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硫酸盐还原菌生物膜下铜镍锡合金的腐蚀行为

陈娟 , 类延华 , 高冠慧 , 孔茉莉 , 尹衍升

中国腐蚀与防护学报

用开路电位法、极化曲线法和电化学阻抗技术研究硫酸盐还原菌(SRB)对铜镍锡合金腐蚀行为的影响。用扫描电镜(SEM)和能谱分析(EDS)观察铜镍锡合金的腐蚀形貌。结果表明,SRB的存在使电极开路电位从-275 mV 负移至-750 mV,较无菌环境中开路电位(-100 mV)下降了650 mV,合金腐蚀加速。扫描电镜观察结果表明,合金表面生成不均匀的生物膜,主要发生点蚀和缝隙腐蚀。能谱分析显示腐蚀产物主要是铜和镍的硫化物,生物膜下铜镍锡合金发生脱镍和脱锡腐蚀。

关键词: 铜镍锡合金 , sulfate-reducing bacteria biofilm , microbiological influenced corrosion , denickelification

The Electrochemical Behavior of Oceanic Microbiological Influenced Corrosion on Carbon Steel

X.T. Chang , Y.S. Yin , G.H. Niu , T. Liu , S. Cheng , S.B. Sun

金属学报(英文版)

The corrosion behavior of carbon steel in the medium of marine microorganisms was investigated by electrochemical impedance spectra, polarization curves, and so on. Experimental results showed that the corrosion potential of carbon steel moved in a negative direction in the unpurified marine microorganism solution, and the polarization style of the cathodic process did not change. The electrochemical impedance spectra showed that the impedance value of the electrode decreased in the medium with bacteria, which indicated that the existence of microorganism could accelerate the corrosion progress of carbon steel.

关键词: carbon steel , null , null

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