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Hard Anodising

This process is used to produce a thicker aluminium oxide compared to the standard sulphuric acid process, resulting in an extra durable surface layer with increased wear resistance.

We are able to anodise a variety of aluminium alloys at controlled thicknesses, including specialist high copper.

The micron thickness range for this finish is 25 to 100 microns (depending on the alloy used).

Available in clear and a variety of colours: black, red, orange, yellow, green, blue, purple, pink and gold.

This finish appears duller than sulphuric anodising. 

Nickel acetate seal, demineralised hot water seal and PTFE seal (providing the lowest coefficient of friction of any solid) are available.

We are able to anodise to the dimensions of: 2.1m x 0.8m x 0.9m. ​


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Treatment Tank Dimensions


Hard anodising is very similar to sulphuric anodising - it is the electrochemical process of producing a layer of aluminium oxide onto the surface of aluminium. However, a thicker oxide layer is produced, therefore producing a hard wearing finish with high electrical insulation properties. The hard anodising process, including passivation, is entirely chromium VI free and so meets the requirements of the latest legislation. 

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