Curvatures of Anodized Coatings of Aluminum

Porous layer growth on anodized coatings develops not only from internal stress but also varies according to residual stress on the anodized coating. The results of observation of the deformation of curvatures of foils anodized one side and on both sides were as follows. 1) Internal stress is subject to tensile stress as the porous layer grows. 2) Curvature deformation is large in cases of high bath temperature or thick layer, but isn't always proportional to the strength of internal stress.