Method for colouring oxide layers of aluminium or aluminium...

Details Method for colouring oxide layers of aluminium or aluminium... Method for colouring oxide layers of aluminium or aluminium...

C - Chemistry, Metallurgy

25

D

96/269, 204/91.1

C25D 11/14 (2006.01) C25D 11/18 (2006.01) C25D 11/24 (2006.01) G03C 1/54 (2006.01) G03C 1/77 (2006.01)

Patent

CA 1190508

ABSTRACT OF THE DISCLOSURE Oxide layers of aluminium or aluminium alloys are coloured with organic compounds by introducing at least one diazo compound into pores of the oxide layer and reacting the diazo compound to form a dye. Patterns, designs, labels, signs or pictures can, for example, be produced by irradiat- ing the diazo compounds incorporated in the oxide layer. The articles thus produced may be used as sign-boards, front plates, scales, circuit diagrams, traffic signs, identity cards, etc.

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