ABSTRACT

Plasma electrolytic oxidation (PEO) coatings on commercial pure titanium (Cp-Ti) and hot-dip aluminised Cp-Ti surfaces were prepared in an alkaline electrolyte. The morphological, structural, wear, and corrosion characteristics of the coatings were studied by using SEM, EDS, XRD, electrochemical polarisation, and dry sliding wear tests. The experimental results showed that the main compositions of the PEO coating on Cp-Ti are TiO₂ and Al₂TiO₅ phases, while the PEO coating on hot-dip aluminised (HDA’ed) Cp-Ti mainly consists of the Al₂O₃ phase. The single PEO coating exhibited more porosity with small diameter micro-pores compared to the PEO coating on the HDA’ed sample. Electrochemical polarisation tests revealed that the PEO coating on the HDA'ed sample exhibited approximately 4.6 times more polarisation resistance than the single PEO coating and 10 times that of the bare Cp-Ti sample. According to the wear test results, the wear resistance of the bare Cp-Ti was doubled by hot-dip aluminising (HDA) and PEO treatments, while the single PEO treatment resulted in better resistance against dry sliding wear.

摘要

在碱性电解液中制备商业纯钛 (Cp-Ti) 和热浸镀铝 Cp-Ti 表面上的等离子电解氧化 (PEO) 涂层。采用SEM、EDS、XRD、电化学极化和干滑动磨损试验研究了涂层的形态、结构、磨损和腐蚀特性。实验结果表明，Cp-Ti上PEO涂层的主要成分是TiO ₂和Al ₂ TiO ₅相，而热浸镀铝（HDA'ed）Cp-Ti上的PEO涂层主要由Al ₂ O组成。 ₃阶段。与 HDA 样品上的 PEO 涂层相比，单一 PEO 涂层表现出更多的孔隙率和小直径微孔。电化学极化测试表明，HDA 样品上的 PEO 涂层的极化电阻比单一 PEO 涂层高约 4.6 倍，是裸 Cp-Ti 样品的 10 倍。根据磨损测试结果，热浸镀铝 (HDA) 和 PEO 处理使裸 Cp-Ti 的耐磨性提高了一倍，而单独的 PEO 处理则具有更好的抗干滑动磨损能力。