Centre Technique Des Industries Mecaniques

Charles Schepacz

Andre Roche

An electric current is passed through an electrolyte having a neutral pH, between an inert tool-electrode and the alloy which is to be machined to the shape of the tool-electrode. The electrolyte contains fluoride and/or fluoborate ions as well as complexing ions both for the carbide-phase metal or metals of the alloy and for the metallic-phase metal or metals of the alloy.

Method of electrochemical machining of polyphase alloys

A pulsating current comprising only positive half-waves separated by zero-current intervals is fed into an electrolyte between two electrodes in which the cathode is constituted by a tool and the anode is constituted by a part to be machined in accordance with the profile of the cathode. The electrolyte is of the passivating type which preferably contains between 30 and 50 grams per liter of sodium nitrate.

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Firminy, France

Charles Schepacz