Coupled multielectrode array sensors (MAS) may underestimate non-uniform corrosion rates in cases where the environment is not significantly corrosive because of possible internal electron flows on the most corroding electrode. An improved method was developed to derive the lower and upper bounding values for the non-uniform corrosion rate measured with the MAS probes. The lower boundary was measured when the electrodes of the MAS probe were at the natural coupling potential. The upper boundary was measured when the coupling potential of the MAS probe was raised to a value at which all electrodes are likely to be anodic. Under such raised coupling potential, possible internal electron flows within the most anodic electrode were stopped and their effects on the measured corrosion rate were eliminated.

Subject
Anode potential, Corrosion rate, Cathodic potential, Probes, Anodic electrodes, Cathodic current, Couplings, Cathodic sites, Anodic current, Corrosion probes, Electrodes, Corrosion potential, Electrode potential
Keywords:
Multielectrode sensor, multielectrode probe, corrosion monitoring, corrosion sensor, localized corrosion sensor, online corrosion sensor, real-time corrosion sensor, coupled multiple electrodes
Government work published by the Association for Materials Protection and Performance (AMPP) with permission of the author(s). Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2005
GOV
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