Corrosion behavior of an oxide nanotube-coated β-type Ti-45Nb implant alloy in a simulated inflammatory solution
Marina Roshchina, Christine Joy Querebillo, Evgenia Dmitrieva, Andrea Voß, Noel Israel, Thomas Gemming, Lars Giebeler, Stefan Pilz, Stefan Roeher, Volker Hoffmann, Martin Hantusch, Inez M. Weidinger, A. Gebert
Abstract
Oxide nanotube (ONT) layers were anodically grown on β-type Ti-45Nb and crystallized at 450°C to anatase (Ti,Nb)O2. A corrosion analysis in normal and inflammatory phosphate buffered saline (PBS) comprised electrochemical polarization studies, metal release analysis, UV-Vis and EPR measurements. In inflammatory PBS with 0.5 wt. % H2O2 (pH 5.0) amorphous ONT degraded, while crystallized ONT were most stable with lowest release. Their barrier-type behavior is attributed to their ordered crystalline nature and a fusion layer. As-ground Ti-45Nb surfaces were most reactive with highest corrosion and metal release rates. Mainly •OH radical-coordinated Ti(IV)-H2O2 complexes were detected in immersion solutions.