Anodizing in surface industry

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  • Anodizing flowsheet


a) Example of decorative anodizing options


Anodizing flowsheet1.jpg

Literature: BAT for the Surface Treatment of Metals and Plastics, May 2005


b) Typical anodozing plant layout


Anodizing flowsheet2.jpg

Literature: BAT for the Surface Treatment of Metals and Plastics, May 2005


  • Typical parameters of the process
Process Temperature [°C] Heat transfer medium Residence time Chemicals Concentration Details Literature
Chromic acid anodizing of aluminium(decorative) 20 10-15 min Sulphutic acids 180-200 g/l BAT for the surface treatment of metals and plastics, August 2006
Special electrolytes Sulphuric acid: 150 g/l; oxalic acid: 30 g/l
Hard anodizing <5 Sulphuric acid
Sulphuric acid, oxalic acid
Chromic acid anodizing of aluminium 38-42 Chromic acid 30-100 g/l


  • Energy losses from the surface area of heated process solutions


Energy losses from the surface area of heated process solutions.jpg

LITERATURE: BAT for the Surface Treatment of Metals and Plastics, May 2005


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