Lead-Induced Stress Corrosion Cracking (PbSCC) initiation in Alloy 690TT in caustic environment

Giulia Mazzei, M. Grace Burke, D. A. Horner, Fabio Scenini

Research output: Contribution to journalArticlepeer-review


Pb-Caustic Stress Corrosion Cracking initiation was studied on Alloy 690TT at 315°C. Advanced electron microscopy techniques revealed that cracking mainly initiated intergranularly following the oxidation of Cr-rich grain boundary carbides. This finding explains the higher resistance to crack nucleation of the as-received surfaces compared to polished ones, because the grain boundaries of the ultrafine-grained near-surface layer were not decorated with carbides. It is also proposed that dislocation entanglements, typical of a cold-worked surface, attenuated the emission of dislocations at the surface. Once initiated, cracking continued due to Pb incorporation in the oxide, which weakened the passive layer and enhanced slip dissolution.
Original languageEnglish
Article number110475
JournalCorrosion Science
Early online date22 Jul 2022
Publication statusPublished - 1 Sep 2022


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