Interpreting microbiologically assisted cracking with E-e-pH diagrams

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	Interpreting microbiologically assisted cracking with E-e-pH diagrams
	Wu, TQ; Sun, C; Ke, W; Wu, TQ (reprint author), Xiangtan Univ, Sch Mat Sci & Engn, Key Lab Mat Design & Preparat Technol Hunan Prov, Xiangtan 411105, Peoples R China.
刊名	BIOELECTROCHEMISTRY
	2018-04-01
卷号	120 页码:57-65
关键词	Sulfate-reducing Bacteria Stress-corrosion Cracking Near-neutral Ph Duplex Stainless-steel Pseudomonas-aeruginosa Biofilm Desulfovibrio-vulgaris Biofilm X100 Pipeline Steel Carbon-steel Hydrogen Embrittlement Anodic-dissolution
ISSN号	1567-5394
英文摘要	Although many mechanisms have been proposed to explain the microbiologically assisted cracking (MAC) of steel and copper, a theoretical interpretation is necessary. In this paper, we attempt to give a theoretical interpretation of sulfate/nitrate reducing bacteria (SRB/NRB)-assisted cracking using E-e-pH diagrams. Under the combined actions of SRB/NRB and external stress, the cell potential (E-cell) and the corrosion current density of the corrosion reaction increase, such that the corrosion reactions become more thermodynamically favorable. This is the nature of MAC. Nitrate is a far more potent oxidant than sulfate, and thus, the NRB-assisted cracking of iron is a more thermodynamically favorable process than the SRB-assisted cracking. Furthermore, the thermodynamic interpretation is attempted to implicate into the classical stress corrosion cracking mechanisms of pipeline steel. (C) 2017 Elsevier B.V. All rights reserved.; Although many mechanisms have been proposed to explain the microbiologically assisted cracking (MAC) of steel and copper, a theoretical interpretation is necessary. In this paper, we attempt to give a theoretical interpretation of sulfate/nitrate reducing bacteria (SRB/NRB)-assisted cracking using E-e-pH diagrams. Under the combined actions of SRB/NRB and external stress, the cell potential (E-cell) and the corrosion current density of the corrosion reaction increase, such that the corrosion reactions become more thermodynamically favorable. This is the nature of MAC. Nitrate is a far more potent oxidant than sulfate, and thus, the NRB-assisted cracking of iron is a more thermodynamically favorable process than the SRB-assisted cracking. Furthermore, the thermodynamic interpretation is attempted to implicate into the classical stress corrosion cracking mechanisms of pipeline steel. (C) 2017 Elsevier B.V. All rights reserved.
学科主题	Biochemistry & Molecular Biology ; Biology ; Biophysics ; Electrochemistry
语种	英语
资助机构	National Natural Science Foundation of China [51601164, 51471176]; China Postdoctoral Science Foundation [2017M622594]; Xiangtan University Foundation [15ZXZ15]
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79415]
专题	金属研究所_中国科学院金属研究所
通讯作者	Wu, TQ (reprint author), Xiangtan Univ, Sch Mat Sci & Engn, Key Lab Mat Design & Preparat Technol Hunan Prov, Xiangtan 411105, Peoples R China.
推荐引用方式 GB/T 7714	Wu, TQ,Sun, C,Ke, W,et al. Interpreting microbiologically assisted cracking with E-e-pH diagrams[J]. BIOELECTROCHEMISTRY,2018,120:57-65.
APA	Wu, TQ,Sun, C,Ke, W,&Wu, TQ .(2018).Interpreting microbiologically assisted cracking with E-e-pH diagrams.BIOELECTROCHEMISTRY,120,57-65.
MLA	Wu, TQ,et al."Interpreting microbiologically assisted cracking with E-e-pH diagrams".BIOELECTROCHEMISTRY 120(2018):57-65.