ELECTROCHEMICAL CORROSION ANALYSES AND CHARACTERIZATION OF SURFACE-MODIFIED TITANIUM

Titanium (ASTM F76) samples received three different surface treatment s after which the resulting oxides were characterized and the corrosio n 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 i n current densities were observed for all three different Ti surfaces, with lower current densities observed for anodized Ti samples as comp ared to the non-passivated and passivated Ti samples. X-ray photoelect ron spectroscopy indicated predominantly TiO2 on all Ti surfaces, with a higher concentration of carboxyl species for the anodized Ti surfac es as compared to the non-passivated and passivated Ti surfaces. Auger electron spectroscopy revealed a 10-fold thicker oxide layer for anod ized Ti surfaces as compared to non-passivated and passivated Ti surfa ces.