Material Factors Affecting the Susceptibility to Intergranular Corrosion of Alloy 600 in the Transpassive Corrosion Potential Region

Abstract

In the present study, it has been reported on metallurgical factors like C, P, Cr contents and sensitization temperatures which affect the susceptibility to intergranular corrosion (IGC) of Alloy 600 in the transpassive corrosion potential region above 1200mV_SHE. The Cr depleted zone at grain boundaries (GB) in Alloy 600 was found to cause no IGC, as was in stainless steels. On the other hand, Ni-P compound precipitated at GB caused a remarkable increase of IGC susceptibility in Alloy 600, as was in stainless steels.
Moreover, Cr carbide precipitated at GB was found to increase IGC susceptibility due to the Ni-P compound in Alloy 600. On the contrary, it was found to decrease that in stainless steels.