Chemistry: electrical and wave energy – Processes and products
Patent
1978-06-14
1979-09-18
Edmundson, F. C.
Chemistry: electrical and wave energy
Processes and products
204 46G, C25D 348, C25D 362
Patent
active
041682149
ABSTRACT:
An aqueous bath for the electroplating of gold is particularly adapted for plating a gold strike on stainless steel and includes about 2 to 16.5 grams per liter of auric(III) gold in a cyanide complex. Potassium nitrate is employed as an electrolyte and ethylenediamine hydrochloride is added as a complexer. Nickel, cobalt, copper, tin, or indium ions may be present as an alloying ingredient for the gold and pH of the bath is not more than 4.0, preferably not more than 1.5. In the method of preparing the bath, an aqueous solution of potassium gold chloride KAu(Cl).sub.4 and potassium nitrate is prepared. Potassium cyanide is added to the solution and reacts with the potassium gold chloride to form a gold cyanide complex. Ethylenediamine hydrochloride is then added to the solution. The ethylenediamine hydrochloride may include nickel chloride or other salts to provide the alloying metal additives for the gold and hydrochloric acid may be added to adjust the pH.
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patent: 2660554 (1953-11-01), Ostrow
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patent: 3174918 (1965-03-01), Rinker et al.
patent: 3458542 (1969-07-01), Moore et al.
patent: 3642589 (1972-02-01), Nobel et al.
Fletcher Augustus
Moriarty William L.
American Chemical and Refining Company, Inc.
Edmundson F. C.
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