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Article

Corrosion Resistance of CoCrFeNiMn High Entropy Alloy Coating Prepared through Plasma Transfer Arc Claddings

1
School of Materials and Chemical Engineering, Xi’an Technological University, Xi’an 710021, China
2
Shaanxi Province Engineering Research Centre of Aluminum/Magnesium Light Alloy and Composites, Xi’an 710021, China
3
Shanxi Disel Engine Co., Ltd., Datong 035600, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Mirosław Szala
Metals 2021, 11(11), 1876; https://doi.org/10.3390/met11111876
Received: 31 October 2021 / Revised: 19 November 2021 / Accepted: 20 November 2021 / Published: 22 November 2021
High entropy alloy attracts great attention for its high thermal stability and corrosion resistance. A CoCrFeNiMn high-entropy alloy coating was deposited on grey cast iron through plasma transfer arc cladding. It formed fine acicular martensite near the grey cast iron, with columnar grains perpendicular to the interface between the grey cast iron substrate and the cladding layer as well as dendrite in the middle part of the coatings. Simple FCC solid solutions present in the coatings which were similar to the powder’s structure. The coating had a microhardness of 300 ± 21.5 HV0.2 when the cladding current was 80 A for the solid solution strengthening. The HEA coating had the highest corrosion potential of −0.253 V when the plasma current was 60 A, which was much higher than the grey cast iron’s corrosion potential of −0.708 V. Meanwhile, the coating had a much lower corrosion current density of 9.075 × 10−7 mA/cm2 than the grey cast iron’s 2.4825 × 10−6 mA/cm2, which reflected that the CoCrFeNiMn HEA coating had much better corrosion resistance and lower corrosion rate than the grey cast iron for single FCC solid solution phase and a relatively higher concentration of Cr in the grain boundaries than in the grains and this could lead to corrosion protection effects. View Full-Text
Keywords: high-entropy alloy coating; plasma cladding; microstructure; corrosion high-entropy alloy coating; plasma cladding; microstructure; corrosion
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MDPI and ACS Style

Gao, P.-H.; Fu, R.-T.; Chen, B.-Y.; Zeng, S.-C.; Zhang, B.; Yang, Z.; Guo, Y.-C.; Liang, M.-X.; Li, J.-P.; Lu, Y.-Q.; Jia, L.; Zhao, D. Corrosion Resistance of CoCrFeNiMn High Entropy Alloy Coating Prepared through Plasma Transfer Arc Claddings. Metals 2021, 11, 1876. https://doi.org/10.3390/met11111876

AMA Style

Gao P-H, Fu R-T, Chen B-Y, Zeng S-C, Zhang B, Yang Z, Guo Y-C, Liang M-X, Li J-P, Lu Y-Q, Jia L, Zhao D. Corrosion Resistance of CoCrFeNiMn High Entropy Alloy Coating Prepared through Plasma Transfer Arc Claddings. Metals. 2021; 11(11):1876. https://doi.org/10.3390/met11111876

Chicago/Turabian Style

Gao, Pei-Hu, Rui-Tao Fu, Bai-Yang Chen, Sheng-Cong Zeng, Bo Zhang, Zhong Yang, Yong-Chun Guo, Min-Xian Liang, Jian-Ping Li, Yong-Qing Lu, Lu Jia, and Dan Zhao. 2021. "Corrosion Resistance of CoCrFeNiMn High Entropy Alloy Coating Prepared through Plasma Transfer Arc Claddings" Metals 11, no. 11: 1876. https://doi.org/10.3390/met11111876

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