ELECTRODEPOSITION COATING FOR USE OVER ALUMINUM SUBSTRATE

摘要

PROBLEM TO BE SOLVED: To provide an electrodeposition coating for use over an aluminum substrate.

SOLUTION: One problem with the electrodeposition coating is the formation of pinholes in the coating which give a rough coating with poor appearance. The present invention relates to the use of electrodeposition to provide coatings on aluminum substrates in which the coating has an improved appearance. A process for applying a coating on the 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.

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