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<p>The corrosion behaviors of an as-cast FeCoNiAl<sub>0.75</sub>Cr<sub>1.25</sub> high-entropy alloy (HEA) in acidic Na<sub>2</sub>SO<sub>4</sub> solution with different pH values were investigated. The results indicate that the as-cast FeCoNiAl<sub>0.75</sub>Cr<sub>1.25</sub> HEA is mainly composed of face-centered cubic phase, body-centered cubic (BCC1) phase (Co–Cr–Fe) and ordered BCC (B2) phase (Ni–Al), in which BCC1 phase and B2 phase have a eutectic microstructure. Moreover, the corrosion of B2 phase occurs preferentially in a 0.05&#xa0;mol/L SO<sub>4</sub><sup>2−</sup> acidic solution. The electrochemical measurement results show that the corrosion resistance of the investigated HEA significantly changes as the solution pH increases from 2 to 2.5. This indicates that there is a critical pH in the range of 2–2.5 that affects the corrosion of HEA. In addition, the results of X-ray photoelectron spectroscopy prove that the surface film of FeCoNiAl<sub>0.75</sub>Cr<sub>1.25</sub> in SO<sub>4</sub><sup>2−</sup> solution is formed with Al<sub>2</sub>O<sub>3</sub> and Cr<sub>2</sub>O<sub>3</sub> as the main components, and The content of Al<sub>2</sub>O<sub>3</sub> and Cr<sub>2</sub>O<sub>3</sub> increases with increasing solution pH.</p>

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Electrochemical behavior of FeCoNiAl0.75Cr1.25 high-entropy alloy in Na2SO4 solution with acidic pH

  • 期刊论文

  • 发表日期：

    2025年1月9日

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  • Ye-sen Zhu,
  • Shi-jie Yu,
  • Si Chen,
  • Bao-wen Hu,
  • Chuan-min Wang,
  • Yun-ze Xu,
  • Yi Huang,
  • Ming-yu Wang

摘要

The corrosion behaviors of an as-cast FeCoNiAl0.75Cr1.25 high-entropy alloy (HEA) in acidic Na2SO4 solution with different pH values were investigated. The results indicate that the as-cast FeCoNiAl0.75Cr1.25 HEA is mainly composed of face-centered cubic phase, body-centered cubic (BCC1) phase (Co–Cr–Fe) and ordered BCC (B2) phase (Ni–Al), in which BCC1 phase and B2 phase have a eutectic microstructure. Moreover, the corrosion of B2 phase occurs preferentially in a 0.05 mol/L SO42− acidic solution. The electrochemical measurement results show that the corrosion resistance of the investigated HEA significantly changes as the solution pH increases from 2 to 2.5. This indicates that there is a critical pH in the range of 2–2.5 that affects the corrosion of HEA. In addition, the results of X-ray photoelectron spectroscopy prove that the surface film of FeCoNiAl0.75Cr1.25 in SO42− solution is formed with Al2O3 and Cr2O3 as the main components, and The content of Al2O3 and Cr2O3 increases with increasing solution pH.