Abstract
A Fe-Zn bi-electrode coated with paint was exposed to NaCl solution, so that a well-defined galvanic cell was established with the current directly measured by a zero-resistance ammeter (ZRA). Electrochemical impedance spectroscopy (EIS) was periodically used to monitor coating behaviour for the two electrodes separately or coupled together. Potentiostatic current measurements were also made on each metal at different overpotentials to plot polarization curves. The ohmic potential drop in the paint was corrected using film resistance values determined by EIS. Evans diagrams were thus plotted from the corrected polarization curves to make a quantitative assessment of Mayne's resistance inhibition model.
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