Influence of sulfate reducing bacterial biofilm on corrosion behavior of low-alloy,high-strength steel (API-5L X80) |
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| Institution: | 1. Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, CO 80401, USA;2. Department of Civil and Environmental Engineering, Colorado School of Mines, Golden, CO 80401, USA;3. Inspection Department, Saudi Aramco, Dhahran 31311, Saudi Arabia;1. Environmental Corrosion Center, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;1. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;1. Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao 266071, China;2. University of Chinese Academy of Sciences, 19 (Jia) Yuquan Road, Beijing 100049, China;1. Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China;2. Department of Chemical and Biomolecular Engineering, Institute for Corrosion and Multiphase Technology, Ohio University, Athens, OH 45701, USA;1. Environmental Corrosion Center, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;2. School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China;3. Key Laboratory of Materials Design and Preparation Technology of Hunan Province, Xiangtan University, Xiangtan 411105, China;4. Oil-Gas Storage and Transportation Company of Xinjiang Oilfield Branch, Karamay 834002, China;1. Key Laboratory for Large-Format Battery Materials and System, Ministry of Education, Hubei Key Laboratory of Materials Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR 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: | The utilization of high strength carbon steels in oil and gas transportation systems has recently increased. This work investigates microbiologically influenced corrosion (MIC) of API 5L X80 linepipe steel by sulfate reducing bacteria (SRB). The biofilm and pit morphology that developed with time were characterized with field emission scanning electron microscopy (FESEM). In addition, electrochemical impedance spectroscopy (EIS), polarization resistance (Rp) and open circuit potential (OCP) were used to analyze the corrosion behavior. Through circuit modeling, EIS results were used to interpret the physicoelectric interactions between the electrode, biofilm and solution interfaces. The results confirmed that the extensive localized corrosion activity of SRB is due to a formed biofilm and a porous iron sulfide layer on the metal surface. Energy Dispersive Spectroscopy (EDS) revealed the presence of different sulfide and oxide constituents in the corrosion products for the system exposed to SRB. |
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