Research Progress on Corrosion Resistance of High-entropy Alloys

doi:10.11902/1005.4537.2023.391

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (5): 1100-1116 DOI: 10.11902/1005.4537.2023.391

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Research Progress on Corrosion Resistance of High-entropy Alloys

CHENG Yonghe¹^,², FU Junwei²^,³(

), ZHAO Maomi², SHEN Yunjun¹

1 School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530006, China
2 Marine Corrosion Protection Research Institute of Guangxi Academy of Sciences, Nanning 530007, China
3 Key Laboratory of Advanced Marine Materials, Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China

Cite this article:

CHENG Yonghe, FU Junwei, ZHAO Maomi, SHEN Yunjun. Research Progress on Corrosion Resistance of High-entropy Alloys. Journal of Chinese Society for Corrosion and protection, 2024, 44(5): 1100-1116.

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Abstract

Compared with traditional alloys, high-entropy alloys display bettercorrosion resistance, high-temperature wear resistance and comprehensive mechanical properties. Thus, high-entropy alloys can find their applications in some harsh environments where traditional alloys may not satisfy the requirements. This work focuses on the corrosion resistance of high-entropy alloys. The influence of commonly used alloying elements on the corrosion resistance of high-entropy alloys with BCC, FCC, FCC+BCC and HCP crystal structures in sodium chloride and acidic solution media was discussed. The effect of the interaction between metal elements on corrosion resistance of high-entropy alloys was briefly explained. The influence of grain size, dislocation density, and crystal structure on the corrosion resistance of high-entropy alloys was also discussed. The results show that the corrosion resistance of high-entropy alloys can be improved by increasing grain size or reducing dislocation density. Several methods for improving the corrosion resistance of high-entropy alloys such as heat treatment and anodizing treatment, as well as application of corrosion inhibitor, were summarized. Finally, suggestions and prospects for the future development of high-entropy alloys were put forward.

Key words: high-entropy alloy corrosion resistance harsh environment microstructure alloy element

Received: 20 December 2023 32134.14.1005.4537.2023.391

ZTFLH:

TG174.2

Fund: Startup Funding Project of Institute of Oceanology, Chinese Academy of Sciences(E12822101Q);Guangxi Key R&D Plan (Guike AB23026059)

Corresponding Authors: FU Junwei, E-mail: hitfujw@163.com

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	ZHAO Maomi
	SHEN Yunjun

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.391 OR https://www.jcscp.org/EN/Y2024/V44/I5/1100

Fig.1 Variations of the stabilities of FCC and BCC phases for various HEA systems with VEC^[37]

Fig.2 Surface morphologies of Al_{2 -}_x CoCrFeNiTi _x HEAs after polarization in 3.5%NaCl solution: (a) x = 0, (b) x = 0.2, (c) x = 0.5, (d) x = 0.8, (e) x = 1.0, (f) x = 1.2 ^[42]

Fig.3 Nyquist (a), Bode (b) plots of as-cast Al_{2 -}_x CoCr-FeNiTi _x HEAs and corresponding equivalent circuit model (c)^[42]

Table 1 E_corr, I_corr, I_pass, and E_pit values of three alloys in 0.5 mol/L H₂SO₄ solution^[48]

Fig.4 Potentiodynamic polarization curves of Co _x CrCuFeMnNi HEAs in 3.5%NaCl solution^[53]

Table 2 Corrosion performance parameters of Co _x CrCuFeMnNi HEAs in 3.5%NaCl solution^[53]

Fig.5 SEM and 3D images of anodic dissolution morphologies of FeCoCrNiMo _x alloys polarized in 1 mol/L NaCl for 600 s and 1800 s, (a1-c1) x = 0, (a2-c2) x = 0.1, (a3-c3) x = 0.3, (a4-c4) x = 0.6^[57]

Table 3 Electrochemical parameters of FCC HEAs in 3.5%NaCl solution

Fig.6 BSE (a, c, e) and EBSD (b, d, f) images of Al _x CoCrFeNi alloys: (a, b) x = 0.3, (c, d) x = 0.5, (e, f) x = 0.7^[65,66]

Fig.7 Corrosion morphologies of Al _x CoCrFeNiCu HEAs after immersion in 10%HNO₃ solution for 24 h: (a) x = 0.5, (b) x = 1.0, (c) x = 1.5, (d) x = 2.0^[70]

Table 4 Electrochemical parameters of (FCC + BCC) HEAs in 3.5%NaCl solution

Table 5 Electrochemical parameters of (FCC + BCC) HEAs in acidic solutions

Table 6 Corrosion rates of CrFeCoNiTi _x (x = 0.5, 1.0) in seawater^[90]

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