Normal anodising, better known as technical anodising, is developed to improve aluminium and aluminium components both functionally and decoratively. This layer is formed by anodic oxidation in a cooled acid electrolyte of special composition. With the help of an electric direct current, the base material is transformed into an aluminium oxide layer on the surface.
The layer thickness to be achieved depends on the application, the desired layer properties and other parameters. For most applications layer thicknesses of 5 – 20 µm can be achieved. Only 1/3 of the oxide layer is built up, the rest penetrates the aluminium. This must be considered during the design phase.
Alloy determines the colour with technical anodising
Practically all technically interesting aluminium alloys for kneading, casting and spraying can be anodised. However, the alloy is a determining factor when it comes to the colour of the anodised part. An alloy from the 3000 series turns grey and a 7000 alloy turns gold. Available colours are clear and black. Other colours are available on request depending on the parameters. Our engineers at Mifa Surface Treatment will be happy to advise you about the colour for technical anodising and other aspects.