XANES Study of the Chemistry of Molybdenum in Artificial Corrosion Pits in 316L Stainless Steel

Alison Davenport, AJ Dent, Mehdi Monir, Joshua Hammons, Seyed Ghahari, PD Quinn, T Rayment

Research output: Contribution to journalArticle

13 Citations (Scopus)

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 mu m 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. (C) 2011 The Electrochemical Society. [DOI: 10.1149/1.3559457] All rights reserved.
Original languageEnglish
Pages (from-to)C111-C117
JournalJournal of the Electrochemical Society
Volume158
Issue number5
DOIs
Publication statusPublished - 1 Jan 2011

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