Trivalent chromium electrolyte and process

Details Trivalent chromium electrolyte and process Trivalent chromium electrolyte and process

C - Chemistry, Metallurgy

25

D

204/35

C25D 3/06 (2006.01) C25D 21/18 (2006.01)

Patent

CA 1244376

Abstract of the Disclosure An aqueous acidic trivalent chromium electrolyte and process for electrodepositing chromium platings comprising an electrolyte containing trivalent chromium ions, a complexing agent, halide ions, ammonium ions and an additive agent comprising a metal ion selected from the group consisting of neodymium, gold, silver, platinum, palladium, rhodium, iridium, osmium, ruthenium, rhenium, gallium, germanium, indium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, praseodymium, scandium, yttrium, lanthanum, titanium, hafnium, arsenic, selenium, tellurium, cerium, uranium, and mixtures thereof, present in an amount sufficient to reduce the concentration of hexavalent chromium ions formed in the bath at a level at which satisfactory chromium electrodeposits are obtained. 47

453954

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