The linear polarization method is widely used to monitor the corrosivity of industrial process streams and to measure the corrosion resistance of commercial and experimental alloys. Instruments to apply linear polarization employ probes with 2 electrode and 3 electrode configurations. The two have been compared on the basis of electrochemical kinetic theory, and errors which may arise in each are predicted. The 2 electrode method shows an extended range of linearity as compared to the 3 electrode method. However, the exact meaning of the 2 electrode measurement is difficult to define for many practical situations.

Subject
Electric current, Potential differences, Corrosion rate, Cathodic current, Deviation, Linear polarization, Polarization curves, Anodic current, Polarization, Tafel slope, Electrodes, Corrosion potential, Electrode potential
© 1976 National Association of Corrosion Engineers
1976
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