The Premier Plating Company (North East) Ltd company logo Hard Anodising


The sulphuric and hard anodising processes offer limited electrical resistance. The vast majority of anodising is performed in solutions comprising of either sulphuric or chromic acid. Many components require different applications of anodising for different purposes. With all types of anodising, it is essential to ensure that the correct grade of aluminium is used when manufacturing components. A high content of foreign elements will render the anodising process extremely difficult or even impossible, and may cause severe damage to the aluminium. At Premier, we offer two varieties of anodising which are detailed below.

Also referred to as decorative, natural, clear or satin anodising, this finish offers very good corrosion protection without drastically altering the colouring of the aluminium. However, if required, this variety of anodising allows components to be dyed in a variety of colours. The most popular are black, red, blue, gold and bronze, although other colours are also available. Typical finish thicknesses are up to 25 microns.

Sulphuric anodising

Given its full name - anodic oxidisation of aluminium - anodising is a process which produces protective and decorative films on the surface of components constructed from aluminium.

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Similar in many aspects to the sulphuric process above, but with adjustment to the processing conditions, the hard anodising finish offers excellent protection to aluminium parts which, during their working life, will be subject to mechanical or harsh environmental conditions, typically in offshore industries. This process offers good mechanical strength, combined with exceptional wear resistance, when applied. Unfortunately, due to the finer cell structure of this finish, for decorative purposes this deposit is of a dark grey appearance, therefore severely limiting the choice of post-anodising colouring. However, the hard anodised finish can be complemented by post treatment sealing in black or olive colouring using potassium dichromate and nickel acetate solutions. Typical finish thicknesses are in the range of 25-60 microns.

Hard anodising

Example of anodising Anodised unit Anodised parts Sulphuric-anodysing