Abstract
Ti-6AI-4V samples were anodised in a 5% H2SO4 solution, in a saturated calcium phosphate solution (SCP), in Hank's solution and in a simulated human blood plasma, under potentiostatic control at respectively 15–65V (H2SO4) and 2.5–7.5 V (other solutions), for 10–30 minutes. Corrosion behaviour was studied in Hank's solution. A decrease in the corrosion rate was achieved with increasing anodising potentials, as determined by Tafel analysis. Oxide layers were characterised using SEM/EDS and thin film XRD. Layers were porous and seemed to be composed of a TiO2-Ti2O3 mixture. It was possible to correlate anodising parameters with film thickness and corrosion behaviour. The incorporation of Ca and P in the film was accomplished in SCP although a much less stable film than that produced in %5 H2SO4 was obtained.
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