Cationic electrodeposition process and coating composition...

C - Chemistry – Metallurgy – 09 – D

Patent

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C09D 5/44 (2006.01) C25D 13/00 (2006.01)

Patent

CA 2232638

A cation electrodeposition coating process and cation electrodeposition coating composition that have a sufficient throwing power are provided. A process for cationic; electrodeposition coating which comprises the steps of: (1) immersing a substrate in a cationic electrodeposition coating composition; (2) applying a voltage between an anode and said substrate, which serves as a cathode, to thereby cause coat film deposition; and (3) further applying a voltage to the coat film deposited so as to increase electric resistance per unit volume of said coat film, wherein, in said step (3), coat films are deposited at those sites of the substrate where coat films have not yet been deposited, said cationic electrodeposition coating composition having a time point when the electric: resistance per unit volume of the coat film deposited increases in the course of electrodeposition under constant-current conditions.

Cette invention concerne un procédé d'électrodéposition cationique, ainsi qu'une composition de revêtement destinée à ce procédé et pouvant avoir un pouvoir de pénétration élevé. Ce procédé comprend les étapes suivantes: (1) immerger un substrat dans la composition de revêtement pour électrodéposition cationique; (2) appliquer une tension entre le substrat, tel qu'une cathode, et une anode de manière à former un dépôt; et (3), appliquer une autre tension sur le dépôt de manière à accroître sa résistance électrique par unité de volume. L'étape (3) permet de former un dépôt sur les zones du substrat qui ne comportent pas de revêtement. La composition de revêtement est choisie de manière à ce qu'à un moment donné, la résistance électrique du dépôt par unité de volume puisse augmenter lors du processus d'électrodéposition se déroulant dans des conditions de courant constant.

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