[China Aluminum Industry Network] The membranes obtained by the anodic oxidation methods such as the sulfuric acid method, oxalic acid method, or chromic acid method have porosity and therefore have strong adsorptivity, so when in contact with oils, lipids, or any coloring matter , it is easily contaminated. This kind of film is mainly amorphous aluminum oxide. The strong adsorption property is the characteristics of aluminum oxide. In order to obtain a bright, bright film layer, the film layer before dyeing should first be required to have the following conditions:
(1) The film has a suitable thickness, and when it is dark, it is required to have a thick film (above 12μm);
(2) The film should have proper porosity and adsorption;
(3) The film itself should be colorless and transparent;
(4) The surface of the aluminum part to be oxidized should not have nicks, holes, and impurity stripes, and the crystal phase structure should not be different, such as grain expansion or deflection.
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