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

被引：0
作者：
Xia Li
Haiyan Chen
Pimao Chen
Chuangxing Qing
Huanyuan Li
机构：
[1] Guangdong University of Petrochemical Technology,Faculty of Environmental and Biological Engineering
[2] Guangdong University of Technology,School of Materials and Energy
[3] Chinese Academy of Fishery Science,South China Sea Fisheries Research Institute
来源：
Journal of Materials Engineering and Performance | 2017年 / 26卷
关键词：
aluminum alloy; copper; electrochemical impedance spectroscopy; microbiologically influenced corrosion; salinity; seawater; steel;
D O I：
暂无
中图分类号：
学科分类号：
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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页码：2102 / 2109
页数：7
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