Toward a better understanding of microbiologically influenced corrosion caused by sulfate reducing bacteria

作     者：Tingyue Gu Ru Jia Tuba Unsal Dake Xu 

作者机构：Department of Chemical and Biomolecular EngineeringInstitute for Corrosion and Multiphase TechnologyOhio University School of Materials Science and EngineeringNortheastern University 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2019年第35卷第4期

页      面：631-636页

核心收录：

学科分类：080503[工学-材料加工工程] 0806[工学-冶金工程] 0817[工学-化学工程与技术] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0802[工学-机械工程] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：funding by the National Natural Science Foundation of China (Nos.51501203 and U1660118) the National Basic Research Program of China (973 Program Project,No.2014CB643300) the National Environmental Corrosion Platform (NECP) T.U.is sponsored by a postdoctoral fellowship from The Scientific and Technological Research Council of Turkey (TUBITAK-2219) 

主　　题：Sulfate-reducing bacteria(SRB) Microbiologically influenced corrosion(MIC) Carbon steel Extracellular electron transfer 

摘      要：Sulfate reducing bacteria(SRB) are often the culprits of microbiologically influenced corrosion(MIC) in anoxic environments because sulfate is a ubiquitous oxidant. MIC of carbon steel caused by SRB is the most intensively investigated topic in MIC because of its practical importance. It is also because biogenic sulfides complicate mechanistic SRB MIC studies, making SRB MIC of carbon steel is a long-lasting topic that has generated considerable confusions. It is expedient to think that biogenic H_2S secreted by SRB acidifies the broth because it is an acid gas. However, this is not true because endogenous H_2S gets its H^+ from organic carbon oxidation and the fluid itself in the first place rather than an external source. Many people believe that biogenic H_2S is responsible for SRB MIC of carbon steel. However, in recent years,well designed mechanistic studies provided evidence that contradicts this misconception. Experimental data have shown that cathodic electron harvest by an SRB biofilm from elemental iron via extracellular electron transfer(EET) for energy production by SRB is the primary cause. It has been demonstrated that when a mature SRB biofilm is subjected to carbon source starvation, it switches to elemental iron as an electron source and becomes more corrosive. It is anticipated that manipulations of EET related genes will provide genetic-level evidence to support the biocathode theory in the future. This kind of new advances will likely lead to new gene probes or transcriptomics tools for detecting corrosive SRB strains that possess high EET capabilities.