Electrophoretic Deposition of Aluminide Coatings from Aqueous Suspensions

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Abstract
A process was developed on a laboratory scale for electrophoretic deposition of metals from aqueous suspensions formed by mixing metal powder or flake with an amine solubilized acrylic resin, glycerol, and a detergent wetting agent in deionized water. Electrophoretic deposition parameters are discussed in terms of deposits formed from aluminum flake on B‐1900 alloy. From this basis, the process was extended to the deposition of bisque envelopes for the formation of aluminide coatings modified with additions of Cr, Si, and a Ti coating containing . Electrophoretically deposited coatings provided protection against dynamic hot corrosion (sulfidation) for times comparable to those observed for conventionally processed coatings.

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