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Electrophoretic Deposition of Polymer Films on Low Carbon Steel

IP.com Disclosure Number: IPCOM000090021D
Original Publication Date: 1969-Jan-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 13K

Publishing Venue

IBM

Related People

Drake, JM: AUTHOR

Abstract

Lattices of Nylon/Epoxy Ester/Surlyn and FEP/Epoxy Ester, described in C1 and C2 below, are deposited on low carbon steel via electrophoresis. Both aqueous polymer dispersion systems result in smooth, pore free, well adhered polymer films 5.0 to 15.0 mils thick.

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Electrophoretic Deposition of Polymer Films on Low Carbon Steel

Lattices of Nylon/Epoxy Ester/Surlyn and FEP/Epoxy Ester, described in C1 and C2 below, are deposited on low carbon steel via electrophoresis. Both aqueous polymer dispersion systems result in smooth, pore free, well adhered polymer films 5.0 to 15.0 mils thick.

The Nylon/Epoxy Ester/Surlyn, acid modified polyethylene, system exhibits a much greater resistance to organic solvents and elevated temperatures than Nylon/Epoxy Ester. These improved properties are explained by postulating the formation of a polyethylene matrix which encapsulates the Nylon/Epoxy Ester resin. The permanence of this matrix is insured by the crosslinking of the acid groups in the polyethylene.

Prior to electrophoresis, a phosphate conversion procedure is employed to form a thin film of iron phosphate at the substrate surface. This prevents anodic gassing at the steel substrate during polymer deposition, improves the adhesion of the deposited polymer film, and inhibits rust formation especially during the period of polymer film formation and drying.

In connection with the complete coating processes
A. Arrange cleaned steel part to be coated as anode of

a phosphating bath, 50% ortho phosphoric acid. Coat

at a potential of +0.40 to +0.50 V DC versus a

saturated calomel electrode for 15 to 30 minutes.
B. Rinse in distilled water and blow dry.
C. Arrange phosphated part as anode of electrophoretic

coating bath which is either

1. 75...