C - Chemistry – Metallurgy – 25 – F
Patent
C - Chemistry, Metallurgy
25
F
204/84, 204/85.5
C25F 3/22 (2006.01) B01J 19/02 (2006.01) C25F 3/16 (2006.01)
Patent
CA 1127998
Abstract of the Disclosure An apparatus and method for electro-chemical treating or electro-polishing the interior surfaces of a domed end, including an access port extending therefrom, of a large cylindrical vessel. For electro-polishing, the apparatus includes a cathode rod unit which is fastened to a mounting flange on the access nozzle such that the cathode thereof extends through the length of the nozzle in spaced relation to its interior surface. The cathode rod is insulated from the nozzle by a dielectric mounting disc positioned on the rod perpendicularly thereto. The external end of the cathode rod unit includes an electrical terminal to which direct current may be applied during electro-polishing. The external electrical terminal mounting lessens the amount of apparatus required to be inside the vessel during electro-polishing. The method for electro polishing utilizes the cathode rod unit by mounting one of the same in each nozzle in one domed end before it is welded to a vessel body. The domed end is then stood upright and filled with an electro-polishing bath. An additional curved cathode is positioned in spatial relation to the dished interior surface of the do?ed end, and arranged for rotation to sweep across the entire dished surface. A direct electric current is passed between both cathodes and the vessel acting as an anode through the electro-polishing bath.. Since both the cathodes can be charged at the same time, as well as separately, the entire in- terior surfaces of the domed end may be polished together.
298215
Jumer John F.
Osler Hoskin & Harcourt Llp
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