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<p>The corrosion behavior of CoCrCu<sub>0.1</sub>FeMoNi high entropy alloy (HEA) in 0.5&#xa0;mol/L NaOH solution was investigated using X-ray photoelectron spectroscopy, X-ray diffraction, scanning electron microscopy, potentiodynamic polarization measurement, and electrochemical impedance spectroscopy. The results showed that the microstructure of this HEA displayed a dendritic morphology along with inter-dendritic regions. At the applied potential of –0.3, 0, and 0.1 V <i>vs</i>. saturated calomel electrode (SCE), no significant damage to the surface of the alloy was observed. At the applied potentials of 0.15 and 0.2&#xa0;V <i>vs</i>. SCE, selective detachment and tearing of the microstructure on the alloy surface were observed, attributed to micro-galvanic corrosion. HEA demonstrates typical spontaneous passivation behavior and exhibits capacitance at all five applied potentials. The energy dispersive spectroscopy results indicate significant elemental segregation within HEA, with a decrease in the content of Cr<sub>2</sub>O<sub>3</sub> in the passive film as the applied potential increases. Consequently, the protective efficacy of the passive film over the substrate in 0.5&#xa0;mol/L NaOH solution was compromised.</p>

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Corrosion behavior of CoCrCu0.1FeMoNi high entropy alloy in 0.5 mol/L NaOH solution

  • 期刊论文

  • 发表日期：

    2025年1月21日

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  • Hao-jie Zhu,
  • Jian-yang Han,
  • Ke-wei Fang,
  • Zhi-bin Zheng,
  • Hui-ling Zhou,
  • Lan-lan Yang,
  • Yan-xin Qiao,
  • Jian Chen,
  • Jie Cui,
  • Qiang Wang

摘要

The corrosion behavior of CoCrCu0.1FeMoNi high entropy alloy (HEA) in 0.5 mol/L NaOH solution was investigated using X-ray photoelectron spectroscopy, X-ray diffraction, scanning electron microscopy, potentiodynamic polarization measurement, and electrochemical impedance spectroscopy. The results showed that the microstructure of this HEA displayed a dendritic morphology along with inter-dendritic regions. At the applied potential of –0.3, 0, and 0.1 V vs. saturated calomel electrode (SCE), no significant damage to the surface of the alloy was observed. At the applied potentials of 0.15 and 0.2 V vs. SCE, selective detachment and tearing of the microstructure on the alloy surface were observed, attributed to micro-galvanic corrosion. HEA demonstrates typical spontaneous passivation behavior and exhibits capacitance at all five applied potentials. The energy dispersive spectroscopy results indicate significant elemental segregation within HEA, with a decrease in the content of Cr2O3 in the passive film as the applied potential increases. Consequently, the protective efficacy of the passive film over the substrate in 0.5 mol/L NaOH solution was compromised.