Effects of metabolic activity of sulphate-reducing bacteria on heterogeneous corrosion behaviors of copper in seawater
Effects of metabolic activity of sulphate-reducing bacteria on heterogeneous corrosion behaviors of copper in seawater
复制标题
硫酸盐还原菌代谢活性对海水中铜异质腐蚀行为的影响
DOI：
10.1002/maco.201709945
复制
发表时间：
2018
影响因子：
1.8
通讯作者：
Zhang Dun
中科院分区：
文献类型：
--
作者：
Chen Shiqiang;Zhang Dun
本文采用线束电极法结合电化学阻抗谱、扫描电子显微镜、X射线光电子能谱等其他分析方法，研究了硫酸盐还原菌（SRB）代谢活性对海水中铜异质腐蚀行为的影响。结果表明，铜的不均匀腐蚀行为与SRB的代谢活性有关，即SRB的代谢活性越高，铜的电流分布越不均匀。特别是，在暴露的第 5 天，阴极和阳极区域的 SRB 细胞表现出不同的微形态。 SRB在阳极区附着在腐蚀产物膜表面，而在阴极区则将自产有机纳米线植入腐蚀产物膜中。这些有机纳米线可以导电，并帮助SRB直接从阴极区域获取电子。 XPS结果表明，当存在高代谢活性的SRB时，阴极区与阳极区腐蚀产物成分的相对含量存在明显差异。
In this paper, wire beam electrode method combined with other analysis methods, that is, electrochemical impedance spectroscopy, scanning electron microscope, and X‐ray photoelectron spectroscopy, was used to investigate effects of metabolic activity of sulphate‐reducing bacteria (SRB) on heterogeneous corrosion behaviors of copper in seawater. Results show that heterogeneous corrosion behaviors of copper are associated with metabolic activity of SRB, that is, the higher metabolic activity of SRB is, the more heterogeneously current of copper distributes. In particularly, on the 5th day of exposure, SRB cells on cathodic and anodic areas display distinct micromorphologies. SRB attach onto corrosion products film surface in anodic area, while they implant in corrosion products film with self‐produced organic nanowires in cathodic area. These organic nanowires may be conductive, and help SRB to obtain electrons from cathodic area directly. The XPS results show that the relative content of corrosion products components on cathodic area is obviously different with that on anodic area when SRB with the high metabolic activity are present.