Electro-plating process

C - Chemistry – Metallurgy – 25 – D

Patent

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C25D 5/08 (2006.01) C25D 5/00 (2006.01) C25D 7/04 (2006.01) C25D 7/06 (2006.01)

Patent

CA 2304551

An electrolytic process for metal-coating the surface of a workpiece of an electrically conductive material, which process comprises: i) providing an electrolytic cell with a cathode comprising the surface of the workpiece and an anode; ii) introducing an electrolyte comprising a aqueous solution containing one or more water soluble compounds of the metal or metals to be deposited into the zone created between the anode and the cathode in a manner such that the cathode is bathed but not immersed in the said electrolyte; and iii) applying a voltage between the anode and the cathode, characterized in that iv) an electrical plasma arc is maintained between the anode and cathode during the deposition of the metal-coating onto the surface of the cathode.

L'invention concerne un procédé d'électrodéposition, destiné à former un dépôt métallique sur la surface d'une pièce d'un corps électriquement conducteur. Ce procédé consiste: i) à doter une cellule électrolytique d'une anode et d'une cathode comprenant la surface de ladite pièce; ii) à introduire un électrolyte renfermant une solution aqueuse, laquelle contient un ou plusieurs composés hydrosolubles du métal ou des métaux destinés à être déposés sur la zone ménagée entre l'anode et la cathode, de manière à ce que cette dernière baigne mais ne soit pas totalement immergée dans ledit électrolyte; et iii) à appliquer une tension entre cette anode et cette cathode, de sorte que iv) un flambeau de plasma électrique soit maintenu entre cette anode et cette cathode pendant la formation du dépôt métallique sur la surface de ladite cathode.

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