1. Key Laboratory of Advanced Marine Materials,Key Laboratory of Marine Environmental Corrosion and Biofouling,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;Open Studio for Marine Corrosion and Protection,Laoshan Laboratory,Qingdao 266237,China;Center for Ocean Mega-Science,Chinese Academic of Sciences,Qingdao 266071,China;University of Chinese Academy of Sciences,Beijing 100049,China
2. Key Laboratory of Advanced Marine Materials,Key Laboratory of Marine Environmental Corrosion and Biofouling,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;Open Studio for Marine Corrosion and Protection,Laoshan Laboratory,Qingdao 266237,China;Center for Ocean Mega-Science,Chinese Academic of Sciences,Qingdao 266071,China
3. Key Laboratory of Advanced Marine Materials,Key Laboratory of Marine Environmental Corrosion and Biofouling,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;Aquatic Biotechnology,University of Duisburg-Essen,Essen 45141,Germany
Sulfate and nitrate reducing bacteria are important culprits for microbiologically influenced corrosion(MIC)using sulfate and nitrate as electron acceptors,respectively.Sulfate and nitrate hold different standard electrode potentials,which may lead to differences in corrosion,but their effects on corrosion by the same bacteria have not been reported.The corrosion of Q235 steel affected by Pseudodesulfovibrio cashew(P.cashew)in the sulfate and nitrate media under carbon starvation was studied.It was found that sulfate and nitrate did not lead to differences in corrosion under abiotic conditions.However,P.cashew promoted corrosion in both cases,and the consumption of H2 was the main mechanism for MIC.In addition,corrosion was more severe in the sulfate media.The higher corrosivity of P.cashew with sulfate as the electron acceptor is closely related to the higher number of sessile cells in the biofilm,higher bacterial motility,more hydrogen production pathways,and the increased gene expression of enzymes related to energy synthesis.
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