Zinc-nickel alloy electroplating system

a zinc-nickel alloy and electroplating technology, applied in the field of electroplating compositions, can solve the problems of environmental unfavorable plating process, reducing plating efficiency and plating rate, and maintaining a functional level of metal ions in the bath

a zinc-nickel alloy and electroplating technology, applied in the field of electroplating compositions, can solve the problems of environmental unfavorable plating process, reducing plating efficiency and plating rate, and maintaining a functional level of metal ions in the bath

US20060283715A1Inactive Publication Date: 2006-12-21PAVCO INC
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[0086] Various zinc-nickel alloy electroplating compositions were evaluated to determine the effect of various organic compositions in combination with a standard electrolyte composition according to the invention to deposit a zinc-nickel alloy layer on a substrate. The various compositions were evaluated in terms of the physical appearance of the zinc-nickel alloy layer deposited on the substrate and the average concentration of nickel in the deposited layer when the deposition is performed at various specific current densities.

[0087] Electroplating was conducted in a standard thermostat-controlled 267 ml Hull cell with zinc and nickel anodes. The zinc anodes were pretreated in a solution for 24 hours prior to use, the solution containing 55 g / L nickel chloride and 255 g / L ammonium chloride. The pretreatment step is useful in that the zinc anodes will spontaneously form a nickel coating in the plating bath. Pre-forming the coating prior to use of the anode in the electroplating ba...

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Abstract

The invention provides an aqueous zinc-nickel alloy electroplating composition particularly useful in an electroplating method for depositing a zinc-nickel alloy layer on a substrate, wherein the deposited layer exhibits uniform nickel concentration and good aesthetics across a broad range of current densities. The electroplating composition comprises an electrolyte composition and an organic composition. In one embodiment, the electrolyte composition comprises a zinc ion source, a nickel ion source, a pH buffering agent and at least one additional salt, and the organic composition comprises a Class I nickel brightener, a Class II nickel brightener, an aromatic carboxylic acid, an aldehyde or ketone compound, and a non-ionic or anionic surfactant. The electroplating composition is particularly free of chelators and free ammonium-producing agents.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit of U.S. Provisional Application No. 60 / 692,204, filed Jun. 20, 2005, which is incorporated herein in its entirety.FIELD OF THE INVENTION [0002] The present invention is directed to electroplating compositions, and more particularly to compositions useful for electroplating zinc-nickel alloys. The invention is specifically directed to an electroplating composition comprising an electrolyte composition and an organic composition, wherein the electroplating composition is particularly beneficial for depositing zinc-nickel alloys with a consistent nickel concentration across a broad range of current densities. BACKGROUND [0003] Electrodeposition of zinc and nickel metal onto a substrate, particularly a metal substrate, and very particularly a ferrous substrate, is a common practice for imparting protective and decorative properties to the substrate. For example, ferrous articles are often zinc or nickel e...

Claims

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Application Information

Patent Timeline
21 Dec 2006
Publication
US20060283715A1
IPC
C25D3/56
CPC
C25D3/565; C25D3/562
Inventors
DIADDARIO, LEONARD L. JR.; STORER, GREGORY E.