Effect of plasma electrolytic oxidation on joining of AA 5052 aluminium alloy to polypropylene using friction stir spot welding

S. Aliasghari, M. Ghorbani, P. Skeldon, H. Karami, M. Movahedi

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    Abstract

    The effect of a plasma electrolytic oxidation (PEO) pre-treatment on joining of AA 5052 aluminium alloy and polypropylene by friction stir spot welding (FSSW) is investigated using lap tensile shear tests. Two surface conditions of the AA 5052 alloy are compared, one with a PEO pre-treatment in a silicate-based electrolyte, another without any pre-treatment. The resultant specimens are examined by high resolution scanning electron microscopy, thermogravimetric analysis and attenuated total reflectance-infrared spectroscopy. The PEO treatment generated a thermally-insulating, porous ceramic coating, which has a highly porous, rough surface that is favourable for incorporating polypropylene melted by FSSW. The pre-treatment significantly increased the lap tensile shear strength, by about a factor of three, in comparison with the untreated alloy, suggesting that open pores in the coating filled by polypropylene provide strong micromechanical interlocking and covalent bonding between the coated alloy and the polymer.

    Original languageEnglish
    Pages (from-to)274-281
    Number of pages8
    JournalSurface and Coatings Technology
    Volume313
    Early online date28 Jan 2017
    DOIs
    Publication statusPublished - 15 Mar 2017

    Keywords

    • Alloy
    • Aluminium
    • Friction stir spot welding
    • Plasma electrolytic oxidation
    • Polypropylene

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