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Volume 15
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10.3390/ma15196976
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Article

Dynamic Polarization Behaviors of Equimolar CoCrFeNi High-Entropy Alloy Compared with 304 Stainless Steel in 0.5 M H2SO4 Aerated Aqueous Solution

by
Chao-Chun Yen
1,
Ting-Lun Tsai
1,
Bo-Wei Wu
1,
Yu-Chieh Lo
2,
Ming-Hung Tsai
1 and
Shiow-Kang Yen
1,*
1
Department of Materials Science and Engineering, National Chung Hsing University, Taichung 40227, Taiwan
2
Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
*
Author to whom correspondence should be addressed.
Materials 2022, 15(19), 6976; https://doi.org/10.3390/ma15196976
Submission received: 2 September 2022 / Revised: 29 September 2022 / Accepted: 4 October 2022 / Published: 8 October 2022
(This article belongs to the Special Issue Future Trends in High-Entropy Alloys)
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Abstract

Three corrosion potentials and three corrosion current densities are clearly identified before the passivation for both dynamic polarization curves of equimolar CoCrFeNi high-entropy alloy (HEA) and 304 stainless steel (304SS) in 0.5 M H2SO4 aerated aqueous solution, by decomposing anodic and cathodic polarization curves. The passivated current density of the former is greater than the latter, compliant with not only the constant of solubility product (ksp) and redox equilibrium potential (Eeq) of each metal hydroxide but also the sequence of bond energy (Eb) for monolayer hydroxide on their facets derived from the first principle founded on density function theory. However, the total amount of ion releasing from HEA is less than 304SS, since the hydroxide/oxide film formed in the air of the latter containing greater amounts of Fe(Ⅱ) and Mn(Ⅱ) is less stable around corrosion potentials while they are further oxidized into more stable Fe(Ⅲ) and Mn(ⅢorⅣ) with much lower ksp, leading to the much less increasing ratios of ion releases from 0.25 to 0.6 V.
Keywords: high-entropy alloy; first-principles calculations; polarization; ICP-MS; passive film high-entropy alloy; first-principles calculations; polarization; ICP-MS; passive film

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MDPI and ACS Style

Yen, C.-C.; Tsai, T.-L.; Wu, B.-W.; Lo, Y.-C.; Tsai, M.-H.; Yen, S.-K. Dynamic Polarization Behaviors of Equimolar CoCrFeNi High-Entropy Alloy Compared with 304 Stainless Steel in 0.5 M H2SO4 Aerated Aqueous Solution. Materials 2022, 15, 6976. https://doi.org/10.3390/ma15196976

AMA Style

Yen C-C, Tsai T-L, Wu B-W, Lo Y-C, Tsai M-H, Yen S-K. Dynamic Polarization Behaviors of Equimolar CoCrFeNi High-Entropy Alloy Compared with 304 Stainless Steel in 0.5 M H2SO4 Aerated Aqueous Solution. Materials. 2022; 15(19):6976. https://doi.org/10.3390/ma15196976

Chicago/Turabian Style

Yen, Chao-Chun, Ting-Lun Tsai, Bo-Wei Wu, Yu-Chieh Lo, Ming-Hung Tsai, and Shiow-Kang Yen. 2022. "Dynamic Polarization Behaviors of Equimolar CoCrFeNi High-Entropy Alloy Compared with 304 Stainless Steel in 0.5 M H2SO4 Aerated Aqueous Solution" Materials 15, no. 19: 6976. https://doi.org/10.3390/ma15196976

APA Style

Yen, C.-C., Tsai, T.-L., Wu, B.-W., Lo, Y.-C., Tsai, M.-H., & Yen, S.-K. (2022). Dynamic Polarization Behaviors of Equimolar CoCrFeNi High-Entropy Alloy Compared with 304 Stainless Steel in 0.5 M H2SO4 Aerated Aqueous Solution. Materials, 15(19), 6976. https://doi.org/10.3390/ma15196976

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