) in X100 pipeline steel were studied by Tafel polarization curve and electrochemical impedance spectroscopy (EIS). The results showed that the SRB physiological activities increased the corrosion rate of pipeline steel in red soil during the whole experiment. The open circuit potential of pipeline steel in the red soil was lower than that in the soil of red soil. The SRC physiological activities affected the capacitance and Resistance, and then promoted the corrosion process of pipeline steel. The promotion effect reached the maximum when the SRB metabolites were enriched in the late stage of experiment. According to the results of this paper, the pipeline steel laid in acid red soil must consider the influence of SRB on its corrosion behavior.