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Coatings 2017, 7(10), 154; doi:10.3390/coatings7100154

Biodegradable Mg/HA/TiO2 Nanocomposites Coated with MgO and Si/MgO for Orthopedic Applications: A Study on the Corrosion, Surface Characterization, and Biocompatability

1
Malaysia-Japan International Institute of Technology (MJIIT), Universiti Teknologi Malaysia (UTM), Kuala Lumpur 54100, Malaysia
2
Department of Materials, Manufacturing and Industrial Engineering, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia (UTM), Johor Bahru 81310, Malaysia
3
Medical Devices and Technology Group (MEDITEG), Faculty of Biosciences and Medical Engineering, Universiti Teknologi Malaysia (UTM), Johor Bahru 81310, Malaysia
4
Advanced Membrane Technology Research Center (AMTEC), Universiti Teknologi Malaysia (UTM), Johor Bahru 81310, Malaysia
5
Faculty of Chemical Engineering, Universiti Teknologi Malaysia (UTM), Johor Bahru 81310, Malaysia
6
School of Engineering and Technology, Central Michigan University, Mount Pleasant, MI 48859, USA
*
Authors to whom correspondence should be addressed.
Received: 28 August 2017 / Revised: 13 September 2017 / Accepted: 16 September 2017 / Published: 26 September 2017
(This article belongs to the Special Issue Coatings for Corrosion Mitigation)
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Abstract

In the field of orthopedics, magnesium (Mg) and magnesium-based composites as biodegradable materials have attracted fundamental research. However, the medical applications of magnesium implants have been restricted owing to their poor corrosion resistance, especially in the physiological environment. To improve the corrosion resistance of Mg/HA/TiO2 nanocomposites, monolayer MgO and double-layer Si/MgO coatings were fabricated layer-by-layer on the surface of a nanocomposite using a powder metallurgy route. Then, coating thickness, surface morphology, and chemical composition were determined, and the corrosion behavior of the uncoated and coated samples was evaluated. Field-emission scanning electron microscopy (FE-SEM) micrographs show that an inner MgO layer with a porous microstructure and thickness of around 34 μm is generated on the Mg/HA/TiO2 nanocomposite substrate, and that the outer Si layer thickness is obtained at around 23 μm for the double-layered coated sample. Electrochemical corrosion tests and immersion corrosion tests were carried out on the uncoated and coated samples and the Si/MgO-coated nanocomposite showed significantly improved corrosion resistance compared with uncoated Mg/HA/TiO2 in simulated body fluid (SBF). Corrosion products comprising Mg(OH)2, HA, Ca3(PO4)2, and amorphous CaP components were precipitated on the immersed samples. Improved cytocompatibility was observed with coating as the cell viability ranged from 73% in uncoated to 88% for Si/MgO-coated Mg/HA/TiO2 nanocomposite after nine days of incubation. View Full-Text
Keywords: Mg/HA/TiO2 nanocomposite; biodegradation behavior; Si/MgO; corrosion products; cytocompatibility Mg/HA/TiO2 nanocomposite; biodegradation behavior; Si/MgO; corrosion products; cytocompatibility
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MDPI and ACS Style

Zamani Khalajabadi, S.; Haji Abu, A.B.; Ahmad, N.; Kadir, M.R.A.; Ismail, A.F.; Nasiri, R.; Haider, W.; Redzuan, N.B.H. Biodegradable Mg/HA/TiO2 Nanocomposites Coated with MgO and Si/MgO for Orthopedic Applications: A Study on the Corrosion, Surface Characterization, and Biocompatability. Coatings 2017, 7, 154.

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