Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1977-09-01
1978-11-28
Edmundson, F.C.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
2041291, 204206, C25F 316, C25F 700
Patent
active
041274598
ABSTRACT:
An apparatus and method for using same are disclosed for electro-polishing large flat or slightly curved surfaces on metal objects. The apparatus includes a shallow structure for electro-polishing flat horizontal surfaces, and a thin deep structure for electro-polishing vertical surfaces. The structure may be a tank having a liquid bath therein for immersing therein the metal object to be electro-polished. If the object is too large to be immersed in a separate tank, a temporary liquid bath containing structure is built on and around the object such that the surface to be electro-polished forms a boundary of the liquid containing structure. In either embodiment, a movable electrode (cathode) is depended from the sides of the structure and includes an active portion thereof which is positioned parallel to and spatially related from at least a portion of the surface to be electro-polished. In the method, the object is given a positive electric charge, the cathode (ungrounded) is given a negative charge, and as a portion of the surface is electro-polished, the cathode is moved, either continuously or discreetly, across the entire surface on which polishing is desired.
REFERENCES:
patent: 2172158 (1939-09-01), Brislee et al.
patent: 2861937 (1958-11-01), Jumer
patent: 3857764 (1974-12-01), Jumer
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