OPTIMUM ELECTROLYTIC CHLORIDING OF SILVER ELECTRODES

The low frequency impedance of bare silver electrodes in contact with physiological saline was found to exhibit capacitive reactance and by the deposition of chloride the impedance became resistive in nature. It was found that a chloride deposit of 100-500 mA.sec/cm2 of electrode area provided the lowest electrode-electrolyte impedance. Prolongation of chloriding beyond this range increased the electrode-electrolyte impedance at all frequencies but did not alter the resistive nature of the impedance. To achieve a chloride deposit which is proportional to the product of mA and sec it was found that a minimum chloriding current density of 5 mA/cm2 of electrode area should be used. © 1969 International Federation for Medical and Biological Engineering.