Galvanic corrosion of rare earth modified AM50 and AZ91D magnesium alloys coupled to steel and aluminium alloys

Marta Mohedano, Raúl Arrabal*, Angel Pardo, Karín Paucar, M. Concepción Merino, Endzhe Matykina, Beatriz Mingo, Gerardo Garcés

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Electrochemical and gravimetric measurements were used to examine the effects of neodymium and gadolinium additions on the galvanic corrosion behaviour of AM50 and AZ91D magnesium alloys coupled to A 570 Gr 36 carbon steel and AA2011-AA6082 aluminium alloys. Rare earth modified alloys showed Al 2Nd/Al2Gd and Al-Mn-Nd/Al-Mn-Gd intermetallics, reduced area fraction of β-Mg17Al12 phase and increased corrosion resistance due to increased surface passivity and suppression of micro-galvanic couples. Neodymium and gadolinium additions improved the galvanic corrosion resistance of AM50 alloy, but were less effective in case of the AZ91D alloy. The AA6082 alloy was the most compatible material and the AA2011 alloy was the least compatible.

    Original languageEnglish
    JournalRevista de Metalurgia
    Volume50
    Issue number1
    DOIs
    Publication statusPublished - 1 Jan 2014

    Keywords

    • Galvanic corrosion
    • Magnesium alloys
    • Polarization
    • Weight loss

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