Electrolytic production of chromium surface coatings

Details Electrolytic production of chromium surface coatings Electrolytic production of chromium surface coatings

C - Chemistry, Metallurgy

25

D

204/23

C25D 3/04 (2006.01) C25D 5/18 (2006.01)

Patent

CA 1257845

-13- ABSTRACT: In the molten salt bath electroplating of chromium onto a substrate, such as stainless steel, the substrate, a reference electrode and a chromium anode are put into a molten salt bath (e.g. a lithium chloride/potassium chloride mixture) containing Cr2+ ions and one or more short-duration over-potential pulses (typically 200 mV to 1V with respect to ECr2+/Cr°) are applied to the substrate with respect to the reference electrode to form a plurality of small nuclei on the substrate and, subsequently, a much smaller over-potential, conveniently a continuous potential, is applied for deposition of the coating.

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