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The relationship between aluminum model and film speed

Different types of aluminum, after conducting chemical conversion film different exterior color difference than other different formulation were more obvious. High purity aluminum, film forming speed is slow; aluminum low purity, contrast. So when oxidized under different aluminum to master the different. To do this, aluminum parts of different types are not allowed in the same string binding, so therefore cannot control their proper oxidation time.
The quality of aluminum components can be distinguished from the alkali corrosion, such as alkali corrosion of parts surface had a black film, or red film is inevitable with silicon or copper containing high aluminum, chemical on the aluminum into membrane time should be shortened, otherwise, the film will not satisfy the conductivity requirements.