Method for treating the surfaces of aluminium or aluminium...

C - Chemistry – Metallurgy – 25 – D

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C25D 11/10 (2006.01)

Patent

CA 2415556

The invention relates to a method for treating the surfaces of aluminium or aluminium alloys by anodically oxidising the aluminium or aluminium alloys in an electrolyte, the electrolyte containing 3 to 30 wt. % of an alkane sulfonic acid. The invention also relates to the use of aluminium or aluminium alloy workpieces produced according to said method, in the building trade, in car or aeroplane construction and in packaging. The invention further relates to an electrolyte composition for the anodic oxidation of aluminium or aluminium alloys, wherein the electrolyte contains 3 to 30 wt. % of an alkane sulfonic acid, as well as the use of an alkane sulfonic acid in a method for the anodic oxidation of aluminium or aluminium alloys in order to increase the speed of the anodic oxidation and to reduce the required energy consumption for the process.

La présente invention concerne un procédé de traitement de surfaces de pièces en aluminium ou en alliages d'aluminium par oxydation anodique de l'aluminium ou des alliages d'aluminium (anodisation) dans un électrolyte, l'électrolyte contenant 3 à 30 % en poids d'un acide alcanesulfonique, et l'utilisation de pièces en aluminium ou en alliages d'aluminium fabriquées selon ledit procédé dans le bâtiment, l'industrie automobile et l'industrie aéronautique. La présente invention concerne également une composition électrolytique pour l'oxydation anodique d'aluminium ou d'alliages d'aluminium, l'électrolyte contenant 3 à 30 % en poids d'un acide alcanesulfonique, ainsi que l'utilisation d'un acide alcanesulfonique dans un procédé d'oxydation anodique d'aluminium ou d'alliages d'aluminium (anodisation) pour augmenter la vitesse de l'oxydation anodique et réduire la consommation d'énergie nécessaire à cette oxydation.

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