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研究了复合氧化工艺在Ti-6Al-4V(TC4)钛合金表面制备多孔TiO_2氧化膜层的工艺和性能。在乙酸钙和磷酸二氢钾电解体系中,运用阳极氧化法、微弧氧化和复合氧化方法在TC4钛合金表面制备了多孔生物陶瓷TiO_2氧化膜层,并讨论了电解液浓度(Ca/P)、成膜电压和成膜时间等参数对膜层膜厚、硬度及粗糙度等性能的影响。采用X射线衍射仪、显微硬度计、便携式粗糙度仪、扫描电镜和电化学工作站等仪器分析了表面TiO_2膜层的物相组成、显微硬度、粗糙度、耐腐蚀性和显微形貌及其结构。研究结果表明:采用恒压阳极氧化技术,在TC4表面可形成一层光滑致密氧化膜层,该膜层粗糙度比预处理过的钛合金表面大0.05μm,厚2~10μm,显微硬度为3200MPa(HV)左右,比钛合金显微硬度3100MPa(HV)略大。再在阳极氧化膜层的基础上进行复合氧化,可以在TC4表面形成具有良好耐腐蚀性的多孔TiO_2膜层。膜层的硬度可以达到7000MPa(HV),厚度达到64μm。
The process and properties of porous TiO 2 oxide film on Ti-6Al-4V (TC 4) titanium alloy were studied. In the calcium acetate and potassium dihydrogen phosphate electrolysis system, the porous bioceramic TiO 2 oxide film was prepared on TC4 titanium alloy by anodic oxidation, micro-arc oxidation and composite oxidation. The effects of electrolyte concentration (Ca / P) , Filming voltage and filming time and other parameters on the film thickness, hardness and roughness properties. The phase composition, microhardness, roughness, corrosion resistance and micro-morphology of the surface TiO_2 film were analyzed by X-ray diffraction, microhardness tester, portable roughness tester, scanning electron microscope and electrochemical workstation. And its structure. The results show that a smooth and dense oxide film can be formed on the surface of TC4 by constant voltage anodic oxidation. The roughness of the film is 0.05 μm thick and 2 ~ 10 μm thick compared with that of the pretreated titanium alloy. The microhardness is 3200MPa (HV), slightly higher than the microhardness of titanium alloy 3100MPa (HV). On the basis of the anodized film, the composite oxide is oxidized to form a porous TiO 2 film with good corrosion resistance on the TC 4 surface. The hardness of the film can reach 7000MPa (HV), the thickness reaches 64μm.