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US 4,072,582 AGranted
Aqueous acid plating bath and additives for producing bright electrodeposits of tin
AssigneeColumbia Chemical Corporation
InventorWilliam E. Rosenberg
Life of this patent
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Abstract
An aqueous acid tin electroplating bath contains as a brightening agent certain dialkoxy benzaldehydes, an emulsifying agent, as well as alpha, beta unsaturated carboxylic acids, amides, and esters to give extremely bright electrodeposits.
Claims28
A primary tin electroplating brightener additive, comprising;
- a dialkoxy benzaldehyde having the general formula:
- ##STR4## where R.sub.1 and R.sub.2 are methyl, ethyl, propyl or isopropyl, and where one alkoxy group is ortho and the other alkoxy group is meta to the carbonyl group or where both alkoxy groups are meta to the carbonyl group, and
- from about 1 to about 97 percent by weight of at least one compound selected from the class consisting of alpha, beta unsaturated carboxylic acids, amides, and esters for producing bright electrodeposits of tin from an aqueous acid plating bath.
An aqueous acid electroplating bath containing stannous ions and sulfuric acid for producing bright electrodeposits of tin, comprising;
- from about 0.005 to about 0.2 grams/liter of a dialkoxy benzaldehyde brightener dissolved in the bath,
- said brightener having the general formula:
- ##STR5## where R.sub.1 and R.sub.2 is methyl, ethyl, propyl, or isopropyl, and where one alkoxy group is ortho and the other alkoxy group is meta to the carbonyl group or where both alkoxy groups are meta to the carbonyl group.
Dependencies are inferred from the claim text.