[China Aluminum] In the process of hard anodizing, when the concentration of harmful components in the aluminum alloy exceeds the allowable value, the uniformity and integrity of the oxide film will have a certain impact. Especially for aluminum-copper alloys and aluminum-silicon alloys, it is difficult to oxidize hard anodes and it is difficult to ensure quality. When the content of copper in the aluminum-copper alloy is more than 5%, and the content of silicon in the aluminum-silicon alloy is more than 7.3%, it is not suitable for direct anodization to be performed by direct current, but the direct current and alternating current superposition methods are required for the oxidation treatment.
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