Rokkala, U.Jana, A.Bontha, S.Ramesh, M.R.Balla, V.K.2026-02-052021Surface and Coatings Technology, 2021, 425, , pp. -2578972https://doi.org/10.1016/j.surfcoat.2021.127708https://idr.nitk.ac.in/handle/123456789/22995Magnesium based alloys are well-known materials for temporary implant applications. However, failures due to early degradation and bacterial infection are limiting their applications. To overcome these problems, in the present work a Mg-Zn-Dy alloy based composite surface was prepared using coating and friction stir processing (FSP) techniques. Herein, hydroxyapatite (HA) and silver (Ag) particles were deposited on Mg-Zn-Dy alloy to obtain HA and Ag coated surface (C-HAg). Later, FSP was carried out on the C-HAg surface to develop a Mg-Zn-Dy alloy based composite surface (F-HAg). Field emission scanning electron microscope (FESEM) and energy dispersive X-ray analysis (EDS) confirm the mixing of HA and Ag particles with the Mg-Zn-Dy substrate. Antibacterial studies reveal that both C-HAg and F-HAg samples inhibit Escherichia coli and Staphylococcus aureus bacteria. In vitro cytotoxicity study indicates that the both samples are non-toxic in nature. Results of in vitro corrosion study reveal a significant reduction (72%) in corrosion rate of F-HAg sample when compared to C-HAg sample. The F-HAg samples showed simultaneous improvement in corrosion resistance and antibacterial properties with good biocompatibility. The results of this study indicate that the developed composite surface is a promising material for antibacterial and biodegradable implant applications. © 2021 Elsevier B.V.BiocompatibilityCorrosion rateCorrosion resistanceCorrosion resistant alloysCorrosion resistant coatingsCorrosive effectsEnergy dispersive X ray analysisEscherichia coliFrictionFriction stir weldingHydroxyapatiteScanning electron microscopySilverTernary alloysX ray diffraction analysisZinc alloysAg particlesAnti-bacterial activityAnti-bacterial behaviorsBacterial infectionsBioactivesComposite surfaceCorrosion behaviourEarly degradationsFriction stir processingProcessing techniqueMagnesium alloys