Aluminium oxide

2O3, hard oxide occurring in various modifications; of these, corundum has the greatest hardness. In contact with atmospheric oxygen, a thin transparent Al2O3 coat is formed spontaneously on aluminium surfaces which protects the aluminium from further oxidation. Anodising artificially reinforces this oxide coat and thus its protective effect. Al2O3 surfaces can be etched in the plasma by means of Ar bombardment or halogenated gases.

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