Anodized aluminum oxide film structure and properties
The Anodized aluminum is surrounded by dense to form a honeycomb hexagonal body called a unit cell, and the entire film layer is composed of a myriad of such unit cells. When the electrolyte is sulfuric acid, the sulfate content in the film layer is normally from 13% to 17%. The porous outer layer of the oxide film is mainly composed of amorphous alumina and a small amount of hydrated alumina, and further contains a cation of the electrolyte. Most of the excellent properties of the oxide film are determined by the thickness and porosity of the porous outer layer, which are all closely related to the anodization conditions.
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