アルミニウム三次電解着色皮膜の色調変化

抄録

The films colored by a three-step electrolytic coloring method were examined with respect to influence of ultraviolet irradiation using transmission electron microscopy (TEM) and color difference measurement, and the results were compared with those of films colored by a two-step electrolytic coloring method. The three-step electrolyitic coloring films were discolored by the ultraviolet application from a ultraviolet irradiator. TEM observation revealed that the ultraviolet irradiation little affected the thickness of the barrier layer or uniform electrodeposit layer in an AC anodic oxide film. This indicates that the change of the optical path length producing the chromatic color did not result. The results of measurement using a color difference meter indicate an increase of reflected light and a slight hue change from the short-wavelength side to the long-wavelength side (a gray tinged blue to a little light gray). This change of the color tone was attributed not to a change in the path length difference, but rather to a change in the optical intensity difference suitable for interference.