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<p>The wear resistance of TC4 alloy is relatively poor, and fretting wear of TC4 alloy is inevitable in engineering applications. The PEO technology offers a potential solution for improving the fretting wear performance of TC4 alloy. By adjusting the electrolytic voltage, the PEO coating performance can be specifically improved. However, the fretting wear characteristics of PEO coatings on TC4 alloy under different electrolytic voltages remained unclear. Therefore, this paper thoroughly investigated the effect of electrolytic voltages on the fretting wear characteristics of PEO coatings on TC4 alloy. The results indicated that appropriately increasing the electrolytic voltage was beneficial for enhancing the hardness and density of the coatings, thereby reducing the friction coefficient and frictional dissipation energy, and improving the fretting wear resistance of PEO coatings. However, excessively high processing voltage increased porosity and introduced defects such as cracks, leading to enhanced fatigue effects during fretting progress. As the electrolytic voltage increased, the fretting wear mechanism of PEO coatings transitioned from adhesive wear and oxidative wear to abrasive wear and oxidative wear, then to slight deformation, and finally to significant fatigue wear and severe oxidative wear. At electrolytic voltages of 200&#xa0;V, 250&#xa0;V, 300&#xa0;V, and 350&#xa0;V, the fretting wear resistance of the substrate improved by approximately 1.9 times, 3.8 times, 7.3 times, and 1.2 times, respectively.</p>

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Fretting Wear Characteristic of Plasma Electrolytic Oxidation Coatings on TC4 Alloys: Influence of Electrolytic Voltage

  • 期刊论文

  • 发表日期：

    2025年2月17日

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  • Zhangyue Qin

摘要

The wear resistance of TC4 alloy is relatively poor, and fretting wear of TC4 alloy is inevitable in engineering applications. The PEO technology offers a potential solution for improving the fretting wear performance of TC4 alloy. By adjusting the electrolytic voltage, the PEO coating performance can be specifically improved. However, the fretting wear characteristics of PEO coatings on TC4 alloy under different electrolytic voltages remained unclear. Therefore, this paper thoroughly investigated the effect of electrolytic voltages on the fretting wear characteristics of PEO coatings on TC4 alloy. The results indicated that appropriately increasing the electrolytic voltage was beneficial for enhancing the hardness and density of the coatings, thereby reducing the friction coefficient and frictional dissipation energy, and improving the fretting wear resistance of PEO coatings. However, excessively high processing voltage increased porosity and introduced defects such as cracks, leading to enhanced fatigue effects during fretting progress. As the electrolytic voltage increased, the fretting wear mechanism of PEO coatings transitioned from adhesive wear and oxidative wear to abrasive wear and oxidative wear, then to slight deformation, and finally to significant fatigue wear and severe oxidative wear. At electrolytic voltages of 200 V, 250 V, 300 V, and 350 V, the fretting wear resistance of the substrate improved by approximately 1.9 times, 3.8 times, 7.3 times, and 1.2 times, respectively.