Electrochemical Behavior Analyses of Anodic Oxide Film Obtained on TA2 Pure Titanium in Sulfuric Acid Electrolyte

Abstract

Anodic oxide films on pure titanium surface were prepared with potentiostatic method in the 10% sulfuric acid electrolyte. The chrono-amperometric curve, potentiodynamic polarization curve, electrochemical impedance spectroscopy and Mott-Schottky curve of anodic oxide films were obtained using an electrochemical method in 3.5% NaCl solution. The results show that colorful, flat and smooth anodic oxide films are obtained in the experimental processing parameters. Chrono-amperometric curve shows that formation of oxide film is the process of dynamic growth and dissolution. The potentiodynamic polarization curves and electrochemical impedance spectra show that TA2 pure titanium has better corrosion resistance after anodizing, and the higher the anodic oxidation voltage, the better corrosion resistance. Mott-Schottky curves show that anodic oxide film is an n-type semiconductor. The donor concentration decreases with increasing potential, the corrosion resistance increases.