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The aim of this study was to obtain the second generation TiO2 nanotubes on the Ti13Nb13Zr alloy. Anodic oxidation of the alloy under study was carried out in 1 M (NH4)2SO4 electrolyte under voltage-time conditions of 20 V for 120 min. The morphological parameters of the obtained nanotubes of second generation such as the length (L), internal (Di) and outer (Do) diameter of nanotube were determined. It was found that the anodic oxidation of the Ti13Nb13Zr alloy conducted under proposed conditions allowed to obtain the single-walled nanotubes of the following geometrical parameters: the internal diameter 61 nm, outer diameter 103 nm, and the length 3.9 µm. The total surface area of the single-walled nanotubes was equal to 4.1 µm 2 , and the specific surface area per cm 2 (As) was estimated to be 15.6 cm 2 /cm 2 . Formation mechanism, structure and optimal morphological parameters of the obtained single-walled nanotubes on the Ti13Nb13Zr alloy have been discussed in detail.

In this work, the Ti13Zr13Nb shape memory alloy that was naturally passivated in air has been studied towards long‐term corrosion performance in the physiological saline solution. The electronic impedance spectroscopy method was used to detailed study on the electrolyte|passive layer interfacial properties. The equivalent electrical circuit for the pitting corrosion was applied, and the discussion on the electrolyte|electrode interfacial properties was realized with respect to the physical meaning of the used circuit elements. The study shows that the Ti13Zr13Nb alloy is characterized by high corrosion resistance. ESI measurements revealed the formation of a protective oxide film on the Ti13Zr13Nb surface, during 20 days of exposure in 0.9% NaCl solution at 37°C. In the early days of immersion, there was a slight decrease in corrosion resistance, which in the next 15 days remained unchanged, indicating very good protective properties of the formed oxide film. Performed research indicates that the Ti13Zr13Nb alloy is promising biomaterial to medical applications. Copyright © 2014 John Wiley & Sons, Ltd.

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