Characterization and corrosion behaviour of PEO coatings on AM50 magnesium alloy with incorporated particles

R. Arrabal, M. Mohedano, B. Mingo, E. Matykina, A. Pardo, M. C. Merino

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

    Abstract

    Composite ceramic coatings were formed on a magnesium alloy by AC plasma electrolytic oxidation (PEO) using a phosphate-based electrolyte with α-Al2O3, monoclinic ZrO2 or CeO2 particles in suspension. Effects of particle concentration (2, 5 and 10 g/L) on the composition/morphology and corrosion behaviour of the coatings were investigated. Findings revealed successful incorporation of particles, which were preferentially located in the outer coating layer. Due to high temperatures at the locations of microdischarges, zirconia particles underwent transformation from monoclinic to tetragonal structure. The majority of alumina and ceria particles remained unaffected, although some of the alumina particles could form MgAl2O4 by reaction with the substrate. Porosity and thickness of the coatings tended to decrease with increasing particle concentration in the electrolyte. Coatings formed in the electrolyte containing CeO2 particles revealed the highest corrosion resistance in 0.5% NaCI solution.

    Original languageEnglish
    Title of host publicationEuropean Corrosion Congress, EUROCORR 2015
    PublisherASMET Austrian Society for Metallurgy and Materials
    Pages1924-1933
    Number of pages10
    Volume3
    ISBN (Electronic)9781510837379
    Publication statusPublished - 1 Jan 2015
    EventEuropean Corrosion Congress, EUROCORR 2015 - Graz, Austria
    Duration: 6 Sept 201510 Sept 2015

    Conference

    ConferenceEuropean Corrosion Congress, EUROCORR 2015
    Country/TerritoryAustria
    CityGraz
    Period6/09/1510/09/15

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