Anodized Aluminum Film

Anodic oxide film consists of two layers, the thick porous outer layer is grown on a dense inner layer with dielectric properties, the latter is called the barrier layer (also known as the active layer). The barrier layer is composed of anhydrous A12O3, which is thin and dense with high hardness and prevents current from passing through. The porous outer layer of the oxide film is mainly composed of amorphous A12O3 and a small amount of R-A12O3.H2O also contains anions of the electrolyte.

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