Critical Pitting Temperature of a 22-05 Duplex Stainless Steel and Pitting Potential Statistics

摘要

The Critical Pitting Temperature of a 22-05 type duplex stainless is investigated using both potentiodynamic and potentiostatic techniques. The potentiodynamic technique leads to a lower CPT value than the potentiostatic one. The pitting potential distribution near the CPT is determined using a multichannel device. A 10℃ transition temperature interval is evidenced in which pitting probability gradually increases from 0 to 1. A conservative CPT should then be defined as the lowest boundary of this temperature interval.