Synchrotron X-ray radiography studies of pitting corrosion of stainless steel: Extraction of pit propagation parameters

Research output: Contribution to journalArticlepeer-review

Authors

  • Donal Krouse
  • Nicholas Laycock
  • Cristiano Padovani
  • Marco Stampanoni
  • Federica Marone
  • Rajmund Mokso

External organisations

  • Callaghan Innovation, PO Box 31310, Lower Hutt 5040
  • Swiss Light Source, Paul Scherrer Institute
  • Institute for Biomedical Engineering, University and ETH Zürich

Abstract

In situ synchrotron X-ray radiography was used to observe the evolution of 2D pits growing at the edge of stainless steel foils in chloride solutions of varying concentrations under current and potential control. A method was developed for measuring the local anodic current density along the perimeter of pits from the rate of advance of the pit into the metal. Pit depth tends to increase with time with kinetics consistent with diffusion control (under a salt layer), whereas lateral development (on film-free surfaces) is influenced by solution conductivity. Perforated covers formed on pits control their growth and stability.

Details

Original languageEnglish
Pages (from-to)23-35
JournalCorrosion Science
Volume100
Early online date21 Jul 2015
Publication statusPublished - 1 Nov 2015