The current metallic biomaterial still presents failures associated with the bulk alloy and the interface of material/human body. In previous studies, titanium alloy with tantalum showed the elastic modulus decrease in comparison with that of commercially pure (cp) titanium. In this study, surface modification on Ti-30Ta alloy was investigated. Titanium and tantalum were melted, homogenized, cold-worked by a rotary swaging process and solubilized. The anodization process was performed in electrolyte contained glycerol + NH₄F 0.25% at 30 V using seven different durations—4 h, 5 h, 6 h, 7 h, 8 h, 9 h, and 10 h and annealed at 530 °C for 1 h. The surface topography was characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM) measurements, X-ray diffraction analysis (XRD), and contact angle. From the results, we conclude the time of anodization process influences the shape and morphology of the anodized layer. The 5 h-anodization process produced a smooth and porous surface. The 4-, 6-, 7-, 8-, 9-, and 10-h conditions showed nanotubes morphology. All surfaces are hydrophilic (<90°). Likewise, all the investigated conditions present anatase phase. So, this surface modification presents potential for biomedical application. However, more work needs to be done to better understand the influence of time on the anodization process.

中文翻译：

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Ti-30Ta合金阳极氧化参数的优化

当前的金属生物材料仍然表现出与块状合金和材料/人体界面相关的失效。在以前的研究中，与商业钛（cp）相比，含钽的钛合金的弹性模量下降。在这项研究中，对Ti-30Ta合金的表面改性进行了研究。钛和钽熔化，均质，通过旋转型锻工艺冷加工并溶解。在含甘油+ NH _4的电解质中进行阳极氧化工艺在30 V下使用7个不同的持续时间（4小时，5小时，6小时，7小时，8小时，9小时和10小时）的F 0.25％，并在530°C下退火1小时。通过扫描电子显微镜（SEM），原子力显微镜（AFM）测量，X射线衍射分析（XRD）和接触角来表征表面形貌。根据结果​​，我们得出结论，阳极氧化过程的时间会影响阳极氧化层的形状和形态。5 h阳极氧化过程产生了光滑多孔的表面。4、6、7、8、9和10小时条件显示了纳米管的形态。所有表面均为亲水性（<90°）。同样，所有研究的条件都呈现锐钛矿相。因此，这种表面修饰为生物医学应用提供了潜力。但是，需要做更多的工作才能更好地了解时间对阳极氧化工艺的影响。