Method of obtaining a yellow gold alloy deposition by galvanoplasty without using toxic materials
AssigneeThe Swatch Group Research and Development Ltd
InventorsChristophe Henzirohs, Guido Plankert
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Abstract
The invention concerns the field of galvanic depositions and relates to a method of galvanoplastic deposition of a gold alloy on an electrode dipped into a bath including metal gold in alkaline aurocyanide form, organometallic compounds, a wetting agent, a sequestering agent and free cyanide. According to the invention, the alloy metals are copper, in double copper and potassium cyanide form, and silver in cyanide form, allowing a mirror bright yellow gold alloy to be deposited on the electrode.
Claims3
1-11. (canceled)
An electrolytic deposition in the form of a gold alloy obtained by a method for the galvanoplastic deposition of a gold alloy on an electrode, the method comprising the steps of:
- (a) providing an electrode;
- (b) dipping the electrode into a bath, wherein the bath includes gold metal in alkaline aurocyanide form, organometallic compounds, a wetting agent, a sequestering agent and free cyanide, wherein the gold alloy includes a plurality of alloy metals, and wherein the plurality of alloy metals are copper metal, in copper and double potassium cyanide form, and silver metal, in cyanide form;
- and
- (c) galvanoplastically depositing a gold alloy on the electrode, wherein the bath has a proportion of 9.08% gold, 90.85% copper and 0.07% silver containing neither cadmium nor zinc, thereby depositing a bright 3N colour gold alloy, wherein the bright 3N colour gold alloy is made of 75% gold, 21% copper and 4% silver;
- wherein the thickness of the electrolytic deposition is between 1 and 800 microns and which includes copper, wherein it includes silver as the third main compound having a bright 3N colour.
An electrolytic deposition in the form of a gold, copper and silver alloy wherein the deposition is made of 75% gold, 21% copper and 4% silver, having a bright 3N colour.
Dependencies are inferred from the claim text.