C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/78 (2006.01) C09D 5/44 (2006.01) C25D 13/04 (2006.01)
Patent
CA 2170878
A simplified process for producing a corrosion-protecting, well adhering lacquer coating, and the workpieces obtained thereby, is described. The process comprises - subjecting a metal substrate to a pre-treatment by spray of dip phosphate treatment and without subsequent passivation treatment, optionally after a drying, - carrying out an electrophoretic dip lacquer coating of the metal substrate treated in this way wherein an electro dip lacquer is used which contains bismuth in theform of an organic bismuth complex and/or a bismuth salt of an organic carboxylic acid in a content of 0.1 to 5 wt.% calculated as bismuth and related to the binder solids in the electro dip lacquer.
Selon le procédé décrit, on soumet un substrat métallique à un traitement préliminaire de phosphatation par pulvérisation ou par immersion et à un traitement ultérieur de passivation, le cas échéant après séchage, puis on effectue le trempage électrophorétique du substrat métallique ainsi traité en utilisant un vernis à immersion électrophorétique qui contient entre 0,1 et 5% en poids de bismuth sous forme d'un complexe organique de bismuth et/ou d'un sel de bismuth d'un acide carboxylique organique, par rapport au liant solide du vernis à immersion électrophorétique.
Hamacher Peter
Kerlin Klaus-Gunter
Herberts Gesellschaft Mit Beschrankter Haftung
Kirby Eades Gale Baker
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