Micro-arc oxidation coating on porous magnesium foam and its potential biomedical applications

J. M.Rúa, A. A. Zuleta, J. Ramírez, P. Fernández-Morales

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    29 Scopus citations

    Abstract

    In this study, we fabricated a biodegradable porous metal using the AZ31 Mg alloy substrate with anodic coating for application in bioimplant scaffolds. The cellular Mg alloy was obtained by employing replication processes that use NaCl as a space holder under a controlled atmosphere. Further, vacuum pressure was applied for achieving the infiltration. The Mg porous samples were coated by a micro-arc oxidation (MAO) technique using a phosphate/calcium electrolyte. Further, the samples were examined by atomic force microscopy (AFM), scanning electron microscopy (SEM), X-ray diffraction (XRD), compression tests and surface area measurements. The MAO technique allowed us to obtain a homogeneous coating layer of ~16.0 μm thickness with the surface across the foam structure comprising rounded pores with diameters of less than 3.0 μm. Ca, P, Mg and O are the main elements of the anodic coating. Furthermore, both the coated and uncoated porous samples exhibit similar values of approximately 1.5 GPa and 5.0 MPa for the Young's modulus and compressive strength, respectively.

    Original languageEnglish
    Pages (from-to)213-221
    Number of pages9
    JournalSurface and Coatings Technology
    Volume360
    DOIs
    StatePublished - 25 Feb 2019

    Bibliographical note

    Funding Information:
    The authors are grateful to “Centro de Investigación para el Desarrollo y la Innovación (CIDI)” from the Universidad Pontificia Bolivariana through UPB-Innova Rad: 635B-06/16-18 and Departamento Administrativo de Ciencia, Tecnología e Innovación (COLCIENCIAS) of the Colombian Government (Contract No. 392-2016 ). The authors also thank Prof. Zulamita Zapata Benabithe for collaboration in the DFT tests and analysis.

    Publisher Copyright:
    © 2019 Elsevier B.V.

    Keywords

    • Biodegradable Mg
    • Cancellous bone
    • Infiltration process
    • Inorganic coating
    • Magnesium foam
    • Micro-arc oxidation

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