Composition and process for treating the surface of...

C - Chemistry – Metallurgy – 23 – C

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C23C 22/38 (2006.01) C23C 22/36 (2006.01) C23C 22/40 (2006.01) C23C 22/44 (2006.01)

Patent

CA 2225757

A highly corrosion resistant and paint adherent surface coating on aluminiferous metals can be provided very rapidly, if desired in less than one second, by contacting the surface with an aqueous acid liquid treating composition containing as solutes specified proportions of phosphate ions, titanium containing materials, fluoride, and an accelerator; the accelerator is preferably at least one of nitrous acid, nitric acid, tungstic acid, molybdic acid, permanganic acid, water soluble salts of all of these acids, and water-soluble organoperoxides.

Un revêtement de surface hautement résistant à la corrosion et adhérent à la peinture pour métaux alumineux peut être obtenue très rapidement, si désiré en moins d'une seconde, par mise en contact de la surface avec une composition traitante liquide, acide, aqueuse contenant comme solutés des proportions spécifiques d'ions phosphate, de matériaux contenant du titane, de fluorure et d'un accélérateur. De préférence, l'accélérateur est au moins une des substances suivantes: acide nitreux, acide nitrique, acide tungstique, acide molybdique, acide permanganique, les sels solubles dans l'eau de tous ces acides, et des organoperoxydes solubles dans l'eau.

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