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Protection of Critical Metallic Surfaces by Electrophoretically Deposited Coatings

IP.com Disclosure Number: IPCOM000075666D
Original Publication Date: 1971-Oct-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Auletta, LV: AUTHOR [+5]

Abstract

This electrophoretic deposition technique is for forming, upon a metal surface of terminals of memory arrays, an insulative coating to protect the surface against hostile corrosive environments. A blending of co-dispersed aqueous latices of two polymer resins is used. One resin is selected from the group of polyvinylidene resins consisting of (a) vinylidene chloride polymers, (b) vinylidene fluoride polymers and (c) vinylidene chloride copolymers. The other resin consists of epoxy ester.

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Protection of Critical Metallic Surfaces by Electrophoretically Deposited Coatings

This electrophoretic deposition technique is for forming, upon a metal surface of terminals of memory arrays, an insulative coating to protect the surface against hostile corrosive environments. A blending of co-dispersed aqueous latices of two polymer resins is used. One resin is selected from the group of polyvinylidene resins consisting of (a) vinylidene chloride polymers, (b) vinylidene fluoride polymers and (c) vinylidene chloride copolymers. The other resin consists of epoxy ester.

A suitable electrophoretic plating bath is provided in the coating vessel shown by introducing thereinto 85% of DARAN X-225* polyvinylidene resin latex and 15% of ARALDITE DP-624** epoxy ester resin latex. These latices, respectively, contain about 61% and 50% solids by weight. About 1.5% of a 30% solids content AQUABLAK K*** carbon black is added to the * Trademark of W. R. Grace & Co: ** Trademark of Ciba Co., Inc. *** Trademark of Columbia Carbon Co. coating bath to impart color. The coating bath then consists of about 1000 grams of the polyvinylidene epoxy ester latices and about 15 grams of the carbon black suspension.

The diaphragm shown in the bottom of the vessel is a porous polyethylene sheet. It is used to break-up and/or intercept hydrogen bubbles formed at the cathode and yet permit the passage of the suspended resins.

After washing the array in a fluorinated hydrocarbon bath and then i...