Improved Wear and Corrosion Resistance of Microarc Oxidation Coatings on Ti–6Al–4V Alloy with Ultrasonic Assistance for Potential Biomedical Applications,Advanced Engineering Materials

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Improved Wear and Corrosion Resistance of Microarc Oxidation Coatings on Ti–6Al–4V Alloy with Ultrasonic Assistance for Potential Biomedical Applications
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2021-01-14 , DOI: 10.1002/adem.202001433
Cheng Xu ₁ , Liang-Yu Chen ₁ , Chuan-Bo Zheng _{1,

2} , Hong-Yue Zhang ₁ , Cui-Hua Zhao ₃ , Ze-Xin Wang ₁ , Sheng Lu ₁ , Jin-Wei Zhang ₁ , Lai-Chang Zhang ₄

Affiliation

Although microarc oxidation is frequently used in producing wear‐ and corrosion‐resistant coatings on Ti and Ti alloys for biomedical applications, the formation of nonuniform microstructure of the coatings is still unavoidable. To overcome this drawback, this work adopts ultrasonic assistance in the microarc oxidation of Ti–6Al–4V and systematically investigates the influences of ultrasonic treatment with different durations on the coating microstructures and resultant properties. The positive effects of ultrasonic, such as cavitation effect, sound flow effect, and mechanical effect, accelerate the cooling rate of electrolyte and promote the homogeneity of the solute on the sample surface. Therefore, the ultrasonic‐assisted coatings exhibit uniform microstructures with fewer cracks and therefore improve performances. For instance, compared with the counterpart without ultrasonic assistance, the ultrasonic‐assisted coating with 15 min duration demonstrates 25.1% lower mass loss in the tribology test and half corrosion density in Hank's solution. Such results indicate that ultrasonic assistance in microarc oxidation of Ti–6Al–4V can homogenize the microstructures of coatings and enhance their corrosion resistance and wear resistance in human body.

中文翻译：

潜在的生物医学应用通过超声辅助改善了Ti-6Al-4V合金上微弧氧化涂层的耐磨性和耐蚀性

尽管微弧氧化常用于在生物医学应用的Ti和Ti合金上生产耐磨和耐腐蚀涂层，但仍不可避免地形成涂层的微观结构不均匀。为了克服这个缺点，这项工作在Ti-6Al-4V的微弧氧化中采用了超声辅助，并系统地研究了不同持续时间的超声处理对涂层微观结构和最终性能的影响。超声波的积极作用，例如空化作用，声流作用和机械作用，可加速电解质的冷却速度并促进样品表面上溶质的均匀性。因此，超声辅助涂层具有均匀的微观结构，裂纹更少，因此可以改善性能。例如，与没有超声辅助的情况相比，持续15分钟的超声辅助涂层在摩擦学测试中的质量损失降低了25.1％，在汉克溶液中的腐蚀密度降低了一半。这些结果表明，超声辅助Ti-6Al-4V的微弧氧化可以使涂层的微观结构均匀化，并增强其在人体中的耐蚀性和耐磨性。

更新日期：2021-01-14

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