Method for inhibiting stains on aluminum product surfaces

C - Chemistry – Metallurgy – 23 – C

Patent

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C23C 22/20 (2006.01) B05D 1/18 (2006.01) C23C 22/03 (2006.01) C23C 22/08 (2006.01) C23C 22/68 (2006.01) C23F 11/167 (2006.01)

Patent

CA 2336186

A method for inhibiting the formation of stains, especially water stains, on the exterior surfaces of aluminum alloy products. The method entails contacting the exterior surfaces of these products, particularly sheet or plate products, extrusions and/or forgings made from 5000 or 6000 Series aluminum alloys, with an organophosphonic or organophosphinic acid-derived material. Preferably, liquid forms of this material are added to an alcohol or water-based carrier solution, then sprayed, dipped, painted or rolled onto the surfaces of flat sheet or plate products to enhance their brightness. Other more complex shapes may be dipped into material baths.

L'invention concerne un procédé d'inhibition de la formation de taches, notamment de taches dues à l'eau sur les surfaces extérieures de produits en alliage d'aluminium. Le procédé consiste à mettre en contact les surfaces extérieures de ces produits, notamment des produits en feuilles ou en plaques et des pièces extrudées et/ou forgées formées à partir d'alliages d'aluminium des séries 5000 ou 6000, avec une matière organophosphorique ou dérivée d'un acide organophosphorique. De préférence, les formes liquides de cette matière sont ajoutées à une solution de support à base d'eau ou d'alcool, puis elles sont pulvérisées, trempées, peintes ou roulées sur les surfaces de produits en feuilles plates ou en plaques pour en accentuer l'éclat. D'autres formes plus complexes peuvent être trempées dans des bains de matières.

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