Alkaline solution, without cyanide, for electroplating gold alloys, a method for electroplating and a substrate comprising a shiny, corrosion-free deposit of a gold alloy

摘要

Alkaline electroplating solution, without cyanide for electroplating a gold and copper alloy, comprising a) from 0.5 to 10 g / l gold ions; b) from 0 to 3 g / l of zinc, iron or indium ions; c) 70 to 200 g / l of a sulphite sa d) 0.1 to 8 g / l copper ions; e) from 0 to 75 g / l of a complexing agent that is different from hydantoin, a salt thereof or 5,5-dimethylhydantoin, characterized in that the electroplating solution further comprises 1.0 to 40 g / l of hydantoin, a salt thereof or 5,5-dimethylhydantoin, in which the sulphite salt is sodium sulphite and / or potassium sulphite.