Abstract
It is shown, both by theory and by experiment, that r.m.s. alternating current in excess of 70·7 per cent of direct current will give rise to a change in electrode reactions from monopolar to bipolar operating conditions. Under bipolar conditions, and at a frequency of 50 c/s, hydrogen is evolved which it is supposed interferes with the normal passive film present on platinum, and thus leads to increased corrosion. Knowledge of the conditions leading to the transition from monopolar to bipolar behaviour allows explanations to be advanced for the results described by several authors and covering a wide range of electrochemical reactions.
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