はく離したAlアノード酸化皮膜に塗装した複合皮膜の光学的性質

概要

論文の詳細を見る
Aluminum plate of 99.87% purity was anodized at a constant voltage of 16.00V d.c. in 1.5mol·dm-3 sulfuric acid at 20°C. The oxide film was detached and either the porous layer or the barrier layer was coated by dipping in acrylic melamine resin. Organic films were obtained by chemical dissolution the oxide films constituent of the composite films.The goniometric transmittance of the composite films obtained by coating the barrier layer was equal to the value for the detached oxide films. The goniometric transmittance of the organic films was similar to the value calculated from Fresnels equation by assuming the refractive index of the organic films to be 1.55.Meanwhile, the goniometric transmittance of the composite films which were coated on the porous layer was clearly decreased at an incident angle of 10°∼35°. In these composite films, the goniometric transmittance of the organic films was obviously lower than that of the original composite films and they were opaque in appearance.Microscopic observation showed that the surface of the organic films attached to the porous layer had numerous dents. The opaqueness of the composite films seemed to be due to degradation of the organic films by H3O+, HSO4- and SO42- ions in the pores or on the cell walls.
社団法人表面技術協会の論文