Title: Zinc electroplating baths and process

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Abstract: Aqueous plating baths for the electrodeposition of a zinc coating on a substrate are disclosed and comprise zinc ions to which has been added an amount, effective to provide a level and bright zinc electrodeposit, of a polymeric nitrogen-containing compound prepared by reacting a poly(alkyleneimine) with a cyclic carbonate consisting of carbon, hydrogen and oxygen atoms. More particularly, the poly(alkyleneimine) has a molecular weight within the range of from about 200 to about 100,000, and the cyclic carbonate is one wherein the ring oxygen atoms adjacent to the carbonyl grouping are each bonded to a ring carbon atom, and the ring containing the oxygen and carbon atoms has only three carbon atoms and no carbon-to-carbon unsaturation. The aqueous plating baths of the invention may be acid zinc plating baths or alkaline cyanide or non-cyanide containing plating baths. In addition to the zinc ions and the polymeric nitrogen-containing compound, the zinc plating baths of the invention also may contain other desirable additives such as ethoxylated naphthols and aromatic carbonyl-containing compounds. Methods for the electrodeposition of level zinc deposits from such baths are disclosed.


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