Because aluminium readily oxidizes when in contact with the atmosphere forming a thin layer of aluminium oxide over its surface. Polishing the aluminium readily removes this layer of oxidation, exposing the pure metal.
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Because aluminium readily oxidizes when in contact with the atmosphere forming a thin layer of aluminium oxide over its surface. Polishing the aluminium readily removes this layer of oxidation, exposing the pure metal.
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Because on the aluminum there is a thin layer of aluminum oxide and if you need pure aluminum you should take the layer off
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