Photoelectron spectroscopy study of the inhibition of mild steel corrosion by molybdate and nitrite anions

A. A. Al-Refaie, J. Walton, R. A. Cottis, R. Lindsay

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Passive films formed on mild steel in aqueous 8.6 mM NaCl solutions (pH 8), containing either MoO42 - or NO2-, have been studied with X-ray photoelectron spectroscopy. For either anion these films are ∼5 nm deep, and the primary chemical state of iron is Fe3+. Following exposure to MoO42 -, the film consists of a sub-layer (∼4.1 nm) composed largely of ferric oxide/hydroxide, overlaid by Fe2(MoO4)3 (∼0.6 nm). As regards NO2-, spectra are consistent with the film being closely related to γ-Fe2O3. Furthermore, a reduction product of NO2-, potentially N2, is present, displaying a depth profile comparable to that of molybdate. © 2009 Elsevier Ltd. All rights reserved.
    Original languageEnglish
    Pages (from-to)422-428
    Number of pages6
    JournalCorrosion Science
    Volume52
    Issue number2
    DOIs
    Publication statusPublished - Feb 2010

    Keywords

    • A. Steel
    • B. XPS
    • C. Neutral inhibition
    • C. Passive films

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