Method for obtaining bright zinc and cadmium electroplates using carboxamide additives
AssigneeThe Metalux Corporation
InventorsReuven Merker, Salvatore Lucca
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Abstract
The addition of an inner salt of a quaternized pyridine carboxamide, preferably 1-benzyl pyridinium-3-carboxamide to aqueous alkaline electroplating baths containing zinc and cadmium ions results in smooth, bright deposits of these metals. High plating efficiency with low consumption of the additive compound is obtained using it either alone or in combination with small amounts of nicotinamide.
Claims15
In an aqueous alkaline electroplating bath containing metal ions selected from the group consisting of zinc and cadmium, the improvement which comprises having present in the bath from about 0.01 grams per liter to saturation of an inner salt of a quaternized pyridine carboxamide having the formula ##STR6## wherein R is hydrogen or a nicotinamide radical, said carboxamide being dissolved in the bath to yield a metal deposit of improved brightness.
In the process for electrodepositing a metal from an aqueous alkaline electroplating bath containing metal ions selected from the group consisting of zinc and cadmium, the improvement which comprises adding to said bath from about 0.1 to about 10 grams per liter of an inner salt of a quaternized pyridine carboxamide having the formula ##STR7## wherein R is hydrogen or a nicotinamide radical, said carboxamide being dissolved in the bath to yield a metal deposit of improved brightness.
An aqueous addition agent for an electroplating bath containing metal ions selected from the group consisting of zinc and cadmium, said agent consisting essentially of an aqueous solution consisting essentially of (a) from about 1:100 to 100:1 parts by weight of an inner salt of a quaternized pyridine carboxamide having the formula:
- ##STR8## wherein R is hydrogen or a nicotinamide radical, and (b) a bath soluble organic polymer, in a ratio of (a):
- (b), in parts by weight, of from about 1:100 to about 100:1.
Dependencies are inferred from the claim text.