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题名: Interpreting microbiologically assisted cracking with E-e-pH diagrams
作者: Wu, TQ;  Sun, C;  Ke, W
发表日期: 2018-4-1
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.
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Recommended Citation:
Wu, TQ,Sun, C,Ke, W. Interpreting Microbiologically Assisted Cracking With E-e-ph Diagrams[J]. Bioelectrochemistry,2018,120:57-65.

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