Question

What is anodising?

Answer 1

Anodising is an electrolytic process for producing thick oxide coatings, usually on aluminium and its alloys. The oxide layer is typically 5 to 30µm in thickness and is used to give improved surface resistance to wear and corrosion, or as a decorative layer.

In the electrolytic process, the components to be treated are made an anode in a dilute acid solution. Oxidation occurs at the component surface, resulting in the formation of a coherent oxide film that is very adherent to the underlying metal substrate. The majority of anodising is done on aluminium and its alloys. Other materials which can be anodised include magnesium and titanium alloys.
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