C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/35
C25D 3/04 (2006.01)
Patent
CA 1057231
NOVEL CHROMIUM PLATING PROCESS Abstract of the Disclosure - In accordance with one of its aspects, this invention relates to novel compositions and to a process for electroplating chromium plate onto a basis metal which comprises passing current from an anode to a cathode at least a portion of which contains a conductive metal layer through an aqueous acidic chromium plating solution, at least one chromium compound providing hexavalent chromium ions for electroplating chromium and aluminum ions in combination with fluoride ions and sulfate ions and maintaining a molar ratio of total fluoride to total aluminum of from 0.5 to 6, for a time sufficient to deposit a chromium electroplate. In accordance with another of its aspects, this invention relates to novel compositions and to a process for electroplating chromium plate onto a basis metal which comprises passing current from an anode to a cathode at least a portion of which contains a conductive metal layer through an aqueous acidic chromium plating solution containing at least one chromium compound providing hexavalent chromium ions for electroplating chromium, sulfate ions, fluoride ions, complex fluoride ions, wherein at least one member selected from the group consisting of AlF3 Al2F6 AlF3XH2O Na3AlF6 and Al2F6XH2O, where X is a lower integer, is maintained in the solid phase for a time sufficient to deposit a chromium electroplate. - i -
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