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Patents

Chromium Plate Replacement Coating

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By: KERRY PIANOFORTE

Editor, Coatings World, Coatings World

U.S. 8,246,807 B2
Hamilton Sundstrand Corporation has been granted a patent for a process for forming a coating on an article. The process is comprised of the steps of providing an article to be coated; forming a coating having a cobalt material matrix with carbide particles distributed in the cobalt material matrix on the article; the forming step is comprised of providing an electroplating bath solution having a chemistry of from approximately 180 to 210 g/l cobalt chloride, from approximately 0.05 to 2.0 g/l cobalt carbonate, from 45 to 55 g/l ortho-phosphoric acid, and from approximately 5.0 to 15 g/l of phosphorous acid; the electroplating bath solution providing step further comprised of placing a volume of carbide particles in the bath solution sufficient to result in from approximately 15% to 30% volume of carbide particles in a final coating; and
placing the article in contact with the bath solution and applying a current to deposit the coating onto the article.

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