What is anodising?
An electrochemical process in a bath of diluted sulphuric acid forms an oxide layer. At the surface, the aluminium is converted into aluminium oxide between 5 and 25 microns (one-thousandth of a millimetre). When anodising aluminium, a layer is formed from the aluminium, unlike other surface treatments, where a layer is applied. Anodising has the advantage over a lacquer coating in that it maintains the metal aspect of the aluminium.
Reasons for anodising
Primarily, anodising serves to protect the aluminium against corrosion. What’s more, anodisation makes it possible to enhance the look of the aluminium by adding a pre-treatment and/or colour.