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XANES study of the chemistry of molybdenum in artificial corrosion pits in 316L stainless steel

DOI: 10.1149/1.3559457 DOI Help

Authors: Alison J. Davenport (University of Birmingham) , Andrew J. Dent (Diamond Light Source) , Mehdi Monir (University of Birmingham) , Joshua A. Hammons (University of Birmingham) , S. Majid Ghahari (University of Birmingham) , Paul D. Quinn (Diamond Light Source) , Trevor Rayment (Diamond Light Source; University of Birmingham)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of The Electrochemical Society , VOL 158 (5) , PAGES C111-C117

State: Published (Approved)
Published: January 2011

Abstract: The chemistry of molybdenum species in artificial corrosion pits on 316L stainless steel was investigated using X-ray absorption spectroscopy (XANES). It was found that the K-edge spectra are consistent with the presence of an Mo(III) species. The presence of Mo(VI) polymolybdates as been proposed to explain the well-known beneficial effects of Mo in decreasing the susceptibility of stainless steel to localised corrosion, but no evidence of these species was found. High resolution measurements (with a spatial resolution of 3.5 μm in the vertical direction) through the dissolving metal interface did not detect the presence of any different Mo-containing species in the vicinity of the salt film. However, the spatial resolution was insufficient to detect the presence of submonolayer species on the dissolving metal surface that have been proposed to block active dissolution.

Journal Keywords: Corrosion; Molybdenum; Monolayers; Xanes

Diamond Keywords: Alloys

Subject Areas: Chemistry, Engineering, Materials

Instruments: B16-Test Beamline , I18-Microfocus Spectroscopy

Added On: 05/05/2011 11:37

Discipline Tags:

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

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS) X-ray Absorption Near Edge Structure (XANES)