C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/97.05
C25D 13/10 (2006.01) C09D 5/44 (2006.01) C25D 13/24 (2006.01)
Patent
CA 2003645
13 Abstract 1. The use of nitric acid and/or nitrous acid for the neutralization of coating baths for cathodic electro dip lacquering. 2.1. The anode plates of cathodic electro dip lacquering baths are severely attacked by halide ions. This has hitherto been prevented by the addition of a salt, e.g. copper nitrate. A process is now to be provided for protecting the anode continuously without the addition of undesirable accompanying substances. 2.2. Cathodic electro dip lacquering is carried out in an aqueous coating bath containing a basic or amphoteric film former capable of being converted into an aqueous solution or dispersion by neutral- ization with acid, free nitric acid and/or nitrous acid being used for neutralization, and/or the pro- cess being carried out in the presence of an electro dialysis membrane which has been charged with nitric acid and/or nitrous acid. 2.3. Cathodic electro dip lacquering of surfaces of electrically conductive substrates which are connected as cathode.
Kerlin Klaus-Gunter
Klein Klausjorg
Herberts Gesellschaft Mit Beschrankter Haftung
Kerlin Klaus-Gunter
Kirby Eades Gale Baker
Klein Klausjorg
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