Nickel-zinc phosphate conversion coatings

Details Nickel-zinc phosphate conversion coatings Nickel-zinc phosphate conversion coatings

C - Chemistry, Metallurgy

23

C

C23C 22/12 (2006.01) C23C 22/36 (2006.01)

Patent

CA 2304689

A method of applying a phosphate conversion coating to a metal surface, including the steps of: (a) providing an aqueous, acidic treatment solution comprising: phosphate ions; zinc cations; and nickel (II) cations; wherein the treatment solution has between about 2.1 and about 6.0 points of free acid; and (b) contacting the metal surface with the treatment solution for a time and at a temperature sufficient to form a phosphate conversion coating on the metal surface. A metal object coated in this manner is also provided, and the gram-atom percent of nickel to the total amount of nickel and zinc in the coating is between about 10 and about 13.

L'invention concerne un procédé permettant d'appliquer un revêtement sur une surface métallique, par conversion à base de phosphate. Ce procédé consiste a) à produire une solution aqueuse de traitement acide contenant des ions de phosphate, des cations de zinc, et des cations de nickel (II), ladite solution possédant entre environ 2,1 et 6,0 points d'acide libre; et b) à mettre en contact ladite surface métallique avec la solution de traitement pendant une durée et à une température suffisantes pour former un revêtement de conversion à base de phosphate sur la surface métallique. L'invention concerne également un objet métallique recouvert à l'aide de ce procédé, le pourcentage grammes/atomes de nickel par rapport à la quantité totale de nickel et de zinc contenue dans le revêtement étant environ entre 10 et 13.

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