Anodising is an electrochemical process that builds a controlled oxide layer on aluminium. It protects the part against corrosion and allows colouring.
Decorative anodising
5–25 µm thick, natural, black or coloured. Ideal for visible product parts and housings.
Hard anodising
25–60 µm thick and highly wear resistant; used on slides, pistons and rubbing surfaces.
Effect on dimensions
About half of the layer grows outward from the surface. Allow for this on precision fits; surfaces can be masked if needed. Alloy 6061 gives the best anodising results.
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