Measurement of the Throwing Power of Electrolytes Used in Electrochemical Machining

A method of measuring the throwing power of solutions under conditions pertinent to electrochemical machining has been developed, based on the Haring‐Blum cell. Results on solutions of sodium chloride and sodium chlorate show that the latter has a lower throwing power under the present conditions in agreement with previously reported data. Additions of 0.12% potassium dichromate and of 1% benztriazole to sodium chloride solutions reduced the throwing power to values comparable to those of the chlorate solutions. The results are discussed in terms of passivation effects.