Anodising of Aluminium

Anodising is an oxidation process based on electrolyse and acting on the aluminium material. 

The anodic film is built by immersing the aluminium in a batch of sulphuric acid and passing a current of approx. 1-2 A/dm2 at 8-20 volts between the aluminium (anode) and the cathode. This produces a film that is integral with the aluminium and not an applied layer. It hardens the surface, increases its abrasion resistance and improves the metal's corrosion resistance; the anodic film further insulates the aluminium surface and gives the aluminium a decorative, metallic appearance through a wide variety of colours.

Hard anodising is a specific electrolytic process designed to produce hard and thick films on aluminium and its alloys. Other processes, such as anodising combined with preceding gloss treatment, give the aluminium a high lustre and excellent corrosion resistance.

The anodising process offers a wide range of applications.  Anodising has been used in building construction for more than 60 years.  Anodising gives the safest and hardest architectural finish currently available. Anodised aluminium is easy to clean and requires little maintenance.

The Qualanod association has established a set of technical specifications and a quality label recognised internationally in order to give customers a guarantee for high quality anodising in building and architecture.