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Surface pre-treatments of Ti-Nb-Zr-Ta beta titanium alloy: The effect of chemical, electrochemical and ion sputter etching on morphology, residual stress, corrosion stability and the MG-63 cell response

2021; Elsevier BV; Volume: 28; Linguagem: Inglês

10.1016/j.rinp.2021.104613

2211-3797

Petr Vlčák, Jaroslav Fojt, Jan Koller, Jan Drahokoupil, Vojtěch Smola,

Advanced materials and composites

• Surface properties of Ti-35Nb-7Zr-5Ta alloy with various pre-treatments have been investigated. • Morphological changes in macroscale and in microscale have been observed. • The corrosion resistance was significantly reduced after ion sputter etching. • MG-63 cells adhered well on surfaces that had been pre-treated in various ways. Pre-treatment methods for titanium alloys are of great importance, both as regards the treatment of the surfaces of the implant and as regards the pre-deposition phase of the coating processes and the surface modifications. We have investigated the impact of chemical, electrochemical and ion sputter etching on the surface properties, the corrosion stability and the MG-63 cell response of Ti-35Nb-7Zr-5Ta alloy. In the initial state, the samples have a mechanically polished surface. The pre-treatments that were applied led to significant morphological changes in microscale and also in nanoscale. The wettability of the pre-treated surfaces varied from hydrophilicity to hydrophobicity. Changes in contact angle were controlled by surface chemistry rather than changes in morphology and roughness. Native oxides and suboxides of alloying elements with a predominant amount of Nb 2 O 5 were found to provide high corrosion stability of Ti-35Nb-7Zr-5Ta alloy after mechanical polishing, after chemical etching and after electrochemical etching. Significantly reduced corrosion resistance in a physiological saline solution was observed for the ion sputtered surface. A decreasing trend in the cell spreading area correlated with increasing surface roughness and decreasing polarization resistance. There is discussion of the causes of the changes in surface properties and cell behaviour.