کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7704704 1496893 2018 32 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Interpreting microbiologically assisted cracking with Ee-pH diagrams
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Interpreting microbiologically assisted cracking with Ee-pH diagrams
چکیده انگلیسی
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 Ee-pH diagrams. Under the combined actions of SRB/NRB and external stress, the cell potential (Ecell) 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Bioelectrochemistry - Volume 120, April 2018, Pages 57-65
نویسندگان
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