Pitting corrosion of rheocast A356 aluminium alloy in 3.5wt.% NaCl solution

R. Arrabal, B. Mingo, A. Pardo, M. Mohedano, E. Matykina, I. Rodríguez

    Research output: Contribution to journalArticlepeer-review


    In this study, the microstructure and corrosion behaviour of rheocast and gravity-cast A356 aluminium alloys were examined and compared. Scanning Kelvin probe force microscopy (SKPFM) results proved that large potential differences between iron-containing intermetallics and the α-Al matrix were responsible for the initiation of the attack at the intermetallics/α-Al interfaces. For longer immersion times, corrosion attack proceeded through the eutectic areas. Semisolid processing refined the eutectic silicon and iron-intermetallics and reduced the potential difference between secondary phases and the matrix. This resulted in improved pitting corrosion resistance of the rheocast A356 aluminium alloy.

    Original languageEnglish
    Pages (from-to)342-355
    Number of pages14
    JournalCorrosion Science
    Publication statusPublished - 1 Aug 2013


    • A. Aluminium
    • B. AFM
    • B. EIS
    • B. Polarisation
    • B. Weight loss
    • C. Pitting corrosion


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