AC INDUCED CORROSION - EFFECT OF AN ALTERNATING VOLTAGE ON ELECTRODES UNDER CHARGE-TRANSFER CONTROL

The equation relating current to voltage for an electrode under charge-transfer control was solved for a sinusoidal modulation of the electrode potential. The rectified Faradaic component was obtained, so as to derive its value as a function of the Tafel parameter and of the amplitude of the modulating voltage, as well as of average electrode potential. The case where one electrode reaction is under diffusion control also was treated. The implications of the obtained results on the corrosion due to AC leakage are examined.