Method for electrolytic coloring of aluminum material

C - Chemistry – Metallurgy – 25 – D

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C25D 11/22 (2006.01)

Patent

CA 2377953

In a method for electrolytic coloring of an aluminum material which comprises immersing an aluminum material, which comprises aluminum or an aluminum alloy, having an anodized film in an electrolytic coloring treatment bath containing a soluble metal salt and passing a direct current waveform by the use of the aluminum material as an anode, to thereby subjecting the aluminum material to a pre-treatment prior to coloring, and then subjecting the aluminum material to an a.c. electrolytic coloring treatment in the same electrolytic coloring treatment bath, an improvement which comprises performing the above pre- treatment prior to coloring until a voltage and a current reach respective predetermined values. The improved method can be employed for significantly reducing coloring irregularities not only within one energizing lot, but also between different energizing lots, and thus for producing an aluminum material being colored in a uniform tone with stability and ease on an industrial scale.

L'invention porte sur un procédé de coloration électrolytique d'un matériau en aluminium, procédé consistant à immerger ce matériau comprenant de l'aluminium ou un alliage d'aluminium, former un film anodisé dans un bain de traitement de coloration électrolytique contenant un sel métallique soluble et faire passer une forme d'onde de courant continu à l'aide du matériau en aluminium sous forme d'anode, puis soumettre ce matériau en aluminium à un prétraitement avant l'étape de coloration, et ensuite à un traitement de coloration électrolytique à courant alternatif dans le même bain de traitement. L'amélioration apportée à ce procédé consiste à effectuer le prétraitement précité avant la coloration jusqu'à ce que la tension et le courant atteignent des valeurs prédéterminées respectives. Le procédé amélioré peut être utilisé pour réduire considérablement les irrégularités de coloration non seulement dans un lot d'excitation, mais également entre différents lots d'excitation, et cela pour produire un matériau en aluminium de coloration uniforme, stable et facile à produire à l'échelle industrielle.

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