Pitting corrosion of stainless steel: measuring and modelling pit propagation in support of damage prediction for radioactive waste containers

DOI: 10.1179/1743278211Y.0000000003

Authors: S. M. Ghahari (University of Birmingham) , D. P. Krouse (Industrial Research Limited) , N. J. Laycock (Quest Integrity Group) , T. Rayment (Diamond Light Source) , C. Padovani (Nuclear Decommissioning Authority) , T. Suter (Integrity EMPA) , R. Mokso (Swiss Light Source) , F. Marone (Swiss Light Source) , M. Stampanoni (Swiss Light Source) , M. Monir (University of Birmingham) , A. J. Davenport (University of Birmingham)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Corrosion Engineering, Science And Technology , VOL 46 (2) , PAGES 205-211

State: Published (Approved)
Published: April 2011

Abstract: In 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.

Journal Keywords: Stainless steels; Pitting; Radiography; Modelling; SynchrotronX-ray

Diamond Keywords: Alloys

Subject Areas: Chemistry, Engineering, Materials

Facility: TOMCAT at SLS

Added On: 05/05/2011 11:49

Discipline Tags:

Materials Engineering & Processes Physical Chemistry Chemistry Corrosion Materials Science Engineering & Technology Metallurgy

Technical Tags: