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<p>Due to its excellent conductivity and corrosion resistance, NiCu alloy has been extensively studied and utilized by researchers. However, existing research primarily focuses on the corrosion rate, current efficiency, and aluminum product purity of inert anodes, with limited detailed analysis of the corrosion mechanism. This study investigates the corrosion behavior of NiCu alloy in a Na<sub>3</sub>AlF<sub>6</sub>-AlF<sub>3</sub>-Al<sub>2</sub>O<sub>3</sub> system using cyclic voltammetry, potentiodynamic polarization, X-ray diffraction, and scanning electron microscopy. Pure Ni, pure Cu, and an equiatomic NiCu alloy were selected as samples, and the corrosion resistance of the NiCu alloy was evaluated through electrolytic experiments. The results reveal that the corrosion resistance of NiCu alloy surpasses that of both Ni and Cu. A mixed oxide layer consisting of Cu<sub>2</sub>O, NiO, and NiAl<sub>2</sub>O<sub>4</sub> was formed on the surface of the NiCu alloy, effectively protecting the anode substrate while maintaining the stability of the electrolytic voltage. After electrolysis at a current density of 1&#xa0;A/cm<sup>2</sup> for one hour, the thickness of the corrosion layer was measured to be 21.3&#xa0;μm. Additionally, the presence of aluminum oxide was found to enhance the protection of the inert anode during electrolysis.</p>

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Electrochemical behavior of NiCu anode in cryolite and the synergistic effect of Al2O3 on corrosion resistance

  • 期刊论文

  • 发表日期：

    2025年12月6日

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  • Yun-ze Qiao,
  • Yu Hua,
  • Guang-xin Wu,
  • Chen-yang Shi,
  • Ying-de Huang,
  • Wen-jie Yang

摘要

Due to its excellent conductivity and corrosion resistance, NiCu alloy has been extensively studied and utilized by researchers. However, existing research primarily focuses on the corrosion rate, current efficiency, and aluminum product purity of inert anodes, with limited detailed analysis of the corrosion mechanism. This study investigates the corrosion behavior of NiCu alloy in a Na3AlF6-AlF3-Al2O3 system using cyclic voltammetry, potentiodynamic polarization, X-ray diffraction, and scanning electron microscopy. Pure Ni, pure Cu, and an equiatomic NiCu alloy were selected as samples, and the corrosion resistance of the NiCu alloy was evaluated through electrolytic experiments. The results reveal that the corrosion resistance of NiCu alloy surpasses that of both Ni and Cu. A mixed oxide layer consisting of Cu2O, NiO, and NiAl2O4 was formed on the surface of the NiCu alloy, effectively protecting the anode substrate while maintaining the stability of the electrolytic voltage. After electrolysis at a current density of 1 A/cm2 for one hour, the thickness of the corrosion layer was measured to be 21.3 μm. Additionally, the presence of aluminum oxide was found to enhance the protection of the inert anode during electrolysis.