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Technique For An Electrophoretic Coating Process

IP.com Disclosure Number: IPCOM000048543D
Original Publication Date: 1982-Feb-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Clark, RJ: AUTHOR [+2]

Abstract

This article describes a technique which utilizes an electrophoretic deposition of a polymer coating onto a workpiece. Electrophoretic deposition is accomplished through the movement of suspended particles of polymer through a carrier fluid under the action of an electromotive force applied to electrodes in contact with the suspension. The fluid itself is determined by the chemical solubility parameters of the polymer being used and can be either a liquid or an atomized vapor. The workpiece, one of the electrodes in the fluid, is coated in a manner similar to that of conventional electroplating.

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Technique For An Electrophoretic Coating Process

This article describes a technique which utilizes an electrophoretic deposition of a polymer coating onto a workpiece. Electrophoretic deposition is accomplished through the movement of suspended particles of polymer through a carrier fluid under the action of an electromotive force applied to electrodes in contact with the suspension. The fluid itself is determined by the chemical solubility parameters of the polymer being used and can be either a liquid or an atomized vapor. The workpiece, one of the electrodes in the fluid, is coated in a manner similar to that of conventional electroplating.

Low resistance metal oxides in graphite-filled, protective coating materials together with a rigid foam sheet for holding modules under treatment, insoluble in the suspension, are used for the present electrophoretic phoretic coating technique. Numerous formulations of suspensions of various organic polymers have been defined. The specific foam used as a support for the workpiece is dependent upon the specific polymer and carrier fluid. A key requirement is that the coating materials be conductive and insoluble in the suspension. The detailed process is set out below.

The workpiece to be electrophoretically coated is firmly held in contact with a rigid, open pore, graphite filled, conductive foam sheet which is insoluble in the solution. The open-pore conductive foam sheet is then placed in the electrophoretic bath, and cur...