Process for electrodepositing composite nickel layers

Details Process for electrodepositing composite nickel layers Process for electrodepositing composite nickel layers

1984-04-20

1985-10-29

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

204 49, C25D 514

Patent

active

045499420

ABSTRACT:
An improved process for producing a composite nickel-containing electroplate on a substrate including an inner nickel-containing layer, of an average sulfur content of less than about 0.03 percent by weight, an intermediate nickel-containing layer of an average sulfur content of about 0.05 to about 0.5 percent by weight and an adjacent adherent outer nickel layer of an average sulfur content of about 0.02 to about 0.15 percent but less in sulfur than the intermediate layer and higher in sulfur than the inner layer. The controlled amount of sulfur is introduced into at least the intermediate layer by employing an aqueous acidic nickel solution containing a controlled amount of a thiazole and/or thiazoline additive compound so as to provide an intermediate nickel-containing deposit containing the specified average sulfur content.

REFERENCES:
patent: 2837472 (1958-06-01), Gundel et al.
patent: 2849351 (1958-08-01), Gundel et al.
patent: 2892760 (1959-06-01), Gundel et al.
patent: 3090733 (1963-05-01), Brown
patent: 3703448 (1972-11-01), Clauss et al.
patent: 4384929 (1983-05-01), Tremmel et al.

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