Aqueous alkaline zincate solutions and methods

C - Chemistry – Metallurgy – 25 – D

Patent

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C25D 3/22 (2006.01) C23C 18/16 (2006.01) C23C 18/52 (2006.01) C25D 5/14 (2006.01)

Patent

CA 2502672

The present invention provides an improved aqueous alkaline zincate solution comprising hydroxide ions, zinc ions, nickel ions and/or cobalt iron ions, copper ions, and at least one inhibitor containing one or more nitrogen atoms, sulfur atoms, or both nitrogen and sulfur atoms provided said nitrogen atoms are not present in an aliphatic amine or hydroxylamine. The present invention also relates to methods for depositing zincate coatings on aluminum and aluminum alloys comprising applying an immersion zincate coating on an aluminum or aluminum alloy substrates, optionally followed by plating the zincate coated aluminum or aluminum alloy substrate using an electroless or electrolytic metal plating solution.

La présente invention porte sur une solution aqueuse améliorée de zincate d'alcali comprenant des ions d'hydroxyde, des ions de zinc, des ions de nickel et/ou des ions de fer de cobalt, des ions de cuivre et au moins un inhibiteur contenant un ou plusieurs atomes d'azote, de atome de soufre ou, à la fois, des atomes d'azote et de soufre, ces atomes d'azote n'étant pas présents dans un amine aliphatique ou un hydroxylamine. La présente invention porte également sur des procédés visant à appliquer des revêtements de zincate sur de l'aluminium et des alliage d'aluminium et consistant à appliquer un revêtement de zincate en immersion sur des substrats d'aluminium ou d'alliage d'aluminium, puis éventuellement à effectuer un placage sur le substrat d'aluminium ou d'alliage d'aluminium recouvert de zincate au moyen d'une solution de placage électrolytique ou non électrolytique.

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