Effect of carbon addition on the microstructure and corrosion resistance of the CoCrFeNi high-entropy alloy

Interstitial atom doping can enhance mechanical properties and phase structure, but its impact on corrosion resistance is not well-researched. This study investigated the influence of carbon-doping on the microstructure and corrosion resistance of CoCrFeNi high-entropy alloys. The results show that...

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Bibliographic Details
Published in:Corrosion science 2024-05, Vol.231, p.111965, Article 111965
Main Authors: Wei, Xueming, Zhang, Lijun, Zhang, Fengyi, Zhang, Chunzhi, Jia, Qixiang, Sun, Kai, Duan, Dongtao, Jiang, Hui, Li, Gong
Format: Article
Language:English
Subjects:
Carbon atom
High-entropy alloy
Microstructure
Passive film
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Summary:Interstitial atom doping can enhance mechanical properties and phase structure, but its impact on corrosion resistance is not well-researched. This study investigated the influence of carbon-doping on the microstructure and corrosion resistance of CoCrFeNi high-entropy alloys. The results show that alloy doped with a moderate carbon content (C0.3 alloy) have the best corrosion resistance in 3.5 wt% NaCl solution, while alloys with carbides (M7C3) show poor corrosion resistance. The stability, semiconductive property, and composition of the passivation films were characterized to reveal the corrosion mechanisms. These findings provide a theoretical basis for the development and application of carbon-doped high-entropy alloys. •The corrosion mechanisms of CoCrFeNi-Cx HEAs was studied.•Doping with moderate amounts of carbon can improve the corrosion resistance.•The alloys containing M7C3 carbides undergo galvanic coupling corrosion.•The passivation film properties of alloys (C0.1, C0.3, C0.9) were investigated.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2024.111965