Method of electrocoating

Details Method of electrocoating Method of electrocoating

1977-05-09

1979-11-20

Williams, Howard S.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204181C, 204181E, C25D 1316

Patent

active

041750187

ABSTRACT:
A method for coating an electroconductive article such as a continuous length of flat metal sheet is disclosed. The method of the invention involves passing the electroconductive article into an aqueous electrodeposition bath which contains as the electrocoating vehicle a water-soluble resinous coating material in combination with a water-insoluble emulsified resinous material. The vehicle is electrodeposited on said metal sheet to form a primer coating as the electroconductive article passes through the electrodeposition bath. A top coat is applied to said primer without having previously baked the primer, and the topcoated metal is then passed to a baking station where the top coat and primer coat are baked simultaneously.
The combination of solubilized and emulsified resinous materials offers a number of processing advantages. For example, the electrodeposition bath can be operated at higher temperatures than are normally associated with electrodeposition and since only one baking station is needed, equipment and fuel costs are minimized.

REFERENCES:
patent: 3340172 (1967-09-01), Huggard
patent: 3663383 (1972-05-01), Matsuda et al.

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