Sparking at cathode tools during electrochemical machining in flow-through cells

The current density used in electrochemical machining can be increased only up to a certain value, above which the formation of electric sparks on the cathode (tool) is observed, whereby the latter is damaged and the anode surface becomes rough. The present work is devoted to the measurement of this...

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Bibliographic Details
Published in:Journal of applied electrochemistry 1994-08, Vol.24 (8), p.767-771
Main Authors: ROUSAR, I, RIEDEL, T
Format: Article
Language:English
Subjects:
Chemistry
Electrochemistry
Exact sciences and technology
General and physical chemistry
Kinetics and mechanism of reactions
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Summary:The current density used in electrochemical machining can be increased only up to a certain value, above which the formation of electric sparks on the cathode (tool) is observed, whereby the latter is damaged and the anode surface becomes rough. The present work is devoted to the measurement of this critical density for small metal cathodes placed on the wall of a flow-through channel for Reynolds numbers from 1265-5902 and static pressures from 0.1-1.0 MPa. The results are correlated by criterion equations which gave values of critical (sparking) cathodic current density, j sub s , with an average error of 7.1% for laminar flow and 4.1% for turbulent flow. The equations can be used for the calculation of the sparking current density for industrial flow-through cells for electrochemical machining.
ISSN:0021-891X
1572-8838
DOI:10.1007/BF00578092