Alkaline bright zinc plating and additive composition therefore
AssigneeThe Richardson Company
InventorsFrederick W. Eppensteiner, Phillip J. DeChristopher
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Abstract
An alkaline, electroplating bath for bright zinc plating containing a composition comprising a condensate of a heterocyclic compound and an epihalohydrin, for example a condensate of nicotinamide and epichlorohydrin or a corresponding quaternary salt of such condensate, which bath is capable of producing bright, fine grained zinc deposits over a broad current density range both in the presence and absence of cyanides.
Claims28
A bright zinc, electroplating bath comprising an aqueous alkaline solution containing a source of zinc ions and from about 0.001 to about 1.0 grams per liter of a composition selected from the group consisting of a condensate of a heterocyclic compound and an epihalohydrin and the quaternary salt of such condensate wherein the mol ratio of heterocyclic compound to epihalohydrin ranges from about 2:1 to 1:2, said condensate having a molecular weight of from about 400 to 9000, said heterocyclic compound being a pyridine substituted in the 3 or 4 position with a radical selected from the group consisting of carbamoyl and acylhydrazino.
Dependencies are inferred from the claim text.