| 摘要 |
PURPOSE:To execute effectively coloring of an Al material in a short period by controlling be densification of a color tone within a range of the first and the second voltage values corresponding to the first and the second peak current values, when applying a DC voltage to the Al material by a 1/4 sine curve method. CONSTITUTION:When coloring an Al material which has been brought to an anodic oxidation treatment, by applying a DC voltage in an electrolytic bath, it is executed by raising successively the applied voltage by a 1/4 sin curve method. In this case,when the applied voltage is set to the first voltage Iv and the second peak voltage value IIv corresponding to the first peak current value Ii and the second peak current value IIi, the electrolytic coloring is started by the first peak voltage value Iv, and the coloring is stopped by the second peak voltage value IIv. In this case, in this area, the color tone becomes dense as the time elapses, therefore, the color tone is controlled by controlling the time.
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