Electrodeposition coating process in continuous electrodeposition coating plants

Abstract

A process for electrodeposition coating electrically conductive substrates in continuous electrodeposition coating plants, wherein, in the event of a shutdown of the conveying means, conventionally a belt, all the substrates not in motion and immersed in the electrodeposition coating tank are, at the latest after a brief de-energized interruption, completely coated while ensuring at least the nominal deposition period at the nominal deposition voltage, and then the completely coated, still immersed substrates not in motion remain de-energized in the electrodeposition coating tank and, when the conveying means has restarted, the substrates remain de-energized until reaching the end of the electrodeposition coating tank and are removed therefrom.

What is claimed is:  
     
         1 . A process for electrodeposition coating electrically conductive substrates in continuous electrodeposition coating plants by conveying conductive substrates connected as deposition electrodes through an electrodeposition tank containing an electrocoating bath via a conveying means, wherein, in the event of a shutdown of the conveying means, all the substrates not in motion and immersed in the electrodeposition coating tank are, at the latest after a brief de-energized interruption, completely coated while ensuring at least the nominal deposition period at the nominal deposition voltage, and then the completely coated, still immersed substrates not in motion remain de-energized in the electrodeposition coating tank and, when the conveying means has restarted, the substrates remain de-energized until reaching the end of the electrodeposition coating tank and are removed therefrom.  
     
     
         2 . The process according to  claim 1 , wherein the brief de-energized interruption is no longer than 5 minutes.  
     
     
         3 . The process according to  claim 1 , wherein electrodeposition coating of the substrates not in motion and immersed in the electrocoating bath is taken to completion without interruption.  
     
     
         4 . The process according to  claim 1 , wherein the electrically conductive substrates comprise substrates selected from the group consisting of automotive bodies, automotive body parts, metal furniture and agricultural machinery.