Sulphuric Acid Anodising (Also known as Natural Anodising)
Aluminium alloys are anodised to increase corrosion resistance, to increase surface hardness, and to allow dyeing (colouring), improved lubrication, or improved adhesion for painting or other finishes.
Sulphuric anodising is the most widely used anodising process. Anodising is a process by which the naturally occurring thin oxide layer on the surface is extensively increased by immersing the components in a solution of sulphuric acid and applying an electric current. The subsequent oxide layer can either be sealed in hot water or proprietary cold solutions to produce a clear, electrically resistant coating which is corrosion resistant. It also creates a porous surface that means it can be dyed to with a variety of colours which are aesthetically pleasing. The colour of components can be matched batch to batch, provide the same grade of alloy is used each time. Different alloys will give different shades of colour and some will be duller in appearance than others.
Anodising is used in a wide range of applications for both performance and aesthetic reasons. These include:
Process Specifications Offered:
We currently anodise to BS EN 12373-1 which replaced BS 1615 and Def Stan 03-25
Components up to 1800mm for clear anodising. Up to 900 mm for black Up to 1800 mm for red Other colours are available on request.