The process involves immersing the metal in an electrolyte solution, typically sulfuric acid, while applying a direct current. This prompts the flow of electrons from the metal to the electrolyte, and oxygen ions from the electrolyte to the metal. As a result, an oxide layer forms on the surface through a chemical reaction. By adjusting the voltage and duration of the process, the thickness of this layer can be controlled.
The anodised layer is highly durable and exhibits excellent resistance to corrosion and wear. Furthermore, it possesses low electrical conductivity, making it suitable for electrical insulation purposes. The porous structure of the anodised layer allows for dyeing and other decorative treatments, adding to its versatility.
Anodising is a cost-effective and efficient method to enhance both the performance and appearance of metals. Notably, it is an environmentally friendly process that eliminates the need for hazardous chemicals.