ELECTRODEPOSITION OF CHROMIUM-MOLYBDENUM ALLOYS

Alloys of chromium and molybdenum, containing small amounts of the latter metal, have been deposited from solutions prepared by dissolving molybdic acid to the standard chromium plating solution. Bright, semi-bright and dull deposits of the alloys are obtained ; the dull metallic plates become bright after polishing. The optimum conditions fur the deposition of the alloy have been determined. An alloy containing 17% of molybdenum is deposited from a bath containing 400 g./litre Cr03, 360 g.; litre H2MoO4 and 4 g./litre H2SO4 at 40° and a current density of 1amp./sq. in. The deposits formed at higher current densities contain higher percentages of molybdenum and some oxygen