Electrolessly plating workpiece with nickel and after...

Details Electrolessly plating workpiece with nickel and after... Electrolessly plating workpiece with nickel and after...

C - Chemistry, Metallurgy

25

D

204/18.7

C25D 5/40 (2006.01) C25D 5/34 (2006.01) C25D 7/10 (2006.01)

Patent

CA 1227451

ABSTRACT OF THE DISCLOSURE The invention is directed to a method of applying a corrosion-proof and wear-resistant coating to the piston rod of a hydraulic ram which is intended to be used in an underground mine working, or in similar workings. The method comprises the steps of applying a layer of nickel to the piston rod using a currentless nickel-plating process, and then applying a microcracked hard-chromium layer to the nickel layer. The nickel layer is of high density, tensile strength and ductility. Before the application of the microcracked hard-chromium layer, the previously-applied nickel layer is activated electrolytically in a sulphuric acid bath, in order to improve the adhesion of the hard-chromium layer to the nickel layer.

428813

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