Method of making metal surfaces wettable

C - Chemistry – Metallurgy – 23 – C

Patent

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C23C 22/03 (2006.01) C22F 1/04 (2006.01) C23C 22/84 (2006.01)

Patent

CA 2615276

A method of treating a surface of a metal foil or sheet to make the surface wettable. The method comprises obtaining a metal foil or sheet having an oil- coated surface to be treated, applying a solution of phosphoric acid in a polar, non-aqueous, water-free solvent evenly to the surface at a rate of application in a range of at least 10 mg/ft2, the phosphoric acid being contained in the solution at a concentration such that the phosphoric acid contacts the surface in an amount of 0.5 to 2.0 mg/ft2; and removing the solvent by either drying the surface or heating the foil or sheet at an elevated temperature above ambient to evaporate the oil from the surface to be treated with the proviso that the elevated temperature does not fall in the range between 130 to 240~C. The resulting foil has a wettable surface and can be used, for example, for coating with a layer of another material (e.g. polymer or adhesive) and achieve high peel strength.

L'invention porte sur un procédé de traitement de la surface d'une tôle ou d'une feuille métallique pour la rendre mouillable. Ledit procédé consiste: à se procurer une tôle ou une feuille métallique huilée; à lui appliquer régulièrement une solution d'acide phosphorique dans un solvant polaire, non aqueux, exempt d'eau a raison d'environ au moins 10 mg/ft2, la concentration de l'acide étant telle qu'il se dépose sur la surface à raison de 0,5 à 2,0 mg/ft2; et à retirer le solvant soit par séchage soit par chauffage de la tôle ou de la feuille à une température suffisante pour évaporer l'huile, mais non comprise entre 130 et 240 °C. La feuille résultante présente une surface mouillable et peut être utilisée par exemple pour être revêtue d'un autre matériau (par exemple un polymère ou un adhésif) ainsi très résistant au pelage.

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