Pitting corrosion mechanism of stainless steels under wet-dry exposure in chloride-containing environments

摘要: Abstract Two types of stainless steel were exposed to the alternate conditions 1 h immersion in chloride-containing solution and 7 drying at 30 °C 67% RH. The corrosion rates potentials monitored simultaneously continuously during exposure by using combined AC impedance potential monitoring techniques order study mechanism pitting steels under a marine atmospheric environment. results show that is initiated preferentially dry cycle after critical chloride concentration reached. Pit initiation followed shift about −400 mV (SSE) as growth commences. Afterwards, specimen surface dries up, repassivation commences, it may continue towards next wet if perfect within active pit not permitted. Furthermore, was found presence thin layers contributes enhancement growth. A proposed explain