Aqueous acidic immersion plating solutions and methods for...

C - Chemistry – Metallurgy – 25 – D

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C25D 5/44 (2006.01) C23C 18/18 (2006.01) C23C 18/31 (2006.01)

Patent

CA 2530286

The present invention provides a non-cyanide aqueous acidic immersion plating solution having a pH of from about 3.5 to about 6.5 and comprising zinc ions, nickel ions and/or cobalt iron ions, and fluoride ions. In one embodiment the immersion plating solutions of the invention also contain at least one inhibitor containing one or more nitrogen atoms, sulfur atoms, or both nitrogen and sulfur atoms. The present invention also relates to methods for depositing zinc alloy protective coatings on aluminum and aluminum alloy substrates comprising immersing the aluminum or aluminum alloy substrate in the non-cyanide acidic immersion plating solutions of the invention. Optionally, the zinc alloy coated aluminum or aluminum alloy substrate is plated using an electroless or electrolytic metal plating solution.

L'invention concerne une solution aqueuse acide sans cyanure de dépôt par immersion qui a un pH compris entre environ 3,5 et environ 6,5 et qui comprend des ions zinc, des ions nickel et/ou des ions cobalt, ainsi que des ions fluorure. Selon un mode de réalisation de l'invention, les solutions de dépôt par immersion contiennent également au moins un inhibiteur contenant un ou plusieurs atomes d'azote, atomes de soufre ou atomes d'azote et de soufre. L'invention concerne également des procédés servant à déposer des revêtements protecteurs d'alliage de zinc sur des substrats d'aluminium et d'alliage d'aluminium et consistant à immerger le substrat d'aluminium ou d'alliage d'aluminium dans les solutions acides sans cyanure de dépôt par immersion selon l'invention. On peut facultativement procéder à un dépôt électrolytique sur le substrat d'aluminium ou d'alliage d'aluminium revêtu d'alliage de zinc au moyen d'une solution de dépôt métallique autocatalytique ou électrolytique.

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