The operation of the vibrating electrode measuring the current densities or field in solution, has been described based on the use of a lock-in amplifier. The analysis was developed to quantify the effects of a non-uniform field. This was achieved by considering the changes in lock-in amplifier output on increasing the ratio of the vibration amplitude to the distance of the vibrating electrode from a point current source. The results have shown that significant deviations from the true field occur when the ratio is greater than 0.3 and become 4 times too large at a ratio of about 0.95.

Subject
Electric current, Voltage, Metal surfaces, Probes, Electrochemical noise, Impedance, Waves, Anode surfaces, Oscillation, Current densities, Cathodic current density, Vibration, Electrodes
Keywords:
current density mapping, non-uniform fields, point current source, vibrating electrode
National Association of Corrosion Engineers
1990
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