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

Research output: Contribution to journalArticlepeer-review

Authors

  • L. Guo
  • N. Mi
  • N. J. Laycock
  • T. Rayment
  • C. Reinhard
  • C. Padovani
  • D. Krouse

External organisations

  • University of Birmingham
  • Diamond Light Source
  • Radioactive Waste Management Limited
  • Callaghan Innovation

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.

Details

Original languageEnglish
Pages (from-to)514-520
Number of pages7
JournalCorrosion Engineering Science and Technology
Volume49
Issue number6
Publication statusPublished - 3 Jun 2014

Keywords

  • Atmospheric pitting corrosion, Stainless steel, X-ray microtomography