Lightfastness-improvement of dyeings on aluminium oxide layers

C - Chemistry – Metallurgy – 25 – D

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C25D 11/24 (2006.01)

Patent

CA 2382440

Process for the production of dyed oxide layers on aluminium or aluminium alloys by dyeing in an aqueous dyebath, rinsing with water and sealing, in which the dyeing is carried out using at least one water-soluble anionic dye (A) which possesses at least one substituent and/or component combination with a ligand character that is capable of forming a nickel complex with nickel ions, and the sealing is carried out by cold sealing with at least one sealing agent preparation (B) containing nickel ions Ni2+ and fluoride ions F- and optionally hot secondary sealing with water, especially for achieving dyeings of improved light fastness.

L'invention se rapporte à un procédé de production de couches d'oxyde teintées sur de l'aluminium ou des alliages d'aluminium consistant à teinter dans un bain de teinture, à rincer avec de l'eau et à étanchéifier, l'opération de teinture étant effectuée à l'aide d'au moins une teinture anionique soluble dans l'eau (A) possédant au moins un substituant et/ou une composition de composants à caractère de ligand qui est capable de former un complexe de nickel avec des ions nickel, et l'étanchéification étant effectuée par une opération d'étanchéification à froid avec au moins une préparation à base d'agents d'étanchéification (B) contenant des ions nickel Ni?2+¿ et des ions fluorure F?-¿ et éventuellement par une opération d'étanchéification à chaud avec de l'eau, notamment afin d'obtenir des teintures à résistance améliorée à la lumière.

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