Acta Metallurgica Sinica (English Letters) ›› 2022, Vol. 35 ›› Issue (2): 201-211.DOI: 10.1007/s40195-021-01239-9

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

Hongchang Qian1,2(), Shangyu Liu1, Wenlong Liu1, Pengfei Ju3(), Dawei Zhang1,2   

  1. 1National Materials Corrosion and Protection Data Center, University of Science and Technology Beijing, Beijing 100083, China
    2BRI Southeast Asia Network for Corrosion and Protection (MOE), Shunde Graduate School of University of Science and Technology, Beijing, Foshan 528000, China
    3Shanghai Aerospace Equipment Manufacturer, Shanghai 200245, China
  • Received:2021-01-07 Revised:2021-01-30 Accepted:2021-03-01 Online:2022-02-10 Published:2021-05-18
  • Contact: Hongchang Qian,Pengfei Ju
  • About author:Pengfei Ju, jupengfei10@163.com
    Hongchang Qian, qianhc@ustb.edu.cn;

Abstract:

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 50 μm. 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.

Key words: Microbiologically influenced corrosion, Carbon steel, Electrochemical impedance spectroscopy (EIS)