Anodising is the process of forming a thick oxide layer of aluminium. This aluminium oxide coat makes it resistant to further corrosion.
What is anodising?
Anodising is a process of electrolytic passivation to increase the natural oxide layer’s thickness on the surface of metal parts. This process converts the metal surface into a decorative, durable, corrosion-resistant, anodic oxide finish.
How anodising is done?
The process is done by immersing the aluminium into an acid electrolyte bath and passing an electric current through the medium. A cathode is mounted inside the anodizing tank; the aluminium acts as an anode so that oxygen ions are released from the electrolyte to combine with the aluminium atoms at the surface of the part anodised.
Uses
- Protect satellites from the harsh environment of space.
- Used in one of the world’s tallest buildings – the Willis Tower in Chicago, Illino
