ABSTRACT Ceramic coatings containing calcium and phosphorus were prepared on the surface of Ti-3Zr-2Sn-3Mo-25Nb by micro-arc oxidation. The effects of Ca/P ratio, oxidation time, current density and duty ratio on the coating were studied by orthogonal experiment under a phosphate electrolyte to determine the optimal process parameters. To analyse the effects of NaF additions, 1 g L−1, 2 g L−1, 3 g L−1, 4 g L−1 and 5 g L−1 NaF were added into the electrolyte, respectively. From analysis, the authors draw the following conclusions: NaF can improve the conductivity of electrolyte and facilitate the densification of coating; the hardness, thickness and roughness of the coating have been improved to some extent; the most obvious improvement to the coating is effected by adding 3 g L−1 NaF into the electrolyte. Furthermore, passivation has occurred on the MAO-NaF-coatings immersed in simulated body fluids. The most improved corrosion resistance of the MAO-oxidation coating is gained by adding 3 g L−1.

中文翻译：

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微弧氧化Ti-3Zr-2Sn-3Mo-25Nb复合陶瓷涂层工艺参数优化及表征

摘要 采用微弧氧化法在 Ti-3Zr-2Sn-3Mo-25Nb 表面制备了含钙和磷的陶瓷涂层。在磷酸盐电解液下通过正交试验研究Ca/P比、氧化时间、电流密度和占空比对涂层的影响，确定最佳工艺参数。为了分析添加 NaF 的影响，分别在电解液中添加了 1 g L-1、2 g L-1、3 g L-1、4 g L-1 和 5 g L-1 NaF。通过分析，作者得出以下结论：NaF可以提高电解液的电导率，有利于涂层的致密化；涂层的硬度、厚度和粗糙度都有一定的提高；通过在电解液中添加 3 g L-1 NaF 可以实现对涂层最明显的改进。此外，浸入模拟体液中的 MAO-NaF 涂层发生钝化。通过添加 3 g L-1，MAO 氧化涂层的耐腐蚀性能得到最大改善。