C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
C25D 11/22 (2006.01)
Patent
CA 2042160
Abstract of the Disclosure A process for producing articles comprising anodized films exhibiting areas of different colour and the articles thus produced. The process comprises anodizing a surface of an article made of or coated with aluminum or an anodizable aluminum alloys to produce an anodic film having a porous outer layer and a non-porous inner barrier layer between the porous layer and the underlying surface of the metal article. A metal is electrodeposited into the pores of the film to form a semi-reflective layer of metal deposits in the film which generates a visible colour by effects including light interference between light reflected from the semi-reflective layer and light reflected from the underlying metal layer. A cathodically biased electrode is brought into contact with or close proximity to limited areas of the film to cause the barrier layer to thicken in those limited areas only. This step in itself may create a pattern of different colours in the contacted and non-contacted areas of the film. However, further anodization of the surface is preferably carried out before, after, or both before and after, the contact with the electrode, at a voltage which causes the film to thicken below the deposits in the non-contacted areas, but not significantly in the contacted areas. The contact with the electrode and additional anodization, if employed, causes the optical path that light travels when reflected from the metal deposits and the underlying metal surface to differ in the contacted and non-contacted areas, thus resulting in the generation of different interference colours in these areas. If desired, the film can be detached from the aluminum article on which it was formed and a very thin layer of metal applied to the exposed surface of the film in order to make a very thin, flexible, planar, patterned article suitable for use as a packaging sheet, or the like.
Alcan International Limited
Jozefowicz Mark Adrian
Kirby Eades Gale Baker
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