Method for the electrolytic polishing of the inside surface holl

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

1974-02-28

1977-03-29

Edmundson, F. C.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

2041296, 2041297, 204212, 204215, C25F 330, C25F 700

Patent

active

040147657

ABSTRACT:
A method for electrolytically polishing the inside surface of hollow niobium bodies in which the niobium body acting as an anode is partially 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 polishing 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 stopped during the subsequent dissolution of the oxide layer and then a further rotation carried to immerse parts which have not been previously polished after which the steps are repeated.

REFERENCES:
patent: 2861937 (1958-11-01), Jumer
patent: 3616341 (1971-10-01), Jumer
patent: 3689388 (1972-09-01), Diepers et al.

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