Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Depositing predominantly single metal coating
Patent
1994-10-31
1997-03-04
Tung, T.
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Depositing predominantly single metal coating
205291, 205295, C25D 338
Patent
active
056075707
ABSTRACT:
The improved aqueous, non-cyanide zinc electroplating solution prevents iron contamination during electroplating. The solution, in addition to water, has a copper salt, preferably copper sulfate, in a concentration of about 0.01-6% by weight of the solution, and the water-soluble reaction product of epichlorohydrin with Compound A, preferably in a concentration of about 16.67-26.67 gm./liter of solution. Compound A is a nitrogen-containing compound selected from aliphatic amine, unsubstituted heterocyclic nitrogen compound having at least two reactive nitrogen sites, and substituted heterocyclic nitrogen compound having at least two reactive nitrogen sites and 1-2 substitution groups selected from methyl, ethyl and amino groups. The reaction product, providing it includes the substituted or unsubstituted heterocyclic nitrogen compound, before use in the solution may be further reacted with a reagent of at least one of ammonia, aliphatic amine, polyamine or polyimine. A preferred reaction product is that of imidazole and epichlorohydrin in a molar ratio of about 0.7-1.7:1.
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Posta Jr. John J.
Tung T.
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