采用冷喷涂法在AZ91合金表面预置纯Ti涂层,再采用微弧氧化对Ti涂层进行仿生生物改性.用SEM、XRD、EDS等方法分析涂层的组织结构,用动电位法测试涂层的腐蚀学性能.结果表明:冷喷涂预置Ti层厚度约100 μm,外表面形貌粗糙.微弧氧化处理后在Ti层表面产生微弧放电孔.生物改性层主要由Ti_2O_3组成,还含有少量钙、磷等物质.微弧氧化层有利于提高冷喷涂Ti层的生物学活性和致密性.含Ti复合涂层显著提高AZ91合金在模拟体液(SBF)中的自腐蚀电位(提高了约0.3 V),表明含Ti生物复合涂层具有良好的抗腐蚀性能.
The pure Ti layer was presetted on AZ91 surface by cold spraying; consequently the top Ti layer was subjected to the microarc oxidation treatment to enhance the bioactivity. The microstructure of coatings on Mg alloy was examined using SEM, XRD and EDS methods. The corrosion resistance of the A291 alloy with Ti coating in simulated body fluid (SBF) was evaluated by dynamic potential polarizing test. The results show that the presetted Ti layer, with about 100 μm thickness, is rather rough in the surface. After microarc oxidation treatment, a thin film with rather fine discharging pores was formed on the Ti layer surface. The newly formed film is mainly composed of Ti_2O_3 phase, also containing a small amount of amorphous component such as Ca and P. The micoarc oxidation treatment is helpful to improve the bioactivity and density of Ti layer. The self-corrosion potential of composite coating containing Ti is increased by about 0.3 V in SBF, which indicates that the corrosion resistance capacity is improved.
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