Corrosion Behavior of High Entropy Alloy FeNiCoCrW0.2Al0.1 in Sulfate-reducing Bacteria Containing Solution

doi:10.11902/1005.4537.2024.084

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (2): 460-468 DOI: 10.11902/1005.4537.2024.084

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Corrosion Behavior of High Entropy Alloy FeNiCoCrW_0.2Al_0.1 in Sulfate-reducing Bacteria Containing Solution

XU Jingxiang¹, HUANG Ruiyang¹, CHU Zhenhua¹(

), JIANG Quantong²(

)

^1.College of Engineering Science and Technology, Shanghai Ocean University, Shanghai 201306, China
^2.CAS Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266404, China

Cite this article:

XU Jingxiang, HUANG Ruiyang, CHU Zhenhua, JIANG Quantong. Corrosion Behavior of High Entropy Alloy FeNiCoCrW_0.2Al_0.1 in Sulfate-reducing Bacteria Containing Solution. Journal of Chinese Society for Corrosion and protection, 2025, 45(2): 460-468.

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Abstract

Marine corrosion has always been a major challenge constraining the effective development and utilization of marine resources, among which microbiologically influenced corrosion (MIC) occupies an extremely important position. As an emerging alloy material, high entropy alloys (HEAs) show significant potential in inhibiting MIC due to their unique high mixed entropy properties. Herein, a HEA FeNiCoCrW_0.2Al_0.1 was designed and prepared, and then its corrosion behavior in sulfate-reducing bacteria (SRB) containing solutions was assessed with particular attention to the process of passivation film formation. The results showed that the HEA formed a double-layered passivation film in SRB solution, and the main component of the outer layer was Cr₂O₃, which had strong protective properties. However, the corrosion resistance of the HEA in the SRB solution was reduced compared with that in the sterile medium. This phenomenon may be related to the biological activities of SRB and the direct effect of their metabolites, which promote biofilm formation and weaken the original passivation film, resulting in the impaired corrosion resistance of the alloy. Based on the theory of cathodic depolarization, a mechanism for the passivation film formation of HEAs in SRB solution was proposed, and the influence of biofilm on the protective efficacy of the passivation film on the alloy was further analyzed.

Key words: HEA SRB MIC passivation film biofilm

Received: 16 March 2024 32134.14.1005.4537.2024.084

TG174

Fund: National Natural Science Foundation of China(51872072);Shanghai Natural Science Foundation(20ZR1424000)

Corresponding Authors: CHU Zhenhua, E-mail: zhchu@shou.edu.cn;
JIANG Quantong, E-mail: jiangquantong@qdio.ac.cn

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.084 OR https://www.jcscp.org/EN/Y2025/V45/I2/460

Fig.1 Microstructural characterization (a) and XRD pattern (b) of FeNiCoCrW_0.2Al_0.1 HEA

Fig.2 FM images of FeNiCoCrW_0.2Al_0.1 HEA immersed in SRB solution for 1 d (a), 2 d (b), 3 d (c) and 5 d (d)

Fig.3 SEM surface morphologies of FeNiCoCrW_0.2Al_0.1 HEA after immersion in SRB solution for 9 d and 24 d (a, b), and then removal of biofilm and corrosion products (c, d), respectively

Fig.4 Polarization curves of FeNiCoCrW_0.2Al_0.1 HEA in SRB solution and sterile medium solution

Table 1 Fitting electrochemical parameters of polarization curves and estimated corrosion rates

Fig.5 Equivalent circuit model for fitting EIS data

Fig.6 Nyquist (a) and Bode (b) plots of FeNiCoCrW_0.2Al_0.1 HEA after immersion in SRB solution for 9 and 24 d

Table 2 Fitting parameters of EIS and estimated thicknesses of passivation films for FeNiCoCrW_0.2Al_0.1 HEA after immersion in SRB solution for 9 and 24 d

Fig.7 XPS fine spectra and peak fitting results of Fe (a), Ni (b), Co (c), Cr (d), W (e), Al (f) and O (g) on the surface of FeNiCoCrW_0.2Al_0.1 HEA immersed for 24 d

Fig.8 XPS fine spectra and peak fitting results of Fe (a), Ni (b), Co (c), Cr (d), W (e), Al (f) and O (g) at the depth of 4 nm from the surface of FeNiCoCrW_0.2Al_0.1 HEA immersed for 24 d

Table 3 XPS peak positions and possible oxidation states of as-detected seven elements

Fig.9 Relative fractions and corresponding oxidation states of various elements detected in the passivation film formed on FeNiCoCrW_0.2Al_0.1 HEA during immersion in SRB solution

Fig.10 Schematic diagram of the formation of passivation film on FeNiCoCrW_0.2Al_0.1 HEA during immersion in SRB solution

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