Process for the electrodeposition of a chromium coating containi

Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Coating contains embedded solid material

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205110, 205111, 205112, 205287, C25D 1500, C25D 500, C25D 306

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058689176

ABSTRACT:
Process suitable for providing a substrate with a protective coating based on chromium, including a chromium matrix in which solid particles are distributed. The process includes a step of electrodeposition of the coating carried out by passing an electric current between a cathode or cathodes of the substrate to be coated and an anode or anodes. The cathode(s) and anode(s) are immersed in an electroplating solution, wherein the electroplating solution is based on an aqueous solution including trivalent chromium obtained from the reduction of chromic acid by a reducing agent, and contains solid particles.

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Takaya et al., "Trivalent Chromium Composite Coatings Containing Silicon Carbide or Diamond Particles", Plating & Surface Finishing, 74(9), 70-72, Sep. 1987.
Patent abstracts of Japan, vol. 18, No. 572 (M-1696) Nov. 2, 1994 & JP-A-06210306 (Nippon Steel Corporation) Aug. 2, 1994--Abstract.
Metal Finishing, vol. 64, No. 6, Jun. 1996, USA pp. 107-109, Dominikov "Plating from trivalent chromium solutions".
Plating & Surface Finishing, vol. 74, No. 9, Sep. 1987, USA pp. 70-72, Takaya "Trivalent chromium composite coatings containing silicon carbide or diamond particles" p. 70; table 1.

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