Electrochemical corrosion analyses and characterization of surface-modified titanium

Abstract Titanium (ASTM F76) samples received three different surface treatments after which the resulting oxides were characterized and the corrosion behavior was evaluated. No differences in the corrosion potential ( E corr ) were observed for the non-passivated and passivated Ti samples. However, the anodized Ti samples exhibited a significantly more noble E corr . At potentials higher than E corr , significant differences in current densities were observed for all three different Ti surfaces, with lower current densities observed for anodized Ti samples as compared to the non-passivated and passivated Ti samples. X-ray photoelectron spectroscopy indicated predominantly TiO 2 on all Ti surfaces, with a higher concentration of carboxyl species for the anodized Ti surfaces as compared to the non-passivated Ti surfaces. Auger electron spectroscopy revealed a 10-fold thicker oxide layer for anodized Ti surfaces as compared to non-passivated and passivated Ti surfaces.