Microstructure and corrosion properties of CoCrCuFeMnNix high‐entropy alloys prepared by powder metallurgy

CoCrCuFeMnNix (x = 0.5, 1.0, 1.5, 2.0 mol, named Ni0.5, Ni1.0, Ni1.5, and Ni2.0, respectively) high‐entropy alloys (HEAs) were prepared by powder metallurgy. The effects of Ni content on its microstructure and corrosion resistance in a 3.5% NaCl solution were studied. The HEAs with low Ni content co...

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Bibliographic Details
Published in:Materials and corrosion 2023-07, Vol.74 (7), p.1076-1085
Main Authors: Zhao, Rui‐Feng, Jiang, Ai‐Yun, Ren, Bo, Chen, Chong, Liu, Jian‐Xiu
Format: Article
Language:English
Subjects:
Alloy powders
Alloys
Corrosion currents
Corrosion effects
Corrosion potential
Corrosion rate
Corrosion resistance
Electrochemical impedance spectroscopy
High entropy alloys
high‐entropy alloy
Microstructure
Nickel
Polarization
polarization corrosion
Powder metallurgy
Sigma phase
Sodium chloride
Thickness
vacuum hot pressing sintering
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Summary:CoCrCuFeMnNix (x = 0.5, 1.0, 1.5, 2.0 mol, named Ni0.5, Ni1.0, Ni1.5, and Ni2.0, respectively) high‐entropy alloys (HEAs) were prepared by powder metallurgy. The effects of Ni content on its microstructure and corrosion resistance in a 3.5% NaCl solution were studied. The HEAs with low Ni content consisted of FCC1 primary phase, FCC2 secondary phase, and a few σ phases. While the Ni2.0 alloy was composed of the FCC phase and a small amount of σ phase. The results of polarization corrosion in 3.5% NaCl solution show that the increase of Ni content led to the increase of corrosion potential of the alloy and the decrease of corrosion current density and average corrosion rate. Among them, Ni2.0 alloy had the best corrosion resistance. The electrochemical impedance spectroscopy analysis showed that the increase in Ni content promoted the increase of the polarization resistance of the alloy RCPE and the thickness of the passive film, thus improving the corrosion resistance of the alloys. CoCrCuFeMnNix (x = 0.5, 1.0, 1.5, 2.0 mol, named Ni0.5, Ni1.0, Ni1.5, and Ni2.0, respectively) high‐entropy alloys were prepared by powder metallurgy. The effects of Ni content on its microstructure and corrosion resistance in a 3.5% NaCl solution were studied. The increase in Ni content promoted the increase of the polarization resistance of the alloy and the thickness of the passive film, thus improving the corrosion resistance of the alloys.
ISSN:0947-5117
1521-4176
DOI:10.1002/maco.202213620