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<p>The corrosion behavior difference between CoCrFeMnNi high-entropy alloy (HEA) and 316L stainless steel (SS) in a strongly alkaline environment of 0.5&#xa0;mol/L NaOH solution was systematically studied. Comparative analysis reveals that the HEA exhibits excellent corrosion resistance manifested by lower passive current density of 6.76&#xa0;μA·cm<sup>−2</sup>, slower corrosion rate of 0.062&#xa0;mm·a<sup>−1</sup> and slighter pitting degree, as well as nobler corrosion potential compared with 316L SS. The difference in anti-corrosion property between two alloys is attributed to three principal factors: distinct elemental composition, microstructural difference of grain size and twins, and protective efficacy of passive film. A thicker passivation film (3.752&#xa0;nm) with lower defect concentration is grown on the HEA, which provides the better barrier property against detrimental ions penetration. The HEA passive film contains more protective components of Cr and Ni compounds, and less unstable Fe oxide and hydroxide.</p>

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Comparing the Anti-corrosion Property of CoCrFeMnNi High Entropy Alloy and Austenitic Stainless Steel in NaOH Solution

  • 期刊论文

  • 发表日期：

    2026年1月27日

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  • J. L. Dai,
  • J. T. Zhang,
  • M. Zhu,
  • Y. F. Yuan,
  • S. M. Yin

摘要

The corrosion behavior difference between CoCrFeMnNi high-entropy alloy (HEA) and 316L stainless steel (SS) in a strongly alkaline environment of 0.5 mol/L NaOH solution was systematically studied. Comparative analysis reveals that the HEA exhibits excellent corrosion resistance manifested by lower passive current density of 6.76 μA·cm−2, slower corrosion rate of 0.062 mm·a−1 and slighter pitting degree, as well as nobler corrosion potential compared with 316L SS. The difference in anti-corrosion property between two alloys is attributed to three principal factors: distinct elemental composition, microstructural difference of grain size and twins, and protective efficacy of passive film. A thicker passivation film (3.752 nm) with lower defect concentration is grown on the HEA, which provides the better barrier property against detrimental ions penetration. The HEA passive film contains more protective components of Cr and Ni compounds, and less unstable Fe oxide and hydroxide.