Abstract
Constant potential polarization curves were obtained on steel rotating disk anodes in concentrated and electrolytes, and steady‐state polarization curves were obtained on stationary soft iron anodes in , , , and solutions. The results show that the metal removal reaction is activation controlled and that electrolytes are reduced to with extended periods of electrochemical machining. Tests conducted in a flow system showed that up to 50 g/l of could be tolerated in a concentrated electrolyte (350 g/l) before the excellent machining properties of the electrolyte become impaired. Wild cutting electrolytes do not form protective films on ferrous metals, whereas noncutting electrolytes form too highly protecting films of . The good dimensional control is obtained with electrolytes which behave in an intermediate way and possess a sharp transition from the passive to the transpassive state.
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