The double loop electrochemical potentiodynamic reactivation technique was developed to detect sensitization in wrought stainless steel. Because cast stainless steel has a different microstructure than wrought stainless steel, neither the double loop nor the single loop EPR technique has the selectivity required to detect sensitization. By using a modified double loop EPR technique in which the peak potential is raised to 450 mV vs. SCE, the sweep rate is slowed to 3 V/h, and the concentration is increased to 0.02M, sensitization can be detected in cast stainless steel.
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Reichert et al. (1990) studied this question.