ANODIC OXIDATION METHOD FOR COLORED TITANIUM MATERIAL

摘要

PURPOSE:To form an anodized film having desired colors by selecting an anodic oxidation voltage according to the characteristic curve of the colors of the color tones and saturations shown in Adam-Nickerson's color space and the anodic oxidation voltage at the time of forming the beautiful colors by an anodic oxidation method on the surface of Ti. CONSTITUTION:The rolling mill lubricant, etc., on the surface of a Ti plate are removed by degreasing, cleaning and rinsing; thereafter, the Ti plate is immersed into an aq. hydrofluoric acid soln. and is then rinsed. This plate is immersed into a soln. mixture composed of hydrofluoric acid and hydrogen peroxide and after the plate is rinsed, the plate is immersed as an anode 3 into an aq. 1wt.% phosphoric acid soln. in an electrolytic cell 1. The anode Ti plate 3 is anodized by supplying electricity between the anode and a cathode 2 made of the Ti plate from a DC power supply. The anodic oxidation treatment is executed by impressing the anodic oxidation voltage corresponding to the desired colors selectively between the electrodes by the relation characteristic curve of the colors of the color tones and saturations shown in the Adam- Nickerson's color space and the anodic oxidation voltage.