Microbial Activities' Influence on Three Kinds of Metal Material Corrosion Behaviors

文献类型: 外文期刊

第一作者: Li, Xia

作者: Li, Xia;Chen, Haiyan;Li, Huanyuan;Chen, Pimao;Qing, Chuangxing

作者机构:

关键词: aluminum alloy;copper;electrochemical impedance spectroscopy;microbiologically influenced corrosion;salinity;seawater;steel

期刊名称:JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE ( 影响因子:1.819; 五年影响因子:1.895 )

ISSN: 1059-9495

年卷期: 2017 年 26 卷 5 期

页码:

收录情况: SCI

摘要: The corrosion behaviors of copper, 6063 aluminum alloy, and Q235 steel were investigated by open-circuit potential (OCP), anodic polarization curve analysis, and electrochemical impedance spectroscopy (EIS). Scanning electron microscopy revealed that a small number of translucent rod-shaped bacterial colonies on the copper surface of copper, whereas plenty of rod-shaped microbes colony were detected on the surface of 6063 aluminum material. Moreover, rod-shaped bacteria and mold colonies attached to the surface of Q235 steel. The decrease in the OCP of copper, 6063 aluminum alloy, and Q235 steel led to higher corrosion tendency. EIS analysis showed that bacteria can reduce the value of AC impedance of copper, the polarization resistance, and the surface resistance, thereby accelerating corrosion. Moreover, the polarization resistance of aluminum alloy in bacterial seawater is lower than that in non-bacterial seawater, indicating the existence of bacteria accelerated the corrosion of 6063 aluminum alloy. The adherence of microbes on Q235 steel surface accelerated the dissolution of the surface layer, and then the passive film is replaced by incompact biofilm layer. Q235 steel corrodes faster under the influence of bacteria because the polarization resistance in bacterial seawater is much lower than that in non-bacterial seawater.

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