Microbiologically Influenced Corrosion of Q235 Carbon Steel by Aerobic Thermoacidophilic Archaeon Metallosphaera cuprina  

作　　者：Hongchang Qian Shangyu Liu Wenlong Liu Pengfei Ju Dawei Zhang 

机构地区：[1]National Materials Corrosion and Protection Data Center,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 528000,China [3]Shanghai Aerospace Equipment Manufacturer,Shanghai 200245,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2022年第2期201-211,共11页金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.52001021);the China Postdoctoral Science Foundation(No.2019M660453);the Postdoctoral Research Foundation of Shunde Graduate School of University of Science and Technology Beijing(No.2020BH009)。

摘　　要：The effect of thermoacidophilic archaeon Metallosphaera cuprina(M.cuprina)on the corrosion of Q235 carbon steel in its culture medium was investigated in this work.In the sterile culture medium,the carbon steels showed uniform corrosion morphologies and almost no corrosion products covered the sample surface during 14 days of immersion test.In the presence of M.cuprina,some corrosion pits appeared on the surface of carbon steels in the immersion test,exhibiting typical localized corrosion morphologies.Moreover,the sample surfaces were covered by a large number of insoluble precipitates during the immersion.After 14 days,the thickness of precipitates reached approximately 50μm.The results of weight loss test and electrochemical test demonstrated that the carbon steels in the M.cuprina-inoculated culture medium had higher corrosion rate than that in the sterile culture medium.The oxygen concentration cell caused by M.cuprina biofilms resulted in localized corrosion behavior,and the ferrous oxidation ability of M.cuprina accelerated the anodic dissolution of carbon steels,thus promoting the corrosion process of carbon steels.

关 键 词：Microbiologically influenced corrosion Carbon steel Electrochemical impedance spectroscopy(EIS) 

分 类 号：TG172.7[金属学及工艺—金属表面处理]