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Passivation of aluminium and its alloys

Aluminium will form a layer of aluminium oxide onto its surfaces naturally in the atmosphere if left unprotected. The anodising process will suffice in eliminating this problem, but still may not be suitable for customer requirements. This is because whereas anodising deposits a thick layer of protective electrically resistant oxide onto components, the following passivation processes do not. Both Alocrom 1200 and Iridite NCP processes offer excellent protection and are ideal foundations for paint/powder coating. They also provide superb corrosion resistance and electrical conductivity.


Because these processes do not require electrolysis, it is more practical for larger components to be protected by these methods where anodising would prove impractical.

Whilst stainless steel offers excellent corrosion resistance in itself, it is still not totally immune to corrosion.  Often during a customer's machining processes, tiny amounts of contaminant materials are embedded into the surfaces of the finished stainless steel components. This chemical process restores the protective qualities of the stainless steel by ensuring the removal of residues of metal particle and oxide contamination.

Passivation of stainless steel

Alocrom 1200

This immersion process forms an excellent golden coloured chromate coating onto the surfaces of components made from aluminium and its alloys.

To discuss your requirements, call us today on

01661 831 415

Examples of Passivation Alocrom-1200

Iridite NCP

The new, environmentally-friendly Iridite NCP process applies a clear/very light blue coloured chrome-free coating onto the surfaces of components made from aluminium and its alloys.