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<p>Plasma electrolytic oxidation (PEO) is an effective surface treatment technique for improving the corrosion resistance of magnesium alloy surfaces. However, optimizing electrical parameters to achieve synergistic improvements in coating microstructure and properties remains a key challenge. Based on orthogonal experiments, the effects of duty cycle, frequency, voltage, and their interactions on the surface morphology and corrosion resistance of magnesium-lithium alloy coatings prepared by PEO were investigated. The corrosion resistance of the coatings was assessed by electrochemical tests in NaCl. The results show that T4 has the lowest corrosion current (1.15&#xa0;μA/cm<sup>2</sup>) with a reduction of approximately 53% (2.44&#xa0;μA/cm<sup>2</sup>) to 93% (16&#xa0;μA/cm<sup>2</sup>) compared to the other coatings, with voltage having the greatest effect, followed by duty cycle and frequency. The combination of parameters with low duty cycle, medium voltage and high frequency significantly reduces crack generation in the coating. In addition, the electrical parameters also had a significant effect on the thickness, crack density and surface roughness of the coatings, where the duty cycle was positively correlated with the coating thickness, while the small duty cycle and frequency combined with medium voltage helped to minimize the surface roughness and crack density of the coatings. This study provides theoretical guidance for the preparation of highly corrosion-resistant coatings, which further expands the potential of magnesium-lithium alloys for engineering applications.</p>

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Effect of electrical parameters on the microstructure and corrosion resistance of plasma electrolytic oxidation coatings of LA103Z alloy based on orthogonal experiment method

  • 期刊论文

  • 发表日期：

    2025年7月11日

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  • Hongzhan Li,
  • Yifei Wang,
  • Weiyi Mu,
  • Shaolong Li

摘要

Plasma electrolytic oxidation (PEO) is an effective surface treatment technique for improving the corrosion resistance of magnesium alloy surfaces. However, optimizing electrical parameters to achieve synergistic improvements in coating microstructure and properties remains a key challenge. Based on orthogonal experiments, the effects of duty cycle, frequency, voltage, and their interactions on the surface morphology and corrosion resistance of magnesium-lithium alloy coatings prepared by PEO were investigated. The corrosion resistance of the coatings was assessed by electrochemical tests in NaCl. The results show that T4 has the lowest corrosion current (1.15 μA/cm2) with a reduction of approximately 53% (2.44 μA/cm2) to 93% (16 μA/cm2) compared to the other coatings, with voltage having the greatest effect, followed by duty cycle and frequency. The combination of parameters with low duty cycle, medium voltage and high frequency significantly reduces crack generation in the coating. In addition, the electrical parameters also had a significant effect on the thickness, crack density and surface roughness of the coatings, where the duty cycle was positively correlated with the coating thickness, while the small duty cycle and frequency combined with medium voltage helped to minimize the surface roughness and crack density of the coatings. This study provides theoretical guidance for the preparation of highly corrosion-resistant coatings, which further expands the potential of magnesium-lithium alloys for engineering applications.