Departamento de Química, Universidade Federal de São Carlos, C.P. 676, São Carlos, SP 13566-970, Brazil.
J Mater Sci Mater Med. 2011 Jul;22(7):1663-70. doi: 10.1007/s10856-011-4338-z. Epub 2011 May 12.
Surface properties and corrosion resistance analyses of Ti-13Nb-13Zr coated by an oxide film (obtained by micro-arc oxidation at 300 V) or an oxide/hydroxyapatite (HA) film are reported. HA films were biomimetically or electrochemically deposited on the alloy/oxide surface, and their properties compared. Both the biomimetic and the electrochemical method yielded rough and globular apatite surfaces (10-20 μm globules for the former and 1-2 μm for the latter). As inferred from XRD data, the electrochemical method yielded more biologic-like HA films, while the biomimetic method yielded films containing a mixture of calcium phosphate phases. Coated Ti-13Nb-13Zr samples were immersed in an aerated PBS solution and continuously analyzed during 49 days. Considering that, after immersion, the biomimetically deposited films presented smaller variations in thickness and morphology and higher electric resistance (determined by electrochemical impedance spectroscopy), they clearly provide significantly better protection to the Ti-13Nb-13Zr alloy when in PBS solution.
报告了经 300V 微弧氧化处理获得的氧化膜（TiO2 膜）或氧化膜/羟基磷灰石（HA）涂层 Ti-13Nb-13Zr 的表面性能和耐腐蚀性分析。在合金/氧化层表面仿生或电化学沉积了 HA 膜，并对其性能进行了比较。仿生和电化学两种方法均生成了粗糙的球状磷灰石表面（前者为 10-20μm 的小球，后者为 1-2μm）。根据 XRD 数据推断，电化学方法生成的 HA 膜更具有生物相似性，而仿生方法生成的膜则含有多种磷酸钙相。涂覆 Ti-13Nb-13Zr 样品在充氧 PBS 溶液中浸泡，并在 49 天内持续分析。考虑到浸泡后，仿生沉积的膜厚度和形态变化较小，电阻较高（通过电化学阻抗谱测定），因此当 Ti-13Nb-13Zr 合金在 PBS 溶液中时，仿生沉积的膜显然能提供更好的保护。
