Electrocomposite coatings for hard chrome replacement

Details Electrocomposite coatings for hard chrome replacement Electrocomposite coatings for hard chrome replacement

C - Chemistry, Metallurgy

25

D

C25D 3/56 (2006.01) C25D 5/50 (2006.01) C25D 15/00 (2006.01)

Patent

CA 2676438

The invention provides a method and system for electrolytically coating an article. The method includes providing an article to be coated and disposing the article in an electrolytic cell. The cell includes an anode, a cathode in operable communication with the article, and an electrolyte bath. During electrolysis, the electrolyte bath comprises cobalt ions, phosphorous acid, and tribological particles selected from the group consisting of refractory materials, solid lubricants and mixtures thereof dispersed therein. The method further includes applying steady direct electric current through the anode, the electrolyte bath and the cathode to coat the article with cobalt, phosphorous and the tribological particles. An improved composition of matter is also provided that may be used as a coating, or the composition may be electroformed on a mandrel to form an article made from the composition of matter.

L~invention concerne un procédé et un système de revêtement électrolytique. Le procédé implique de placer un article à revêtir dans une cuve électrolytique. La cuve comprend une anode, une cathode en communication fonctionnelle avec ledit article et un bain électrolytique. Pendant l~électrolyse, le bain électrolytique contient des ions cobalt, de l~acide phosphoreux et, dispersées dans le bain, des particules tribologiques choisies dans le groupe comprenant des matériaux réfractaires, des lubrifiants solides et leurs mélanges. Le procédé implique en outre d~appliquer un courant électrique continu constant à l~anode, au bain électrolytique et à la cathode, afin de revêtir l~article de cobalt, de phosphore et de particules tribologiques. L~invention concerne également une composition de matière améliorée qui peut être utilisée en tant que revêtement, ou qui peut être électro-formée sur un mandrin afin de fabriquer un article à partir de ladite composition.

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