普通脱硫弧菌
硫酸盐还原菌
腐蚀
阴极保护
化学
无氧运动
电化学
氢
厌氧菌
碳钢
极化(电化学)
还原电位
脱硫弧菌
无机化学
硫酸盐
电极
细菌
生物
有机化学
物理化学
遗传学
生理学
作者
Marina Shiibashi,Xiao Deng,Waheed Miran,Akimitsu Okamoto
出处
期刊:Environmental Science and Technology Letters
[American Chemical Society]
日期:2020-07-15
卷期号:7 (9): 690-694
被引量:7
标识
DOI:10.1021/acs.estlett.0c00383
摘要
Microbially influenced corrosion (MIC) in anaerobic environments has serious negative impacts on the industry and economy. While cathodic polarization (CP) has been widely used to inhibit abiotic corrosion, its potential applicability on MIC has been scarcely elucidated. Here, we report high MIC suppression by CP and its potential mechanism on a carbon steel electrode with Desulfovibrio vulgaris Hildenborough, a model sulfate-reducing bacterium for MIC. Following MIC associated with FeS2 formation on carbon steel, we initiated CP at −0.5 V (vs the standard hydrogen electrode) for 12 h, which consumed low electricity but resulted in a >80% reduction in the corrosion current for at least 1 week. X-ray photoelectron spectroscopy and transcriptome analyses showed the reduction of FeS2 to FeS and downregulated cell metabolism, respectively, thus suggesting that HS–, produced via the electrochemical reduction of FeS2, deactivated D. vulgaris at −0.5 V. Accordingly, a weaker impact was observed at positive potentials of −0.3 and −0.4 V that scarcely reduced FeS2, and at negative potentials of −0.6 and −0.7 V that reduced FeS2, but produced hydrogen that promotes the growth of D. vulgaris. This potential mechanism suggests the broad applicability of mild negative CP to suppress MIC in an environmentally friendly and cost-effective manner.
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