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<p>Micro-arc oxidation (MAO) film are widely used for surface modification of lightweight metals. With increasingly demanding service conditions, it is highly significant to design a simple process that can enhance the performance of these films. In this study, optimal parameters for the preparation of micro-arc oxidation coatings were obtained through orthogonal experiments, and, based on these results, an innovative heat treatment process for the film was investigated. The findings show that, under the experimental conditions, the optimal process parameters are a voltage of 420 V, a duty cycle of 20%, an oxidation time of 18 min, and a sodium tetraborate content of 5 g/L. Heat treatment can improve the phase composition of the film, forming a thermodynamically stable rutile phase. As the heat treatment temperature increases, the porosity and pore size of the coating decrease, while the thickness increases. When the heat treatment temperature exceeds 500&#xa0;°C, cracks form on the film surface, and the film fails at 950&#xa0;°C. The best wear resistance of the coating is achieved at a heat treatment temperature of 650&#xa0;°C, with a hardness of 693.6&#xa0;HV and a wear rate of 23.4 × 10 <sup>−6</sup>. The best corrosion resistance is observed at a heat treatment temperature of 500&#xa0;°C, with a corrosion potential of 158&#xa0;mV/cm<sup>2</sup> and a corrosion current of 110 nA/cm<sup>2</sup>.</p> Graphical Abstract <p></p>

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Research on the Preparation and Heat Treatment Process of Micro-arc Oxidized Coating Layer of Aviation Titanium Alloy TC11

  • 期刊论文

  • 发表日期：

    2025年9月23日

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  • Changxin Lai,
  • Yihua Dai,
  • Jianyi Shen,
  • Liwei Shan,
  • Shuaishuai Shan,
  • Shuyan Wang

摘要

Micro-arc oxidation (MAO) film are widely used for surface modification of lightweight metals. With increasingly demanding service conditions, it is highly significant to design a simple process that can enhance the performance of these films. In this study, optimal parameters for the preparation of micro-arc oxidation coatings were obtained through orthogonal experiments, and, based on these results, an innovative heat treatment process for the film was investigated. The findings show that, under the experimental conditions, the optimal process parameters are a voltage of 420 V, a duty cycle of 20%, an oxidation time of 18 min, and a sodium tetraborate content of 5 g/L. Heat treatment can improve the phase composition of the film, forming a thermodynamically stable rutile phase. As the heat treatment temperature increases, the porosity and pore size of the coating decrease, while the thickness increases. When the heat treatment temperature exceeds 500 °C, cracks form on the film surface, and the film fails at 950 °C. The best wear resistance of the coating is achieved at a heat treatment temperature of 650 °C, with a hardness of 693.6 HV and a wear rate of 23.4 × 10 −6. The best corrosion resistance is observed at a heat treatment temperature of 500 °C, with a corrosion potential of 158 mV/cm2 and a corrosion current of 110 nA/cm2.

Graphical Abstract