EP 2196563 A1 20100616 - Process for inhibiting tarnishing of silver coatings
Title (en)
Process for inhibiting tarnishing of silver coatings
Title (de)
Verfahren zur Verhinderung des Anlaufens von Silberschichten
Title (fr)
Procédé pour éviter le ternissement de couches d'argent
Publication
Application
Priority
EP 08021571 A 20081212
Abstract (en)
The method comprises applying a metal layer on a silver layer with a layer thickness of 5-100 nm, where the metal layer contacts the silver layer using an electrolyte containing metal ions, and applying a layer made of self-organized molecules on the metal layer. The silver layer is contacted with acidic electrolyte. A current is applied for applying the metal layer between the silver layer and a counter electrode in short-time. The electrolyte is contacted with a treatment solution, which has a reduction agent or metal reducible by the colloid metal. The method comprises applying a metal layer on a silver layer with a layer thickness of 5-100 nm, where the metal layer contacts the silver layer using an electrolyte containing metal ions, and applying a layer made of self-organized molecules on the metal layer. The silver layer is contacted with acidic electrolyte. A current is applied for applying the metal layer between the silver layer and a counter electrode in short-time. The electrolyte is contacted with a treatment solution, which has a reduction agent or metal reducible by the colloid metal. The electrolyte is present in a concentration of 1-10 g/l. A current density of 0.5-3 A/dm 2> is adjusted between the silver layer and the counter electrode. The current is applied for a time period of 1-10 seconds, where the time period is fixed with the stipulation in dependent of the current density and the concentration of the metal in the electrolyte, so that a layer thickness of the metal to be deposited is reached to 5-100 nm. An independent claim is included for a silver coating.
Abstract (de)
Die vorliegende Erfindung betrifft ein Verfahren zur Verhinderung des Anlaufens von Silber- oder Silberlegierungsschichten. Erfindungsgemäß werden Silber- oder Silberlegierungsschichten mit einer dünnen Schicht eines Metalls der Gruppe bestehend aus Palladium, Platin, Osmium und Rhenium beschichtet, wobei eine solche Beschichtung autokatalytisch oder galvanisch erfolgen kann. In einer Ausgestaltung der Erfindung wird auf die so abgeschiedene Metallschicht noch zusätzlich eine Schicht aus selbstorganisierenden Molekülen wie beispielsweise Hexadecanthiol, Oktadecanthiol und/oder einer Alkansulphonsäure oder deren Derivate aufgebracht. Die so behandelten Silber- oder Silberlegierungsschichten zeigen einen deutlich verbesserten Anlaufschutz und eine erhöhte Korrosionsbeständigkeit.
IPC 8 full level
C25D 3/50 (2006.01); C23C 18/16 (2006.01); C23C 18/18 (2006.01); C23C 18/44 (2006.01); C23C 18/48 (2006.01); C23C 26/00 (2006.01); C23C 28/00 (2006.01); C23F 11/16 (2006.01); C25D 3/56 (2006.01); C25D 5/48 (2006.01); C25D 5/18 (2006.01)
CPC (source: EP US)
C23C 18/1601 (2013.01 - EP); C23C 18/1658 (2013.01 - EP); C23C 18/166 (2013.01 - EP); C23C 18/1689 (2013.01 - EP); C23C 18/1841 (2013.01 - EP); C23C 18/44 (2013.01 - EP); C23C 18/48 (2013.01 - EP); C23C 26/00 (2013.01 - EP); C23C 28/023 (2013.01 - EP); C23F 11/161 (2013.01 - EP); C25D 3/50 (2013.01 - EP US); C25D 3/567 (2013.01 - EP); C25D 5/18 (2013.01 - EP US); C25D 5/48 (2013.01 - EP)
Citation (applicant)
EP 0538006 A1 19930421 - ENTHONE OMI INC [US]
Citation (search report)
- [X] GB 1443322 A 19760721 - OXY METAL INDUSTRIES CORP
- [X] EP 0116173 A1 19840822 - ALLIED CORP [US]
- [X] WO 9634412 A1 19961031 - NAT SEMICONDUCTOR CORP [US]
- [Y] GB 1423609 A 19760204 - SCHERING AG
- [Y] GB 2438198 A 20071121 - HOOPER ANDREW HERMISTON [GB]
Designated contracting state (EPC)
CZ DE FR IT
Designated extension state (EPC)
AL BA MK RS
DOCDB simple family (publication)
DOCDB simple family (application)
EP 08021571 A 20081212