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<p>Corrosion in marine environments is the main cause of aging and failure of marine equipment. Plasma spraying technology can address this, with nano-ceramic coatings significantly enhancing material corrosion resistance. In this paper, 7075 aluminum alloy was used as the substrate to prepare four types of ceramic coatings: n-AT13 (nano-structured Al<sub>2</sub>O<sub>3</sub>-13&#xa0;wt.% TiO<sub>2</sub>) coating, c-AT13 (micron-structured Al<sub>2</sub>O<sub>3</sub>-13&#xa0;wt.% TiO<sub>2</sub>) coating, n-8YSZ (nano-structured 8-mol.% yttria-stabilized zirconia) coating, and c-8YSZ (micron-structured 8 mol.% yttria-stabilized zirconia) coating. Experimental analysis shows that compared with micro-coatings, the average hardness of AT13 and 8YSZ nano-coatings is increased by 16.4% and 10.6%; the surface porosity is reduced by 8.4% and 9.5%, and the self-corrosion potential is raised by 28.6% and 30.0%, respectively. Among them, the n-AT13 coating performed best. Simulation results indicated that when the porosity is constant, appropriately increasing the number of pores can improve corrosion resistance, which is consistent with the pore distribution of nano-coatings and the results of electrochemical corrosion in the experimental analysis. During corrosion, the current density of the electrolyte first increases and then decreases, reflecting the corrosion-inhibiting effect of corrosion products. This research provides an effective technical reference for nano-ceramic coatings in the anti-corrosion protection of 7075 aluminum alloy in marine environments and promotes the engineering application of nano-ceramic coatings in marine equipment.</p>

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Study on the Microstructure and Corrosion Resistance of Plasma-Sprayed Nano-ceramic Coatings on 7075 Aluminum Alloy

  • 期刊论文

  • 发表日期：

    2026年4月13日

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  • Yongpeng Fan,
  • Jiajing Pan,
  • Kun Lu,
  • Jiyuan Wang,
  • Zhou An,
  • Zhenhao Han,
  • Qingyun Cao,
  • Haoyan Yang

摘要

Corrosion in marine environments is the main cause of aging and failure of marine equipment. Plasma spraying technology can address this, with nano-ceramic coatings significantly enhancing material corrosion resistance. In this paper, 7075 aluminum alloy was used as the substrate to prepare four types of ceramic coatings: n-AT13 (nano-structured Al2O3-13 wt.% TiO2) coating, c-AT13 (micron-structured Al2O3-13 wt.% TiO2) coating, n-8YSZ (nano-structured 8-mol.% yttria-stabilized zirconia) coating, and c-8YSZ (micron-structured 8 mol.% yttria-stabilized zirconia) coating. Experimental analysis shows that compared with micro-coatings, the average hardness of AT13 and 8YSZ nano-coatings is increased by 16.4% and 10.6%; the surface porosity is reduced by 8.4% and 9.5%, and the self-corrosion potential is raised by 28.6% and 30.0%, respectively. Among them, the n-AT13 coating performed best. Simulation results indicated that when the porosity is constant, appropriately increasing the number of pores can improve corrosion resistance, which is consistent with the pore distribution of nano-coatings and the results of electrochemical corrosion in the experimental analysis. During corrosion, the current density of the electrolyte first increases and then decreases, reflecting the corrosion-inhibiting effect of corrosion products. This research provides an effective technical reference for nano-ceramic coatings in the anti-corrosion protection of 7075 aluminum alloy in marine environments and promotes the engineering application of nano-ceramic coatings in marine equipment.