Electrodeposition coatings for use over aluminum substrates
AssigneePPG Industries Ohio, Inc.
InventorsJoseph T. Valko, Robin M. Peffer, Craig A. Wilson, Alan J. Kaylo
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Abstract
A process for applying a coating on aluminum substrates by anionic electrodeposition of a phosphated epoxy resin made by phosphating a polyepoxide with both phosphoric acid and an organophosphonic acid and/or an organophosphinic acid. The coating has a reduced tendency to form pinholes.
Claims12
A process for providing a coating on an aluminum substrate by passing electric current between the substrate acting as an anode and a cathode in electrical contact with an electrodeposition bath containing an aqueous dispersion of a base-neutralized resinous composition containing an ungelled phosphated epoxy resin in which the phosphated epoxy resin comprises a mixture of the reaction product of one or more polymeric epoxy compounds with phosphoric acid and with an organophosphonic acid and/or an organophosphinic acid.
Dependencies are inferred from the claim text.