Electrochemical Surface Modification of Al<sub>8</sub>Co<sub>19</sub>Cr<sub>23</sub>Fe<sub>32</sub>Ni<sub>18</sub> in H<sub>2</sub>SO<sub>4</sub>: A High-Entropy Alloy with High Pitting Corrosion Resistance and High Oxidation Resistance

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  • Pao Li
    Department of Materials Science, Graduate School of Engineering, Tohoku University
  • Nishimoto Masashi
    Department of Materials Science, Graduate School of Engineering, Tohoku University
  • Muto Izumi
    Department of Materials Science, Graduate School of Engineering, Tohoku University
  • Sugawara Yu
    Department of Materials Science, Graduate School of Engineering, Tohoku University

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Other Title
  • Electrochemical Surface Modification of Al₈Co₁₉Cr₂₃Fe₃₂Ni₁₈ in H₂SO₄ : A High-Entropy Alloy with High Pitting Corrosion Resistance and High Oxidation Resistance

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Abstract

<p>An Al8Co19Cr23Fe32Ni18 high-entropy alloy with a solid solution of Al was prepared, and its pitting corrosion resistance in 0.1 M NaCl and high-temperature oxidation resistance at 1273 K were assessed. The pitting potential of this alloy is lower than that of the Al-free Co19Cr23Fe40Ni18 alloy, although its oxidation resistance is higher. The decrease in the pitting potential owing to Al addition was attributed to Al in the surface oxide film and Al nitride inclusions in the metal matrix. For the Al8Co19Cr23Fe32Ni18 alloy, potentiodynamic polarization in 1 M H2SO4 improved the pitting corrosion resistance without decreasing the high-temperature oxidation resistance.</p>

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 64 (9), 2286-2295, 2023-09-01

    The Japan Institute of Metals and Materials

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