Understanding the potentiodynamic critical pitting temperature

To better understand the potentiodynamic critical pitting temperature (CPT), the critical conditions of potential ( E) and temperature ( T) for repassivation of one-dimensional artificial pits at small depth ( x) were investigated. Apart from repassivation resulting from excessive dilution of the pit solution, repassivation underneath the salt film was also observed. The critical conditions for repassivation in ( E, T, x) space exhibit a complex functionality. The potentiodynamic-CPT should correspond to the lowest temperature of the critical ( E, T) conditions for repassivation of metastable pits, and it represents a critical temperature below which salt precipitation at any potential leads to repassivation of metastable pits.