Aluminium article with porous anodic oxide film coloured by...

Details Aluminium article with porous anodic oxide film coloured by... Aluminium article with porous anodic oxide film coloured by...

C - Chemistry, Metallurgy

25

D

204/24.6

C25D 11/04 (2006.01) C25D 11/12 (2006.01) C25D 11/22 (2006.01)

Patent

CA 1146114

ABSTRACT The invention provides aluminium articles having porous anodic oxide films coloured by means of an optical interference effect. The articles have porous oxide films at least 3 microns thick, the pores have inorganic pigmen- tary deposits therein having a diameter of at least 26 nm. The articles are made by a process wherein a second oxide film is formed beneath the pigmentary deposits either during, or after, the laying down of the pigmentary deposits. These products show enhanced color clarity and brightness.

319820

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