Herein, a biomimetic coating of hydroxyapatite (HA)–Al₂O₃ and HA–ZrO₂ was deposited on Ti–6Al–4V-alloy using vacuum plasma spray (VPS) technique. The bond-coat of ZrO₂ has been introduced between the substrate and reinforced HA coatings to study the effect of bond-coat on structural, mechanical properties and electrochemical corrosion performance of the developed coatings. In addition, the impact of thermal treatment of coating was investigated on these properties too. Coating characteristics, such as morphology, porosity, surface roughness, and crystallinity were investigated. The corrosion performance of coatings was tested in Hank’s-based salt solution (HBSS). Significant enhancement in crystallinity and surface-hardness has been witnessed after heat treatment; nevertheless, porosity reduced. The electrochemical corrosion study revealed that the corrosion resistance of heat-treated samples was better than the as-sprayed coatings samples. The intensity of XRD peaks of all coatings increased after 24h immersion in HBSS for the electrochemical test in comparison to the intensity of peaks before the corrosion test.

中文翻译：

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真空等离子喷涂技术沉积的热处理增强 HA 涂层的表征和电化学腐蚀分析

在此，使用真空等离子喷涂 (VPS) 技术在 Ti-6Al-4V 合金上沉积羟基磷灰石 (HA)-Al ₂ O ₃和 HA-ZrO ₂的仿生涂层。_{ZrO 2}的粘结层已经在基材和增强 HA 涂层之间引入，以研究粘合涂层对开发涂层的结构、机械性能和电化学腐蚀性能的影响。此外，还研究了涂层热处理对这些性能的影响。研究了涂层特性，例如形态、孔隙率、表面粗糙度和结晶度。在汉克盐溶液（HBSS）中测试了涂层的腐蚀性能。热处理后结晶度和表面硬度显着提高；然而，孔隙率降低了。电化学腐蚀研究表明，热处理样品的耐腐蚀性优于喷涂涂层样品。所有涂层的 XRD 峰强度在 24 年后都有所增加h 浸入 HBSS 进行电化学测试，与腐蚀测试前的峰强度进行比较。