Precision electroplating of metal objects

Chemistry: electrical and wave energy – Processes and products

Patent

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Details

204290F, C25D 704, C25D 1710

Patent

active

042946700

ABSTRACT:
A layer of metal of predetermined uniform thickness is electroplated onto the surface of a metal object by the use of a special composite anode having an under body of electrically conductive but anodically inert material that is covered by an outer layer of the electroplating metal of predetermined uniform thickness. The composite anode is positioned in close proximity to the surface of the metal object being electroplated with the facing surfaces of the anode and the metal object spaced a predetermined distance apart. The space between the anode and the metal object is filled with an aqueous electrolyte, and an electrolyzing current is passed through the electrolyte between the anode and the metal object to cause electroplating metal from the outer layer of the anode to be electrolytically dissolved in the electrolyte and to cause an exactly equal amount of the metal to be deposited on the facing surface of the metal object being electroplated. When all of the outer layer of electroplating metal has been removed from the surface of the anode, the electrode position of said metal onto the surface of the metal object will terminate, the resulting layer of metal on the surface of the metal object being of a predetermined uniform thickness throughout.

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