Faster two-step sealing of anodized aluminum surfaces

C - Chemistry – Metallurgy – 25 – D

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C25D 11/18 (2006.01) C25D 11/24 (2006.01)

Patent

CA 2300859

Anodized aluminum surfaces are advantageously sealed by an energy- and time- saving two step process, in which the first step is contact at not more than 75 ~C with a solution containing lithium and fluoride ions and, optionaly, surfactant. The second necessary step is treatment with hot water or steam, which may be completed in considerably less time than when only hot water or steam is used for sealing. Conventional smut inhibitors and/or neutral buffers as used in hot water for single step sealing may advantageously be included in the second step of this process. 100 - 1000 ppm concentrations of nickel and/or cobalt ions in the treatment liquid for the second treatment step, if environmentally tolerable, make it possible to complete this step in as little as 10 minutes at a temperature as low as 88 ~C.

Il est possible d'obtenir un bouchage plus rapide des pores de surfaces d'aluminium anodisées par un processus en deux étapes. La première consiste à les mettre en contact à moins de 75 ·C avec une solution contenant des ions lithium et fluorure, et facultativement un tensio-actif. La deuxième étape nécessaire consiste à les traiter à l'eau chaude ou à la vapeur, ce qui requiert considérablement moins de temps qu'en n'utilisant l'eau chaude ou la vapeur seules. On aura avantage à ajouter à la deuxième étape les inhibiteurs d'encrassage et/ou les tampons neutres classiques déjà utilisés dans le processus en une étape. De plus l'adjonction au liquide de traitement de la deuxième étape d'ions nickel et/ou cobalt à une concentration de 100 à 1000 ppm, si elle peut être tolérée par l'environnement, permet de clore cette deuxième étape en aussi peu que 10 minutes à une température aussi basse que 88 ·C.

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