Method for the electrolytic polishing of the inside surface...

Details Method for the electrolytic polishing of the inside surface... Method for the electrolytic polishing of the inside surface...

C - Chemistry, Metallurgy

25

F

204/84

C25F 3/22 (2006.01) C25F 3/26 (2006.01)

Patent

CA 1060378

Abstract of the Disclosure A method for electrolytically polishing the inside surface of hollow niobium bodies in which the niobium body acting as an anode is par- tially immersed in electrolyte and a voltage applied at a current causing oscillations to take place to cause polishing of the niobium body, after which the voltage is disconnected and the oxide layer generated during polish- ing dissolved. In accordance with the disclosed invention, during the application of the constant voltage, the hollow niobium body is slowly rotated about its axis of rotation at a speed so low that the development of the damped oscillations is not disturbed, with the rotation being stopped during the subsequent dissolution of the oxide layer and then a further rotation carried out to immerse parts which have not been previously polished after which the steps are repeated.

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