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Dynamic Polarization Behaviors of Equimolar CoCrFeNi High-Entropy Alloy Compared with 304 Stainless Steel in 0.5 M H2SO4 Aerated Aqueous Solution.
Yen, Chao-Chun; Tsai, Ting-Lun; Wu, Bo-Wei; Lo, Yu-Chieh; Tsai, Ming-Hung; Yen, Shiow-Kang.
Afiliação
  • Yen CC; Department of Materials Science and Engineering, National Chung Hsing University, Taichung 40227, Taiwan.
  • Tsai TL; Department of Materials Science and Engineering, National Chung Hsing University, Taichung 40227, Taiwan.
  • Wu BW; Department of Materials Science and Engineering, National Chung Hsing University, Taichung 40227, Taiwan.
  • Lo YC; Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan.
  • Tsai MH; Department of Materials Science and Engineering, National Chung Hsing University, Taichung 40227, Taiwan.
  • Yen SK; Department of Materials Science and Engineering, National Chung Hsing University, Taichung 40227, Taiwan.
Materials (Basel) ; 15(19)2022 Oct 08.
Article em En | MEDLINE | ID: mdl-36234317
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.
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2022 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2022 Tipo de documento: Article