Numerical Simulation of Correlation between Resistance Change and Corrosion Degree of Bar Resistance Probe

The resistance change of resistance probes with different sizes and corrosion defect types, and electrical resistance (ER) theory equivalent corrosion depth were calculated by numerical simulation method. Their correlation with the equivalent corrosion depth based on weight-loss method was studied. And the rationality of the numerical simulation model was verified with experiments. The results show that the resistance value of corrosion probe increased linearly with the increase of corrosion depth under uniform corrosion condition, and increased slowly with the increase of pitting coefficient, which indicated that ER probe could characterize uniform corrosion but was affected by localized corrosion. When the probe size and corrosion defect were constant, the relative deviation of the equivalent corrosion depths based on ER theory and weight loss method increased with the increase of pitting coefficient.