1. What is anodising?
Anodising is an electrochemical process that thickens the natural oxide layer on metals, improving the resistance to rust and surface finish of the metal. The metal is then submerged in an acid electrolyte bath and an electrical current is passed through it, so oxygen ions can bond with the metal surface.
2. What is the purpose of anodising?
The main purpose of anodising is to improve the surface properties of the metal, such as resistance to rust, wear resistance, and surface hardness. It also can improve the appearance by allowing dye to be absorbed into the porous oxide layer.
3. Is anodising environmentally friendly?
The process of anodising, like poeton.co.uk/surface-treatments/anodising, is generally considered more environmentally friendly than many coating processes because it does not use heavy metals or solvent-based paints. However, it does generate acidic wastewater that must be treated and neutralised before being disposed of.
4. What substrates or base metals can be anodised?
5. What is the difference between Type II “conventional anodise” and Type III “hard anodise”?
Type II anodising produces a thinner oxide layer, typically used for decorative finishes and light resistance to corrosion. Type III anodising, known as hard anodising, produces a much thicker and denser oxide layer.
6. Is there a price difference between conventional and hard anodising?
Yes, hard anodising is more expensive because of its longer processing times and higher energy requirements, whereas conventional anodising is generally more cost-effective.