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TitlePitting corrosion of stainless steel: Measuring and modelling pit propagation in support of damage prediction for radioactive waste containers
Publication TypeJournal Article
Year of Publication2011
AuthorsGhahari, S.M., Krouse D.P., Laycock N.J., Rayment T., Padovani C., Suter T., Mokso R., Marone F., Stampanoni M., Monir M., and Davenport A.J.
JournalCorrosion Engineering Science and Technology
Pagination205 - 211
Date Published2011
ISSN1478422X (ISSN)
KeywordsCharge neutrality, Chloride solutions, Chlorine compounds, Corrosion resistant alloys, Crack propagation, Damage prediction, Electrochemical control, Finite element method, Finite element models, In-situ synchrotrons, Interfacial potential, Local current density, Metal ion concentration, Metal ions, Modelling, Pit propagation, Pitting, Pitting corrosion, Potential drop, Quantitative comparison, Radioactive waste containers, Radioactive waste disposal, Radioactive wastes, Radiology, Solution composition, Stainless steel, Stainless steel foil, Steel containers, Synchrotrons, Transport equation, Two dimensional, X ray radiography
AbstractIn situ synchrotron radiography has been used to observe the evolution of two-dimensional pits growing in stainless steel foils under electrochemical control in chloride solutions. A method for extracting the key kinetic parameters from radiographs is under development to provide data for validating and calibrating a two-dimensional finite element model previously developed by Laycock and White. The local current density along the boundary of a pit is directly measured from the radiographs. Then, the local metal ion concentration and potential drop inside the pit cavity are backcalculated using transport equations and the requirement to maintain charge neutrality, giving the relationship between current density, solution composition and interfacial potential. Preliminary comparisons show qualitative correlation between the model and extracted data; quantitative comparison is under way. © 2011 Institute of Materials, Minerals and Mining.

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