Evaluating the Use of Phosphate to Mitigate Caustic-PbSCC of Alloy 690TT

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

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Phosphate additions to Pb-caustic water chemistry were investigated as possible avenue to mitigate against caustic Lead-Assisted Stress Corrosion Cracking (PbSCC) of Alloy 690TT at around 310°C. Dosing with 1,700 ppm of phosphate promoted a small beneficial effect in PbSCC resistance. However, with 3,000 ppm of phosphate, mitigation was only achieved for as received surfaces, whilst polished surfaces displayed localized attack. Advanced materials characterization revealed that a similar crack tip composition was generated in different solutions. It is suggested that phosphate decreased the PbSCC kinetics by partly sequestering Pb from the bulk environment, although not below the threshold value required to prevent cracking.
Original languageEnglish
Title of host publicationThe 20th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactor
Publication statusAccepted/In press - 1 Jul 2022
EventThe 20th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactor - , United States
Duration: 17 Jul 202221 Jul 2022

Conference

ConferenceThe 20th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactor
Country/TerritoryUnited States
Period17/07/2221/07/22

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