Electrodeposition coating system

C - Chemistry – Metallurgy – 25 – D

Patent

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C25D 13/00 (2006.01) B01D 61/46 (2006.01) C25D 13/22 (2006.01)

Patent

CA 2017736

An electrodeposition coating system used in an automatic coating process for a motor vehicle or the like. This system comprises: an article to be coated as a first electrode, which is disposed in an electrodeposition bath, and at least two second electrodes provided in association with the article; and current is passed between the both sets of electrodes through an aqueous solution of a substance for forming a coating contained in the bath, to thereby electrodeposit the substance onto the article. The second electrodes consist of two groups of electrodes, the electrodes of the first group of these second electrodes include electrode members constituted by corrosion-resisting members, integrally provided with a first membrane positioned therearound for precluding most of the flow of an ionized neutralizing agent contained in the aqueous solution, and which is attracted by the electrode members, and the electrodes of the second group include electrode members which are each integrally provided with a second membrane portioned therearound, for osmotically extracting the neutralizing agent.

Divulgation d'un système d'électrodéposition employé dans un procédé d'obtention d'un revêtement pour un véhicule automobile ou pour un engin similaire. Ce système comprend : un article à revêtir constituant une première électrode, qui est placé dans un bain d'électrodéposition, et au moins deux autres secondes électrodes associées à l'article. On fait passer un courant entre les deux ensembles d'électrodes baignant dans une solution aqueuse de la substance destinée à former le revêtement, afin d'obtenir le dépôt électrolytique de la substance sur l'article à revêtir. Les secondes électrodes consistent en deux groupes d'électrodes, les électrodes du premier de ces deux groupes comprennent des éléments résistants à la corrosion dotés d'une première membrane les entourant complètement et destinée à entraver presque entièrement la circulation d'un agent neutralisant ionisé contenu dans la solution aqueuse, et qui est attiré par les éléments de l'électrode, et les électrodes du deuxième groupe comprennent des éléments d'électrode complètement entourés d'une seconde membrane, laquelle sert à extraire par osmose l'agent neutralisant.

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