EP 1103637 A1 20010530 - Method of producing AuCuGa alloy coating using electrolysis, and alloys produced by such a method
Title (en)
Method of producing AuCuGa alloy coating using electrolysis, and alloys produced by such a method
Title (de)
Verfahren zur Herstellung einer AuCuGa-Legierungsbeschichtung unter Verwendung von Elektrolyse und nach diesem Verfahren hergestellte Legierungen
Title (fr)
Procédé de fabrication d'une couche en alliage AuCuGa en utilisant l'électrolyse et les alliages obtenus par ce procédé
Publication
Application
Priority
EP 99402969 A 19991129
Abstract (en)
The present invention relates to a method of producing a gold-copper-gallium (AuCuGa) alloy coating by electrodeposition on a substrate (2), using an aqueous electrolytic bath. The method is characterized in that the aqueous electrolytic bath comprises potassium aurocyanide (KAu(CN)2), copper cyanide (CuCN), potassium cyanide (KCN) or sodium cyanide (NaCN), and a gallium salt (e.g. gallium sulfate Ga2(SO4)3). In particular, the molar concentration of gold cations (ÄAu<+>Ü), copper cations (ÄCu<+>Ü) and gallium cations (ÄGa<3+>Ü) in the electrolytic bath is respectively comprised within the following ranges: 0,19 g/l ≤ ÄAu<+>Ü ≤ 2,17 g/l (0,1.10<-2> mol/l ≤ ÄAu<+>Ü ≤ 1,1.10<-2> mol/l); 0,31 g/l ≤ Äcu<+>Ü ≤ 1,59 g/l (0,5.10<-2> mol/l ≤ ÄCu<+>Ü ≤ 2,5.10<-2> mol/l); and 0,69 g/l ≤ ÄGa<3+>Ü ≤ 2,79 g/l (1.10<-2> mol/l ≤ ÄGa<3+>Ü ≤ 4.10<-2> mol/l). Such a method allows to provide an AuCuGa alloy coating having brightness and ductility properties which are equivalent to those of the prior art AuCuCd alloy coatings.
IPC 1-7
IPC 8 full level
C25D 3/62 (2006.01)
CPC (source: EP)
C25D 3/62 (2013.01)
Citation (search report)
- [A] FR 2405312 A1 19790504 - OXY METAL INDUSTRIES CORP [US]
- [A] GB 1594011 A 19810730 - OXY METAL INDUSTRIES CORP
- [A] FR 2402718 A1 19790406 - METAUX PRECIEUX SA [CH]
Designated contracting state (EPC)
DE ES FR GB
DOCDB simple family (publication)
EP 1103637 A1 20010530; AU 1755101 A 20010604; TW 546418 B 20030811; WO 0138609 A1 20010531
DOCDB simple family (application)
EP 99402969 A 19991129; AU 1755101 A 20001122; TW 90110429 A 20010501; US 0030153 W 20001122