Method for improving the macro throwing power for chloride zinc electroplating baths
AssigneePavco, Inc.
InventorLeonard L. Diaddario, Jr.
Life of this patent
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Abstract
An aqueous acid plating bath for the electro-deposition of a zinc or zinc alloy deposit on a substrate which includes zinc ions and an additive of the general formula ##STR1## wherein R.sub.1 and R.sub.2 are selected from the following functional groups hydroxyl, carbonyl, carboxylic acid or its salt; R.sub.3 is selected from the following groups hydrogen, hydroxyl, carbonyl, carboxylic acid or its salts; R.sub.4 and R.sub.5 are electron withdrawing groups, such as but not totally inclusive, halides, sulfonic acid or its salts, triflouromethyl, cyano, and amino groups.
Claims15
An aqueous acid plating bath for the electro-deposition of a zinc or zinc alloy deposit on a substrate which includes;
- i) zinc ions;
- and
- ii) an additive to increase throwing power of the general formula:
- ##STR4## wherein R.sub.1 and R.sub.2 are selected from the following functional groups hydroxyl, carboxylic acid or its salt;
- R.sub.3 is selected from the following groups hydrogen, hydroxyl, carboxylic acid or its salt;
- R.sub.4 and R.sub.5 are electron withdrawing groups selected from the group consisting of halides sulfonic acid or its salt, trifluoromethyl, and cyano.
A electro-deposition process of coating a metal article comprising immersing said metal article in a bath comprising zinc ions and an additive to increase throwing power of the general formula ##STR5## wherein R.sub.1 and R2 are selected from the following functional groups hydroxyl, carboxylic acid or its salt;
- R.sub.1 is selected from the following groups hydrogen, hydroxyl, carboxylic acid or its salt;
- R.sub.4 and R.sub.5 are electron withdrawing groups selected from the group consisting of halides, sulfonic acid or its salt, trifluorometyl and cyano.
Dependencies are inferred from the claim text.