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<p>Due to aluminum’s high affinity for oxygen in air, the thin oxide film naturally formed on the aluminum surface cannot withstand harsh environmental conditions, leading to poor corrosion resistance. Therefore, to improve the surface mechanical properties and corrosion resistance of the new Al-Cu-Mg-Ag heat-resistant aluminum alloy, this study has designed a composite surface treatment process combining anodizing and magnetron sputtering coating. The effects of this surface treatment process on the alloy’s hardness and corrosion resistance were studied through hardness tests, salt spray corrosion tests, and electrochemical tests. The mechanism of the composite surface treatment technology was studied using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD). The experimental results indicate that both magnetron sputtering coating alone and the composite treatment of anodizing combined with magnetron sputtering coating significantly improve the alloy’s surface hardness and corrosion resistance, with the composite treatment showing the best results. Furthermore, by filling the porous oxide film formed during anodizing with the subsequent magnetron-sputtered nanoscale film, a dense hard layer is formed, effectively improving the substrate’s hardness and corrosion resistance. As the anodizing time increases, the porosity of the oxide film decreases, leading to improvements in both hardness and corrosion resistance. The study found that the alloy’s corrosion resistance in a salt spray environment is optimal when the anodizing time is 10 min and the magnetron-sputtered TiCN film is deposited.</p>

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Effect of Surface Treatment of Al-Cu-Mg-Ag Alloy on Its Mechanical Properties and Corrosion Resistance

  • 期刊论文

  • 发表日期：

    2025年3月7日

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  • Chenyu Li,
  • Fei Gao,
  • Chuanzhi Liu,
  • Xiaoyan Liu,
  • Jiayu Liu,
  • Shufeng Zhao,
  • Yanqin Wang,
  • Xiliang Zhang

摘要

Due to aluminum’s high affinity for oxygen in air, the thin oxide film naturally formed on the aluminum surface cannot withstand harsh environmental conditions, leading to poor corrosion resistance. Therefore, to improve the surface mechanical properties and corrosion resistance of the new Al-Cu-Mg-Ag heat-resistant aluminum alloy, this study has designed a composite surface treatment process combining anodizing and magnetron sputtering coating. The effects of this surface treatment process on the alloy’s hardness and corrosion resistance were studied through hardness tests, salt spray corrosion tests, and electrochemical tests. The mechanism of the composite surface treatment technology was studied using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD). The experimental results indicate that both magnetron sputtering coating alone and the composite treatment of anodizing combined with magnetron sputtering coating significantly improve the alloy’s surface hardness and corrosion resistance, with the composite treatment showing the best results. Furthermore, by filling the porous oxide film formed during anodizing with the subsequent magnetron-sputtered nanoscale film, a dense hard layer is formed, effectively improving the substrate’s hardness and corrosion resistance. As the anodizing time increases, the porosity of the oxide film decreases, leading to improvements in both hardness and corrosion resistance. The study found that the alloy’s corrosion resistance in a salt spray environment is optimal when the anodizing time is 10 min and the magnetron-sputtered TiCN film is deposited.