Patent ID: 7052592

Claim:
A method of electrolytically plating a layer of metallic chromium on at least one substrate comprising the steps of: providing a bath with a single chamber having at least one anode and at least one cathode configured to receive at least a portion of a surface of said substrate, said anode and said cathode having a ratio of about 1:2, and containing an electrolyte comprising from about 50 to about 500 g/l trivalent chromium, from about 10 to 100 g/l of an oxalate, from about 20 to about 150 g/l aluminum sulphate, and from about 5 to about 30 g/l sodium fluoride; passing a current from said anode to said cathode through said electrolyte within said bath; maintaining a temperature and a pH of said electrolyte; periodically removing Na 2 SO 4 by-product from said bath; and depositing said trivalent chromium onto said surface of said substrate.