Patent · US Expired

Alkaline bath for the electrolytic deposition of low carat yellow colored gold alloy layers

US4358351A · kind A · utility

8Cited by

3References

21Claims

0Family size

Assignee

Degussa AG · DE

Inventors

Franz Simon · Schmitten, DE
Werner Huth · Großkrotzenburg, DE
Bernd Dorbath · Alzenau, DE
Wolfgang Zilske · Hanau, DE

Key dates

Filing date	May 22, 1981
Grant date	Nov 9, 1982
Priority date	—
Expiry date	May 22, 2001

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC25D3/62
WIPO fieldSurface technology, coating
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.