Zinc plating baths with condensating polymer brighteners
AssigneeOccidental Chemical Corporation
InventorSylvia Martin
Life of this patent
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Abstract
A zinc plating bath comprises a conductive aqueous solution containing zinc ions and a brightening additive which is a derivative of .beta.-aminopropionic acid or a polymer thereof. A ductile zinc deposit having a uniform high degree of brightness can be electrodeposited from the bath onto a substrate.
Claims16
A zinc electroplating bath comprising a conductive aqueous solution containing zinc ions and a brightening amount of a water soluble brightening additive selected from the group consisting of a monomer of the following general formula and polymers thereof:
- ##STR9## wherein:
- n is from 1 to about 6;
- Y is --OX, --NX.sub.2, --SO.sub.3 H, --SO.sub.3 M, --COOH, --COOM, --SX, or --CN;
- X is H, or an alkanol, alkamine, sulfoalkyl, carboxyalkyl, hydroxyaryl, sulfoaryl, carboxyaryl, or aminoaryl having from 1 to about 10 carbon atoms;
- M is H, Li, Na, K, Be, Mg or Ca;
- Q is --OR.sub.4, --N(R.sub.4).sub.2, --OZ, --OM, or halogen;
- Z is an aryl group or a substituted aryl group having from about 6 to about 14 carbon atoms;
- R.sub.1 is H or an alkyl group having from 1 to about 4 carbon atoms;
- R.sub.2 is H or an alkyl, alkanol, or alkamine group having from 1 to about 4 carbon atoms, or ##STR10## R.sub.3 is H or an alkyl group having from 1 to about 4 carbon atoms, phenyl, substituted-phenyl, or ##STR11## R.sub.4 is H or an alkyl, alkenyl, alkynyl, alkanol, alkenol, alkynol, keto alkyl, keto alkynyl, keto alkenyl, alkamine, alkoxy, polyalkoxyl, sulfoalkyl, carboxyalkyl, mercapto alkyl, or nitriloalkyl group having from 1 to about 12 carbon atoms, phenyl or substituted phenyl or ##STR12## R.sub.5 is H, --OH, or a hydroxyalkyl group having from 1 to about 4 carbon atoms;
- r is 1 to about 3;
- and mixtures thereof.
A process for electroplating a zinc deposit onto a substrate comprising electrodepositing zinc from a conductive aqueous solution containing zinc ions and a brightening amount of a water soluble brightening additive selected from the group consisting of a monomer of the following general formula and polymers thereof:
- ##STR13## wherein:
- n is from 1 to about 6;
- Y is --OX, --NX.sub.2, --SO.sub.3 H, --SO.sub.3 M, --COOH, --COOM, --SX, or --CN;
- X is H, or an alkanol, alkamine, sulfoalkyl, carboxyalkyl, hydroxyaryl, sulfoaryl, carboxyaryl, or aminoaryl having from 1 to about 10 carbon atoms;
- M is H, Li, Na, K, Be, Mg or Ca;
- Q is --OR.sub.4, --N(R.sub.4).sub.2, --OZ, --OM, or halogen;
- Z is an aryl group or a substituted aryl group having from about 6 to about 14 carbon atoms;
- R.sub.1 is H or an alkyl group having from 1 to about 4 carbon atoms;
- R.sub.2 is H or an alkyl, alkanol, or alkamine group having from 1 to about 4 carbon atoms, or ##STR14## R.sub.3 is H or an alkyl group having from 1 to about 4 carbon atoms, phenyl, substituted-phenyl, or ##STR15## R.sub.4 is H or an alkyl, alkenyl, alkynyl, alkanol, alkenol, alkynol, keto alkyl, keto alkynyl, keto alkenyl, alkamine, alkoxy, polyalkoxyl, sulfoalkyl, carboxyalkyl, mercapto alkyl, or nitriloalkyl group having from 1 to about 12 carbon atoms, phenyl or substituted phenyl or ##STR16## R.sub.5 is H, --OH, or a hydroxyalkyl group having from 1 to about 4 carbon atoms;
- r is 1 to about 3;
- and mixtures thereof.
Dependencies are inferred from the claim text.