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配制含5%、20%和33%(摩尔分数)钽的二氧化钛溶胶,采用浸提法在表面粗化的Ti6Al4V合金表面涂覆含钽TiO2溶胶-凝胶薄膜。经过1.5 mol/L NaOH-HCl预处理基体表面的含钽TiO2薄膜附着较好,但含33%Ta的试样出现了裂纹。X射线光电子谱分析表明,钛和钽在薄膜中以TiO2、Ta2O5形式存在,未检测到铝元素。X射线衍射和拉曼散射分析表明,钽的加入降低了膜层的结晶性。在无钙Hank’s平衡盐液中的动电位极化实验表明,与抛光试样相比,涂层试样的耐蚀性显著改善。钽的加入对涂层试样的紫外光致亲水性转变有阻碍作用。含20%Ta的试样具有足够的膜层完整性和亲水性转化速率,可望具有较好的生物学性能。
A titanium dioxide sol containing 5%, 20% and 33% (mole fraction) tantalum was prepared and the tantalum dioxide sol-gel film was coated on the surface roughened Ti6Al4V alloy by leaching method. The tantalum-containing TiO2 film pretreated with 1.5 mol / L NaOH-HCl adhered well, but the specimen containing 33% Ta cracked. X-ray photoelectron spectroscopy analysis shows that titanium and tantalum are present in the film as TiO2 and Ta2O5, and no aluminum element is detected. X-ray diffraction and Raman scattering analysis showed that the addition of tantalum reduced the crystallinity of the film. Potentiodynamic polarization experiments in calcium-free Hank’s balanced salt solution show that the corrosion resistance of the coated samples is significantly improved compared to polished samples. The addition of tantalum hindered the UV-induced hydrophilic transition of the coated samples. Samples containing 20% Ta have adequate membrane integrity and hydrophilic conversion rate, and are expected to have better biological properties.