Characterization and wear behaviour of PEO coatings on 6082-T6 aluminium alloy with incorporated α-Al2O3 particles

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

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Plasma electrolytic oxidation (PEO) coatings with incorporated α-Al2O3 particles were formed on 6082-T6 alloy. Effects of particle concentration on phase composition and wear behaviour were investigated. Tribological performance was compared with that of electrolytic hard chrome. Results suggested that α-Al2O3 particles are incorporated into the outer layer of the coatings either by deposition, electrophoresis or mechanical entrapment by the material ejected from the discharge channels. As a result, the outer layer shows lower porosity and increased hardness. Friction coefficients of untreated 6082-T6 alloy and hard chrome coating remained relatively unaffected as the normal load increased from 2 to 10N. Friction coefficients of PEO coatings slightly increased with the applied load and were similar or slightly higher than those of hard chrome. PEO coatings with incorporated α-Al2O3 particles showed the lowest wear volumes among all tested materials, suggesting that they could be a promising alternative to hard chrome coatings.

    Original languageEnglish
    Pages (from-to)64-73
    Number of pages10
    JournalSurface and Coatings Technology
    Volume269
    Issue number1
    DOIs
    Publication statusPublished - 1 Jan 2015

    Keywords

    • Alumina
    • Aluminium
    • Anodizing
    • Hard chrome
    • Wear

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