Anodised surface finish

Anodising is an electrochemical process, in which the anodised aluminium substrate (for example, mill-finish profiles) is immersed in an aqueous, acidity-regulated electrolyte solution. On the aluminium contact surface - electrolyte solution produces an electrochemical reaction that ultimately leads to the formation of a defined aluminium oxide barrier layer.
The DC sulphuric acid process is the most commonly used anodising process for architectural applications. During the process, the pore structure of the aluminium oxide layer formed must be closed (“sealed”). This results in a colourless, transparent oxide film, which protects the long-term appearance of the metal. As a result of mechanical preparation of the surfaces for E1 to E5 (see pretreatment), the appearance and long-term value of the aluminium surface is significantly increased and then protected in the long term by the anodising process. By including metal compounds in the pores before sealing, the normally colourless oxide layer can be coloured (light, pale, medium or dark bronze, and black). In the SANDALOR process, the use of organic pigments can extend the range of colours available to include shades of yellow, brown, red and blue.

Video Anodising