Effect of iron content on the corrosion of pure magnesium: critical factor for iron tolerance limit

Lei Yang, Guangkun Liu , Liangong Ma, Erlin Zhang, Xiaorong Zhou, George Thompson

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The present work investigates the corrosion behaviour of magnesium with different Fe contents. It is found that the micro-galvanic coupling between Fe-rich particles and magnesium matrix results in surface film formation and decrease in anodic reaction rate, consequently, increase of corrosion potential. Depending on the population density of Fe-rich particle, if the corrosion potential increases to the breakdown potential of surface film, localized corrosion initiates at the sites of breakdown. It is observed that Mg with different Fe contents exhibit the same critical potential value for corrosion initiation. Thus, corrosion potential is a critical factor for the corrosion tolerance limit of Fe in Mg.
    Original languageEnglish
    Pages (from-to)421-429
    JournalCorrosion Science
    Volume139
    Early online date21 Apr 2018
    DOIs
    Publication statusPublished - 15 Jul 2018

    Keywords

    • magnesium
    • iron
    • tolerance limit
    • corrosion potential
    • surface film breakdown

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