Zinc electroplating bath having low cyanide content
Abstract
Abstract A BATH FOR ELECTROPLATING ZINC CONTAINING IN AQUEOUS SOLUTION A ZINC SALT, AN ALKALI METAL CYANIDE, AN ALKALI METAL HYDROXIDE, AN ALDEHYDE-ALKANOLAMINE CONDENSATION PRODUCT, A WATER SOLUBLE POLYVINYL ALCOHOL AND OPTIONALLY SALTS OF METALS OF GROUPS VII-B OR VIII OF THE PERIODIC TABLE OF ELEMENTS AND FURTHER TRICOTONYLENE TETRAMINE AND TRITHIONE (3-THIO-3H-1,2-DITHIOLE), SAID BATH HAVING A LOW CYANIDE CONTENT, YIELDS HIGHLY BRILLANT ZINC COATINGS WITH VERY GOOD THROWING POWER AND METAL DISTRIBUTION. PREFERRED ALDEHYDE-ALKANOLAMINE CONDENSATION PRODUCTS ARE CONDENSATION PRODUCTS OF A MONO-ALKANOLAMINE WITH AN AROMATIC ALDEHYDE OF THE GENERAL FORMULA (O=CH-),(R)X-BENZENE WHEREIN R IS HYDROXYL AND/OR LOWER ALKOXY HAVING FROM 1 TO 4 CARBON ATOMS AND X IS ZERO, ONE, OR TWO.
Inventors
- 👤 R Koch
Bibliographic Details
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