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Mechanistic studies of atmospheric pitting corrosion of stainless steel for ILW containers

DOI: 10.1179/1743278214Y.0000000183 DOI Help

Authors: Alison Davenport (University of Birmingham) , Liya Guo (University of Birmingham) , N. Mi (University of Birmingham) , H. Mohammed-ali (University of Birmingham) , M. Ghahari (University of Birmingham) , Steven Street (University of Birmingham) , N. J. Laycock (University of Birmingham) , Trevor Rayment (Diamond Light Source) , Christina Reinhard (Diamond Light Source) , C. Padovani (Radioactive Waste Management Limited, formerly Nuclear Decommissioning Authority Radioactive Waste Management Directorate) , D. Krouse (Callaghan Innovation, PO Box 31-310, Lower Hutt, Wellington)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Corrosion Engineering, Science and Technology , VOL 49 (6 ) , PAGES 514-250

State: Published (Approved)
Published: June 2014
Diamond Proposal Number(s): 7412 , 8334

Abstract: Atmospheric pitting corrosion of stainless steel was examined with synchrotron X-ray microtomography, laboratory based tests and electrochemical measurements in order to provide a mechanistic basis for the development of corrosion prediction models. It was found that the morphology of corrosion pits was affected by the presence of residual ferrite, and some pits showed dense covers that may affect pit stability. Fluctuations in relative humidity may lead to partial or complete repassivation of pits, sometimes leading to the formation of new pits. Electrochemical measurements in artificial pits containing concentrated salt solutions show a strong dependence of the diffusion limited current density on chloride concentration.

Journal Keywords: Atmospheric Pitting Corrosion; Stainless Steel; X-Ray Microtomography

Subject Areas: Materials

Instruments: I12-JEEP: Joint Engineering, Environmental and Processing