Carbon source starvation triggered more aggressive corrosion against carbon steel by the Desulfovibrio vulgaris biofilm

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	Carbon source starvation triggered more aggressive corrosion against carbon steel by the Desulfovibrio vulgaris biofilm
	D. Xu; T. Y. Gu
	2014
发表期刊	International Biodeterioration & Biodegradation
ISSN	0964-8305
卷号	91 页码:74-81
摘要	The study of microbiologically influenced corrosion (MIC) has long been plagued by a lack of clear understanding of MIC mechanisms. In this work, bioenergetics was used to explain why and when sulfate-reducing bacteria (SRB) became aggressive toward carbon steel. Fe2+/Fe-0 and acetate + CO2/C3H5O3-(lactate) have similar reduction potentials at pH 7 (-447 mV vs. -430 mV). Bioenergetically, Fe-0 oxidation releases more energy than lactate oxidation, but Fe-0 cannot provide organic carbons needed for growth. If there is insufficient carbon source that can diffuse from the bulk fluid to an iron surface, sessile cells at the bottom of an SRB biofilm on the surface may suffer from local carbon source starvation. In this work, mature Desulfovibrio vulgaris (ATCC 7757) biofilms initially grown in ATCC 1249 culture medium on C1018 carbon steel coupons were subjected to starvation by switching to fresh culture media with 0% (control), 90%, 99% and 100% less organic carbon, respectively. It was found that 90% and 99% carbon reductions increased weight loss significantly. Experimental data also showed that 90% carbon reduction caused a 10 mu m maximum pit depth, largest among all other cases, while 99% carbon reduction yielded the highest specific weight loss of 0.0019 g/cm(2). (C) 2014 Elsevier Ltd. All rights reserved.
部门归属	[xu, dake] chinese acad sci, inst met res, shenyang 110016, peoples r china. [gu, tingyue] ohio univ, inst corros & multiphase technol, dept chem & biomol engn, athens, oh 45701 usa. ; gu, ty (reprint author), ohio univ, inst corros & multiphase technol, dept chem & biomol engn, athens, oh 45701 usa. ; gu@ohio.edu
关键词	Mic Mechanism Srb Nrb Biofilm Sulfate Reduction Bioenergetics Microbiologically Influenced Corrosion Mitigation Nitrate
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/73453
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	D. Xu,T. Y. Gu. Carbon source starvation triggered more aggressive corrosion against carbon steel by the Desulfovibrio vulgaris biofilm[J]. International Biodeterioration & Biodegradation,2014,91:74-81.
APA	D. Xu,&T. Y. Gu.(2014).Carbon source starvation triggered more aggressive corrosion against carbon steel by the Desulfovibrio vulgaris biofilm.International Biodeterioration & Biodegradation,91,74-81.
MLA	D. Xu,et al."Carbon source starvation triggered more aggressive corrosion against carbon steel by the Desulfovibrio vulgaris biofilm".International Biodeterioration & Biodegradation 91(2014):74-81.