Anodising, also known as anodic oxidation, is an electrochemical process designed mainly to protect metals and materials such as aluminium. It is a very important process, used both in the home and in industry.
Anodising applies a very thin protective layer to the workpiece, protecting it without altering its shape or structure.
How anodising of metals works
Anodic oxidation creates an electrochemical process on the metal, causing a reaction between the metal and oxygen that forms a film of aluminium oxide on its surface.
Anodising can be clear or coloured, depending on requirements. The effect on the material is so attractive that many companies request it specifically to improve the appearance of their parts. It therefore has a dual role: protecting materials from wear over time while making them attractive.
The stages of anodising
The anodising process takes place in three stages: chemical-mechanical pre-treatment, the actual anodising or anodic oxidation, and finishing.
During pre-treatment, the metal undergoes various processes according to specific needs, such as degreasing, satin finishing or polishing. During anodising itself, the metal undergoes the electrochemical process that forms the protective aluminium oxide film. Finally, during finishing, the metal is sealed and oiled, and any residual fixing dust is removed.