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SRB和CO_2共存环境中X60管线钢腐蚀电化学特征

Wei Liu,Yan Liang Zhao,Minxu Lu

Acta Physico-Chimica Sinica（2008）

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Abstract
对X60管线钢在硫酸盐还原菌(SRB)和CO2共存环境中进行浸泡实验,对浸泡不同时间后的腐蚀形态及膜层的组成进行观察和分析,并对膜层覆盖的X60钢的腐蚀电化学参数特征进行分析.结果表明,SRB吸附形成的微生物膜覆盖程度加大导致X60钢电位正移,腐蚀产物FeS和FeCO3含量增加导致X60钢电位负移.X60钢表面膜层中腐蚀产物含量较低时,仅有一个与电极电位有关的时间常数,当膜层中腐蚀产物的含量高时,增加了与腐蚀产物膜有关的时间常数.在浸泡初期,随微生物膜覆盖程度增加,X60钢的电荷传递电阻增大;随腐蚀产物含量增加,电荷传递电阻先下降后增大.随浸泡时间的延长,X60钢双电层电容和膜层电容均增大.
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Key words
CO2,Corrosion,Corrosion morphology,Electrochemical characteristic,SRB corrosion,X60 pipeline steel
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