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<p>with atmospheric oxygen, and a thin <a href="page.php?w=Passivation_%28chemistry%29">passivation layer</a> of aluminium oxide (~5&nbsp;nm thickness) forms on any exposed aluminium surface almost instantly. This layer protects the metal from further oxidation. The thickness and properties of this oxide layer can be enhanced using a process called <a href="page.php?w=anodising">anodising</a>. A number of <a href="page.php?w=alloys">alloys</a>, such as <a href="page.php?w=aluminium_bronze">aluminium bronze</a>s, exploit this property by including</p><p>
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