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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.
2018-04-01
Source PublicationBIOELECTROCHEMISTRY
ISSN1567-5394
Volume120Pages:57-65
AbstractAlthough 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.
description.department[wu, tangqing] xiangtan univ, sch mat sci & engn, key lab mat design & preparat technol hunan prov, xiangtan 411105, peoples r china ; [wu, tangqing ; sun, cheng ; ke, wei] chinese acad sci, inst met res, environm corros ctr, shenyang 110016, liaoning, peoples r china
KeywordSulfate-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
Subject AreaBiochemistry & Molecular Biology ; Biology ; Biophysics ; Electrochemistry
Funding OrganizationNational Natural Science Foundation of China [51601164, 51471176]; China Postdoctoral Science Foundation [2017M622594]; Xiangtan University Foundation [15ZXZ15]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79415
Collection中国科学院金属研究所
Corresponding AuthorWu, TQ (reprint author), Xiangtan Univ, Sch Mat Sci & Engn, Key Lab Mat Design & Preparat Technol Hunan Prov, Xiangtan 411105, Peoples R China.
Recommended Citation
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.
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