Subject
Working electrodes, Electrochemical cells, Corrosion rate, Ohmic drop, Lead, Polarization curves, Experimental data, Polarization resistance, Active passive cells, Electrodes, Corrosion potential, Potentiodynamic polarization, Electrode potential

In a previous publication,1  it was shown that the uncompensated resistance RΩ, which contains contributions from the electrolyte resistance between the working electrode and the tip of the Luggin capillary, surface films, the bulk electrical resistance of the test electrode and its lead, etc., can cause erroneous polarization resistance measurements since the experimental value Rp’ is the sum of RΩ and the true polarization resistance Rpo⁠:

(1)

The relative experimental error:

(2)

equals the ratio RΩ/Rpo and can, therefore, have similar values in media of low conductivity and low corrosion rates and in media of good conductivity and high corrosion rates.

Mansfeld and Kendig2  have shown recently that...

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