Impact of molybdate and nitrite anions on the corrosion of mild steel

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

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    Abstract

    The effect of nitrite and molybdate anions on the corrosion of mild steel in aerated, near neutral 8.6x10-3 M (500 ppm) NaCl solution has been explored with weight loss, electrochemical, and optical microscopy techniques. Each moiety acts as an anodic inhibitor under these conditions, exhibiting a critical concentration for the onset of effective inhibition. Potentiodynamic polarization curve measurements indicate that both nitrite and molybdate act as passivating anodic inhibitors, and they appear to have little effect on the cathodic kinetics. Various binary mixtures of these anions were also examined, and a number exhibited effective inhibition. Furthermore, two mixtures were concluded to exhibit synergistic behaviour, as regards corrosion inhibition.
    Original languageEnglish
    Title of host publicationCorrosion Conference and Expo. 2009
    PublisherNACE International
    Publication statusPublished - 2009
    EventCorrosion 2009 - Atlanta, Georgia, USA
    Duration: 22 Mar 200926 Mar 2009

    Conference

    ConferenceCorrosion 2009
    CityAtlanta, Georgia, USA
    Period22/03/0926/03/09

    Keywords

    • mild steel
    • molybdate
    • nitrite
    • inhibition
    • synergism

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