多層膜干渉を利用したアルミニウム陽極酸化皮膜の発色機構

抄録

Interference coloring of anodized aluminum is the result of a sophisticated electrolytic process of anodizing, anodic pore widening (pore modification), metal electrodeposition into modified pores, and final reanodizing (or not). Due to this sequence, the anodic film consists of four layers differing in optical property and thickness.
This investigation was made by regarding a portion consisting of metal deposits and oxide as a single uniform layer in the anodic film with a complex reflective index specified by that of metal and the volume fraction of metal to oxide to propose a comprehensive optical model for interference color.
In this model, variables affecting color other than the reflective index are thickness of both the metal deposit layer and oxide between the deposit and base aluminum, which depend on electrolysis conditions.
The model was studied for several interference colors produced in different electrolyses and found to be in good agreement.