The motivation of this work is to compare methods for nanotube formation in α-Ti with the results obtained in β-TiNi by electrochemical anodization at the same conditions. Both substrates were characterized by XRD to assure their phase constitution at room temperature. Samples were anodized in 0.2%m. NH₄F and 1%v. H₂O in ethylene glycol solvent at 5, 15, 25, 45, and 60 V. Each experimental condition had its current densities recorded as a function of time and the resultant anodic films were characterized by FE-SEM. All conditions lead to nanotube formation in Ti substrates. TiNi samples anodized at 5 V produced evenly spread nanotubes with similar diameters of those in Ti. As the potential increased, the nanotubular aspects of titania in TiNi were increasingly lost. At higher anodization potentials, tubular structures can be seen in a matrix of sponge-like oxide formed due to the increase of oxygen evolution as the potential increased. Examination of the metal/oxide interface indicates that, even though spongy oxide was formed in TiNi substrates, the mechanism of growth initiation is similar to Ti samples. It is possible to conclude that for the same anodization conditions β-TiNi is more reactive than α-Ti and requires milder conditions to produce nanotubular surfaces.

这项工作的目的是将在相同条件下通过电化学阳极氧化在α-Ti中形成纳米管的方法与在β-TiNi中获得的结果进行比较。通过XRD对两种基材进行表征，以确保其在室温下的相组成。样品在0.2％m中进行阳极氧化。NH ₄ F和1％v。高₂O在5、15、25、45和60 V的乙二醇溶剂中。每个实验条件的电流密度都记录为时间的函数，并且通过FE-SEM对所得的阳极膜进行表征。所有条件都导致在Ti基片中形成纳米管。在5 V电压下进行阳极氧化的TiNi样品产生的纳米管均匀分布，直径与Ti中的相似。随着电势的增加，TiNi中二氧化钛的纳米管方面越来越少。在较高的阳极氧化电势下，可以看到海绵状氧化物的基质中形成管状结构，这是由于随着电势的增加氧气释放的增加而形成的。对金属/氧化物界面的检查表明，即使在TiNi基片中形成了海绵状氧化物，其生长起始机理也与Ti样品相似。