Accelerated anaerobic corrosion of electroactive sulfate-reducing bacteria by electrochemical impedance spectroscopy and chronoamperometry |
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| Institution: | 1. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2. SunRui Marine Environment Engineering Co., Ltd., Qingdao 266101, China;1. Electrochemistry, DECHEMA Forschungsinstitut, Theodor Heuss Allee 25, 60486 Frankfurt a. M. Germany;2. Chair of Bioprocess Engineering, University of Kaiserslautern, Gottlieb-Daimler-Str. 49, 67663 Kaiserslautern, Germany;3. Biochemical Engineering, DECHEMA Forschungsinstitut, Theodor Heuss Allee 25, 60486 Frankfurt a. M. Germany;1. National Materials Corrosion and Protection Data Center, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China;2. BRI Southeast Asia Network for Corrosion and Protection (MOE), Shunde Graduate School of University of Science and Technology Beijing, Foshan, Guangdong 528000, China;3. State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi’an, Shaanxi 710077, China;1. Department of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China;2. Department of Chemical and Biomolecular Engineering, Institute for Corrosion and Multiphase Technology, Ohio University, Athens, OH 45701, USA |
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| Abstract: | Many microbial species can use cathodes as electron donors for metabolism. This direct electron transfer (DET) pathway has rarely been proposed in biocorrosion processes. DET from Q235 carbon steel to the sulfate-reducing bacteria (SRB) Desulfovibrio caledoniensis and its effect on the corrosion behavior of carbon steel were investigated in the present study. Electroactive SRB biofilm was found to play a key role in the ennoblement of the corrosion potential (Ecorr) and in the acceleration of the corrosion rate, indicating that SRB mainly affected the cathodic reaction of low carbon steel corrosion. In addition, SRB biofilm obtained electrons from carbon steel electrode polarized at − 0.74 V. These findings present new evidence for DET between SRB biofilm and carbon steels. |
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