Abstract
β-type Ti alloys composed of non-toxic alloying elements (Ta, Mo, Nb and Si) are highly considered for biomedical applications due to their excellent mechanical properties and better biocompatibility compared to other implant materials. The performance of Ti alloy-based implants is also dependent on their surface properties, which can be optimized by nanotube growth through anodizing treatment. In this study, β-type Ti-10Mo-(0, 0.5, 1.5)Si alloys were produced, treated thermally and further anodized at 5, 10, 20 and 40 V for 6 h aiming at evaluating the effects of the Si concentration and anodizing voltage on the formation of nanostructured surface layers and corrosion resistance of Ti alloys. The inclusion of Si reduced the ω-phase precipitation extent, thus making the β-phase more stable, but it led to intermetallic Ti3Si phase formation. The Si addition also refined the β-phase grain size. The best corrosion resistance in SBF was obtained for the Ti alloys included with 0.5 wt% of Si. The best TiO2 nanotube growth condition was found to be at anodizing voltages of 10 V, regardless of the Si concentration. Nevertheless, the alloys with nanopore-assembled surface obtained at 5 V were more efficient against electrochemical corrosion.
Published Version
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