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

DOI: 10.1016/j.corsci.2015.06.023 DOI Help

Authors: Majid Ghahari (University of Birmingham) , Donal Krouse (Callaghan Innovation) , Nicholas Laycock (University of Birmingham) , Trevor Rayment (Diamond Light Source; University of Birmingham) , Cristiano Padovani (Nuclear Decommissioning Authority) , Marco Stampanoni (Paul Scherrer Institute) , Federica Marone (Paul Scherrer Institute) , Rajmund Mokso (Paul Scherrer Institute) , Alison Davenport (University of Birmingham)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Corrosion Science , VOL 100 , PAGES 23 - 35

State: Published (Approved)
Published: November 2015

Open Access Open Access

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.

Journal Keywords: Stainless steel; Pitting corrosion; Kinetic parameters; Galvanostatic; Potentiostatic; Electrochemical calculation

Subject Areas: Physics

Facility: SLS

Added On: 08/01/2016 12:50

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