Potential dependent mechanism of the composition and electrochemical property of oxide films of Ti-6Al-3Nb-2Zr-1Mo.

Potential dependent mechanism of the composition and electrochemical properties of oxide films formed on Ti-6Al-3Nb-2Zr-1Mo in 0.5 M H 2 SO 4 at potential ranging within −0.80–5.00 V was studied. The quantitative calculation and qualitative analysis of thicknesses of oxide films and valence states of Ti and Al, Nb, Mo increase with potential increasing to 3.00 V, whereas surface roughness illustrates the opposite trend. The corrosion resistances and semiconductor properties results indicate better protection effect and uniformity of oxide film at higher potential in passive region. A schematic considering alloying elements effect within oxide films formed at different applied potential on Ti-6Al-3Nb-2Zr-1Mo is established. • The thickness of oxide film and valence state of Ti, Al, Nb, Zr, Mo are quantitatively calculated and qualitatively analyzed. • Schematic model of the oxide films formed on Ti80 at different potentials is proposed. • The composition for most corrosion resistant oxide film formed at applied potential of 3.0 V is declared. [ABSTRACT FROM AUTHOR]