Alアノード酸化皮膜の電解着色におけるマロン酸の添加効果

摘要

The electrolytic coloring process called 2-step color is one of the major methods to color anodized aluminum oxide (AAO) film. Malonic acid is emerged as a novel stabilizing agent of cobalt ion in electrolytic coloring solvent of AAO film. Metallic cobalt is efficiently deposited into pore of AAO film by electrochemical reduction of cobalt ions in the electrolytic coloring solvent (CoSO_4/malonic acid aqueous solution). The optimum condition of coloring solvent is determined by changing electrolyte concentration, Ph, bath voltage, and electrolytic time. The Co-deposited AAO film show beautiful black color on the whole surface. The developed coloring solvent can be repeatedly used to obtain beautiful colored Co-deposited AAO films.%Alをアノードとして，酸性や塩基性の溶液中で直流電解すると，Al基板上に多孔質の酸化皮膜が形成される。さらに，このアノード酸化皮膜を金属塩の溶液中で交流電解すると，多孔質アノード酸化皮膜の細孔中に金属が電析して皮膜が着色される。