Acta Metallurgica Sinica (English Letters) ›› 2023, Vol. 36 ›› Issue (3): 379-390.DOI: 10.1007/s40195-022-01488-2

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Microbiologically Influenced Corrosion Behavior of Fe40(CoCrMnNi)60 and Fe60(CoCrMnNi)40 Medium Entropy Alloys in the Presence of Pseudomonas Aeruginosa

Weiwei Chang1, Yangyang Li1, Huaibei Zheng3, Hongchang Qian1,2(), Dawei Guo4,5, Shuyuan Zhang1,2, Yuntian Lou1,2, Chi Tat Kwok4, Lap Mou Tam4,5, Dawei Zhang1,2()   

  1. 1National Materials Corrosion and Protection Data Center, Institute for Advanced Materials and Technology, 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 528399, China
    3State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan 114002, China
    4Department of Electromechanical Engineering, University of Macau, Macau 999078, China
    5Institute for the Development and Quality, Macau 999078, China

Abstract:

In this work, the microbiologically influenced corrosion (MIC) of Fe40(CoCrMnNi)60 and Fe60(CoCrMnNi)40 medium entropy alloys (MEAs) induced by Pseudomonas aeruginosa (P. aeruginosa) was investigated. Corrosion behaviors during 14 days of immersion in sterile and P. aeruginosa-inoculated culture media are presented. Under sterile conditions, both MEAs exhibited good corrosion resistance against the culture medium solution. In the presence of P. aeruginosa, the pitting corrosion of MEAs was promoted. The results of inductively coupled plasma‒mass spectrometry (ICP‒MS) and potentiodynamic polarization tests showed that the presence of P. aeruginosa promoted the selective dissolution of passive film and accelerated the corrosion of MEAs. The results of X-ray photoelectron spectroscopy (XPS) and Mott-Schottky measurements further demonstrated the degradation effect of P. aeruginosa on the passive film. Compared with Fe60(CoCrMnNi)40, Fe40(CoCrMnNi)60 manifested better resistance to the MIC caused by P. aeruginosa, which may be attributed to more Cr oxides and fewer Fe oxides of the passive film.

Key words: Microbiologically influenced corrosion, Medium entropy alloys, Pseudomonas aeruginosa