EP 2157213 B1 20121024 - Anti-corrosion coating with two zinc layers
Title (en)
Anti-corrosion coating with two zinc layers
Title (de)
Korrosionsschutzbeschichtung mit zwei Zinkschichten
Title (fr)
Couche de protection contre la corrosion dotée de deux couches de zinc
Publication
Application
Priority
EP 08014206 A 20080808
Abstract (en)
[origin: EP2157213A1] The method comprises depositing a first zinc layer with a thickness of 15mu m in an acid galvanic bath and a second zinc layer with a thickness of 25mu m in an alkali galvanic bath. The pH value of the acid bath is 12-14. The treatment duration in the acid galvanic bath is 15 min. The flow density in the acid bath is 0.3 A/dm 2>and the flow density in the alkali bath is 0.5 A/dm 2>. The acid galvanic bath consists of 10-60 g/l of zinc, 80-200 g/l of chloride and 10-40 g/l of boric acid or 5-20 g/l of zinc and 50-200 g/l of sodium hydroxide. The method comprises depositing a first zinc layer with a thickness of 15mu m in an acid galvanic bath and a second zinc layer with a thickness of 25mu m in an alkali galvanic bath. The pH value of the acid bath is 12-14. The treatment duration in the acid galvanic bath is 15 min. The flow density in the acid bath is 0.3 A/dm 2>and the flow density in the alkali bath is 0.5 A/dm 2>. A thick-coat passivation is deposited directly on the second zinc layer and if necessary a cataphoretic coating is applied directly on the thick-coat passivation and/or on the second zinc layer.
IPC 8 full level
C25D 3/22 (2006.01); C25D 5/10 (2006.01); C25D 5/48 (2006.01)
CPC (source: EP US)
C25D 3/22 (2013.01 - EP); C25D 5/10 (2013.01 - EP US); C25D 5/48 (2013.01 - EP); C25D 5/617 (2020.08 - EP US); C25D 5/625 (2020.08 - EP US)
Designated contracting state (EPC)
AT DE FR GB IT
DOCDB simple family (publication)
DOCDB simple family (application)
EP 08014206 A 20080808