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    Development of hybrid hierarchical coatings on Mg3Zn0.4Ca alloy for orthopaedic implants

    Year: 2023

    Journal: Journal of Materials Research and Technology, Volume 24, 2023-05-01

    Authors: Moreno, Lara; Mohedano, Marta; Arrabal, Raúl; Rodríguez-Hernández, Juan; Matykina, Endzhe

    Keywords: Biodegradable; Polymer; Hybrid coatings; Magnesium; Microporous surface; Plasma electrolytic oxidation

    A hybrid hierarchical coating (HHC) biodegradable system, consisting of a ceramic (PEO) and a biodegradable microporous polymeric (PLA or PCL) layers, was developed on Mg3Zn0.4Ca alloy and evaluated under quasi-in vivo conditions. The polymer top-coat was produced using the Breath Figures approach by dip-coating the PEO treated ceramic surface onto a PLA/PCL polymer solution and withdraw under high relative humidity. According to our findings, when the polymer coating is applied directly onto the PEO layer using high humidity a negligible corrosion protection was observed. However, this issue was overcome by first applying a thin sealing polymer layer before the microporous polymer layer prepared by dip-coating in the absence of moisture. The HHC system improves the corrosion resistance by 10–12 times compared to the stand-alone PEO coating and, due to its inherent porosity, should be amenable for further functionalization with pharmaceutical agents.
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