Sulphuric Anodise (Anodize)
Anodic oxidation is very widely used for the treatment of aluminium and aluminium alloys. Anodising provides an attractive decorative and protective finish for a wide variety of aluminium components, In the anodising process a thin invisible film of aluminium oxide forms naturally on the surface and provides some degree of corrosion protection for the underlying aluminium. Depending upon the initial surface condition, and alloy composition, a bright, semi-bright or matt effect will be obtained. This is known as clear, natural or silver anodising. This anodic film may also be dyed to give a wide range of attractive colour finishes, i.e. Gold, Gold Orange, Red, Blue, Green or Black. Because the various dyes are absorbed into the pore structure, the sealed, coloured anodised aluminium is extremely resistant to wear and fading in the sunlight.


Sulphuric Hard Anodise (Anodize)
Although the normal anodic oxidation process is fairly hard, and wear resistant, by subtle adjustment of the anodising conditions, harder and thicker films can be produced for engineering applications. Most Hard Anodising is self-coloured, dependent upon the alloy being used, but can be supplied in a variety of colours. The major applications for Hard Anodising are for aircraft and general engineering uses. The high resistivity of the hard anodic film means that electrical components can be effectively insulated.