Eutrophication of seawater intensified biocorrosion of copper caused by Desulfovibrio vulgaris biofilm  

作　　者：Shihang Lu Haixia Zhu Jiahao Sun Tingyue Gu Nianting Xue Shiqiang Chen Guangzhou Liu Wenwen Dou 

机构地区：[1]Institute of Marine Science and Technology,Shandong University,Qingdao 266237,China [2]Department of Pharmacology,School of Pharmaceutical Sciences,Cheeloo College of Medicine,Shandong University,Jinan 250100,China [3]Department of Chemical and Biomolecular Engineering,Institute for Corrosion and Multiphase Technology,Ohio University,Athens,OH,45701,USA

出　　处：《Journal of Materials Science & Technology》2024年第27期110-123,共14页材料科学技术(英文版)

基　　金：supported by the National Natural Science Foun-dation of China(Grant Nos.U2106206,42006042,42276212,and 42176043).

摘　　要：Seawater eutrophication increases the abundance of microbial communities and metabolic activities of microorganisms in seawater and potentially impacts microbiologically influenced corrosion(MIC).Copper as a common material in marine structures and nuclear waste containers faces serious MIC problems.This study investigated the copper MIC caused by Desulfovibrio vulgaris in anaerobic artificial seawater(ASW)with four eutrophication levels:pure ASW(PASW),oligotrophication ASW(OASW),mesotrophica-tion ASW(MASW),and eutrophication ASW(EASW).It was found that the copper MIC increased along with the eutrophication level.The higher eutrophication led to an increase in the planktonic and Cu surface sessile D.vulgaris cell counts and H2 S concentration in the headspace of anaerobic vials.The re-sultant weight loss and maximum pitting depth of copper in OASW were 2.0 and 2.4 times those in PASW,while their values in EASW were 2.8 and 4.2 times after 10 d of incubation,respectively.The ex-perimental results combined with a bioenergetic analysis in this study indicated the copper MIC caused by D.vulgaris as belonging to biogenic H2 S corrosion(i.e.,metabolite MIC or M-MIC),which was further confirmed by the identical cytochrome c(Cyt c)(redox-active protein for extracellular electron transfer)expression levels of the planktonic D.vulgaris cells and sessile cells on copper.

关 键 词：Eutrophic seawater Desulfovibrio vulgaris Metabolite-microbiologically influenced corrosion Copper corrosion Cytochrome c 

分 类 号：TG1[金属学及工艺—金属学]