Aluminium is a metal with many useful applications, but it has weaknesses. Some of these weaknesses can be mitigated with the anodising process, which enhances its strength and durability whilst creating a more pleasing appearance.
How anodising works
Anodising is when a surface, which is usually aluminium but sometimes another metal, such as titanium, is submerged in an acidic solution known as an electrolyte bath. An electrical charge is passed through it using a cathode, causing a reaction in which oxygen ions attach to the surface and create an oxide layer. The thickness and the quality of the oxide are impacted by the concentration of the acid, the temperature, and the length of time submerged.
The anodised surface will be porous and therefore needs to be sealed for extra protection. Anodising is carried out by specialists such as https://www.poeton.co.uk/surface-treatments/anodising/.
What does anodising do?
The resulting coating after the anodising process is finished will be stronger and more durable than the original surface. There will be no chipping or peeling, and it is more resistant to corrosion. There will also be aesthetic changes; for example, anodising can be used to change the colour of the metal whilst ensuring it remains lustrous, as the anodised surface is porous and can therefore be dyed easily. Anodised aluminium of varying thicknesses is used in everything from aerospace to the military and architecture.
Not every metal is suitable for anodising. There are situations where other forms of surface treatment may be more appropriate, but there is a range of useful applications for anodised aluminium or titanium.
