anodised

Anodised refers to a process known as anodising, which is an electrolytic passivation method used to increase the thickness of the natural oxide layer on the surface of a metal. The most common metal treated this way is aluminium. Anodising is an electrochemical process that converts the metal surface into a durable, corrosion-resistant, and aesthetically pleasing decorative finish. The process typically involves immersing the metal part in an electrolyte bath and applying an electric current, with the metal acting as the anode.

The resulting oxide layer is typically harder than the base metal and can be porous, which allows for subsequent dyeing or sealing. This porosity is often exploited to impart colour to anodised aluminium. The colour is achieved by introducing dyes into the pores of the oxide layer, which are then sealed. Common colours include black, gold, bronze, and various shades of blue and red. The thickness and properties of the anodised layer can be controlled by adjusting the parameters of the electrochemical process, such as current density, voltage, temperature, and electrolyte composition.

Anodised finishes are widely used in various industries due to their desirable properties. They are found in architectural applications like window frames and building facades, in consumer electronics such as mobile phones and laptops, and in automotive components. The increased corrosion resistance makes anodised metals suitable for outdoor use, while the hardness provides wear resistance. The ability to colour the surface offers significant design flexibility.