C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/21.5, 204/24
C25D 11/14 (2006.01) C25D 11/12 (2006.01) C25D 11/22 (2006.01)
Patent
CA 1072908
ABSTRACT Anodised aluminium having an anodic oxide film of at least 3 microns thickness is coloured by electrolytically depositing inorganic pigment from metallic salt solutions, particularly nickel, cobalt, tin and copper salts and mixtures. The pigment deposits are characterised by outer ends of an average size in excess of 260 .ANG. lying at a distance of 500 - 3000 .ANG. from the aluminium/aluminium oxide interface. In a preferred method of production the anodic oxide coating is formed under conventional anodising conditions in a sulphuric acid-based electrolyte. The anodised aluminium is then treated in phosphoric acid at a voltage of 8 - 50 volts to enlarge the pores to above 260 .ANG. in a region at the base of the pores adjacent the barrier layer. The pigment is then deposited in the pores to the specified depth and interesting new colour shades are obtained as a result of optical interference due to the presence of the large size shallow inorganic pigment deposits.
256764
Cheetham Graham
Sheasby Peter G.
LandOfFree
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