The Effect of Anodizing Voltages on Properties of the Colored Ti-6Al-4V Alloy

In this research, color anodizing of Ti-6Al-4V alloy was done in phosphoric acid solution with concentration of 0.4 M at different voltages (10-120V) with a DC power supply. Structure of oxide layer was surveyed by X-ray diffraction. The structure of anodized layer in phosphoric acid solution with all applied voltages is consist of Ti from substrate and TiO2 (anatase). Due to change of anodizing voltages, the structure and color of anodized layer do not change. Color properties of barrier anodic oxide film has studied with E CIE L*a*b 1976 equation. Color stability of anodized samples was survayed by immersion in the Ringer's + 150 mM H2O2 solution. It can be seen that the most stable color is the sample anodized in 50V with E=1.57 and the sample anodized in 80V is the unstable color with E=1.57. The maximum lightness of color is related to 20V sample and the minimum lightness is related to 50V sample. J. Color Sci. Tech. 2(2008), 181- 190.© Institute for Colorants, Paint and Coatings.