Alkaline bath for the electrolytic deposition of low carat yellow colored gold alloy layers
AssigneeDegussa AG
InventorsFranz Simon, Werner Huth, Bernd Dorbath, Wolfgang Zilske
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Abstract
For the production of low carat rose to gold colored gold alloy coatings there are needed electrolytic baths containing soluble gold cyanide, soluble copper cyanide, potassium carbonate or potassium bicarbonate which produce corrosion resistant coatings of 13-18 carats and no physiologically hazardous cadmium. The baths of the present invention contain, in place of cadmium, 7.5 to 40 grams/liter of zinc as complex zinc cyanide.
Claims21
An aqueous alkaline bath suitable for electrolytically depositing low carat rose to gold colored gold alloy coatings comprising soluble gold cyanide, soluble copper cyanide, potassium carbonate or potassium bicarbonate and 7.5-40 g/l of zinc as a complex zinc cyanide.
Dependencies are inferred from the claim text.