Influence of incremental rate of anodising current on roughness and electrochemical corrosion of oxide film on titanium alloy Ti–10V–2Fe–3Al

Abstract

In this study, the influence of incremental rate of anodising current V_IR on the crystal structure, surface roughness and corrosion resistance of anodic oxide films on Ti–10V–2Fe–3Al was studied using Raman spectroscopy, atomic force microscopy (AFM), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarisation. The results showed that the surface roughness, crystal structure and electrochemical corrosion behaviour of anodic oxide films were remarkably affected by different V_IR with regard to the change in the rate of anodising voltage. In addition, results of EIS and potentiodynamic polarisation revealed that the film that formed at V_IR of 0··50 A min⁻¹ had the highest corrosion resistance. Quantitative AFM characterisation showed good correlation between surface roughness and EIS results. Furthermore, results of Raman spectroscopy showed that the relative intensity of anatase and rutile had a tendency to increase with a decrease in V_IR before reaching 0··50 A min⁻¹.