Finite Difference Modeling to Study Pulsed Current Cathodic Protection’s Effect on Disbonded Coating Crevice Corrosion Mitigation: Waveform Effect

The effect of different waveforms on the performance of pulsed current cathodic protection in preventing crevice corrosion resulted from the creation of a holiday at the disbonded coating was investigated numerically. In order to achieve this goal, the oxygen concentration gradient, pH , sodium ion concentration gradient, potential distribution, and distribution of net current density were analyzed. The findings show that the ramp waveform is capable of reducing the oxygen concentration gradient along the crevice to the lowest possible level in comparison with other waveforms. Based on this, the oxygen concentration cell was moderated to the greatest level, and as a result, the potential gradient along the crevice was decreased to a greater extent compared to other waveforms.