Anodising

 

Anodising is an electrolitic passivation process which form san oxide layer on the aluminium surface under controlled conditions. The anodic film grows with 2/3 of its thickness below the original metal surface and 1/3 above it. It is considerably thicker than natural oxide layer, due to which it effectively protects the aluminium surface from further oxidation, that is corrosion.

Aluminium oxide is a hard, durable, weather resistant substance that protects the base metal. The coating is integral to the metal and cannot peel off or flake. Anodising gives aluminium a deeper, richer metallic appearance than possible with organic coatings.


 

Which aluminium alloys and what to avoid:

 

  • Choose the aluminium alloys dedicated to decorative, architectural anodizing
  • It should have from the producer the certificate for anodisnig if it is possible
  • Preferred aluminium alloys:6060,6061,6063 for extruded material, 5005A, 5754 for aluminium sheets.
  • Surface of the material should be plain, avoid scratches, cracks, stains, oil stains etc.