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Aluminum alloy surface is easy to generate a very thin layer of alumina membrane, has certain corrosion resistance, but as a result of this layer of oxide film is a crystal, the lost original luster on the surface of the aluminum, in addition, this kind of porous oxide film, uneven, corrosion resistant ability is not strong, easily stained smear, so, aluminum alloy products after oxidation coloring, make matrix set solid, colour and lustre and thickness are meet the requirements and which has the best corrosion resistance, wear resistance, weather resistance, good performance of artificial membrane.The appearance of the product after oxidized is more acceptable to customers.