Microbial communities present on mooring chain steels with different copper contents and corrosion rates  

作　　者：WU Jiajia GAO Jieyan ZHANG Dun TAN Faqi YIN Jiang WANG Yu SUN Yan LI Ee 

机构地区：[1]Key Laboratory of Marine Environmental Corrosion and Bio-fouling,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China [2]Open Studio for Marine Corrosion and Protection,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266237,China [3]Center for Ocean Mega-Science,Chinese Academy of Sciences,Qingdao 266071,China [4]University of Chinese Academy of Sciences,Beijing 100049,China [5]Shanghai Bainite Chain Material Tech Co.Ltd.,Shanghai 200439,China

出　　处：《Journal of Oceanology and Limnology》2020年第2期378-394,共17页海洋湖沼学报（英文）

基　　金：Supported by the National Natural Science Foundation of China(Nos.41806087,51771180);the National Key Research and Development Program of China(No.2016YFB0300604);the Key Research and Development Program of Shandong Province(No.2018GGX104021);the Basic Scientific Research Program of Nantong(No.JCZ18136);the Ao Shan Talents Cultivation Program supported by Qingdao National Laboratory for Marine Science and Technology(No.2017ASTCP-ES02)

摘　　要：Copper has long been utilized as a disinfectant for bacteria,but its impact on microbial communities attached to the steel surface in seawater remains unknown.In the present study,3 mooring chain steels of different copper contents are subjected to a 3-month marine field exposure,and the corrosion rate increases in the order of BR5 steel(without copper)<BR5 CuH steel(0.8%copper)<BR5 CuL steel(0.4%copper).The microbial community results show that copper introduction does not result in an obvious change in microbial quantity,but it alters the diversity,richness,and structure of microbial communities due to the variation in copper-resistance of different species.BR5 CuH steel holds microbial communities with the highest percentage of some well-known corrosive microbes including sulfate-reducing bacteria,sulfuroxidizing bacteria,and iron-oxidizing bacteria,but possesses the lowest community diversity/richness owing to the toxicity of copper.The microbial community diversity/richness is stimulated by the low-copper content of BR5 CuL steel,and this steel also carries an intermediate proportion of such corrosive bacteria.Both well-known corrosive bacteria and microbial community diversity/richness seem to be involved in the corrosion acceleration of copper-bearing mooring chain steels.Copper has long been utilized as a disinfectant for bacteria,but its impact on microbial communities attached to the steel surface in seawater remains unknown.In the present study,3 mooring chain steels of different copper contents are subjected to a 3-month marine field exposure,and the corrosion rate increases in the order of BR5 steel(without copper) < BR5 CuH steel(0.8% copper) < BR5 CuL steel(0.4% copper).The microbial community results show that copper introduction does not result in an obvious change in microbial quantity,but it alters the diversity,richness,and structure of microbial communities due to the variation in copper-resistance of different species.BR5 CuH steel holds microbial communities with the highest percentage of some well-known corrosive microbes including sulfate-reducing bacteria,sulfuroxidizing bacteria,and iron-oxidizing bacteria,but possesses the lowest community diversity/richness owing to the toxicity of copper.The microbial community diversity/richness is stimulated by the low-copper content of BR5 CuL steel,and this steel also carries an intermediate proportion of such corrosive bacteria.Both well-known corrosive bacteria and microbial community diversity/richness seem to be involved in the corrosion acceleration of copper-bearing mooring chain steels.

关 键 词：marine corrosion microbially influenced corrosion microbial community mooring chain steel copper introduction 

分 类 号：Q938[生物学—微生物学]