| 摘要 |
<p>Electrolytic deposit in the form of a gold alloy whose assay is higher than or equal to 14 carats, containing zinc and copper, and process for its manufacture. This deposit is free from toxic metals or metalloids, with a colour of between the 1N and 3N ranges (according to ISO standard 8654), ductile to a thickness of 10 microns and shiny. In addition, this deposit has a very high resistance to tarnishing. The process for its production comprises an electrolysis in an alkaline galvanic bath containing gold potassium cyanide, copper cyanide, zinc oxide, sodium cyanide, sodium hydroxide, iminodiacetic acid and a surfactant. This electrolysis may be followed by a heat treatment at at least 150 DEG C for at least one hour.</p> |
