Alkaline cyanide zinc electroplating
Abstract
Abstract AQUEOUS, ALKALINE CYANIDE ZINC ELECTROPLATING BATHS AND PROCESSES ARE PROVIDED WHICH ELECTRODEPOSIT BRIGHT ZINC AT LOW CYANIDE CONCENTRATIONS BY USING AS AN ADDITION AGENT A COMBINATION OF POLYETHYLENIMINE HAVING A MOLECULAR WEIGHT BETWEEN ABOUT 600 AND 60,000 AND A QUATERNARY PYRIDINE COMPOUND OF THE FORMULA: 1-R,3-((-)OOC-)PYRIDINIUM WHEREIN R IS ALKYL, ALKENYL OR ALKYNYL OF 1 TO 4 CARBON ATOMS, BENZYL AND SUBSTITUTED BENZYL WHEREIN THE SUBSTITUTENT IS AT LEAST ONE OF ALKYL OF 1 TO 4 CARBON ATOMS, HALOGEN, CYANIDE, ALKOXY OF 1 TO 4 CARBON ATOMS, PHENYL AND 1-((-)CH2-),3-((-)OOC-)PYRIDINIUM OR A HYDROHALIDE SALT THEREOF, THE WEIGHT RATIO OF POLYETHYLENIMINE TO QUATERNARY PYRIDINE COMPOUND BEING WITHIN THE RANGE OF 10:1 TO 1:100. THE ELECTROPLATING BATH HAS A WEIGHT RATIO OF CYANIDE TO ZINC WITHIN THE RANGE OF 0.1-3.5:1, PREFERABLY ABOUT 1:1.
Inventors
- 👤 P Hoyer
- 👤 J Rushmere
Bibliographic Details
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