Abstract
Biodegradable Mg alloys have appeared as the most appealing metals for biomedical applications, particularly as temporary bone implants. However, issues regarding high corrosion rate and biocompatibility restrict their application. Hence, in the present work, nanostructured clinoenstatite (CLT, MgSiO3)/tantalum nitride (TaN) was deposited on the Mg-Ca-Zn alloy via electrophoretic deposition (EPD) along with physical vapor deposition (PVD) to improve the corrosion and biological characteristics of the Mg-Ca-Zn alloy. The TaN intermediate layer with bubble like morphology possessed a compact and homogenous structure with a thickness of about 950 nm while the thick CLT over-layer (~15 μm) displayed a less compact structure containing nano-porosities as well as nanoparticles with spherical morphology. The electrochemical tests demonstrated that the as prepared CLT/TaN film is able to substantially increase the anticorrosion property of Mg-Ca-Zn bare alloy. Cytocompatibility outcomes indicated that formation of CLT and TaN on the Mg bare alloy surface enhanced cell viability, proliferation and growth, implying excellent biocompatibility. Taken together, the CLT/TaN coating exhibits appropriate characteristic including anticorrosion property and biocompatibility in order to employ in biomedical files.
Highlights
Magnesium based-alloys have received a great deal of consideration as potential biodegradable materials for implants because of their excellent mechanical characteristics and biodegradability performance [1,2,3]
In the present research, CLT/tantalum nitride (TaN) coatings were prepared on Mg alloy using physical vapor deposition (PVD) followed by EDP methods to enhance the cytocompatibility and anticorrosion property of the substrate in order to develop orthopedic applications of Mg alloys
The CLT film was deposited through the electrophoretic deposition (EPD) procedure, associated with the standard cell along with a graphite rod and the TaN coated-Mg alloy as the anode and the cathode, respectively
Summary
Magnesium based-alloys have received a great deal of consideration as potential biodegradable materials for implants because of their excellent mechanical characteristics and biodegradability performance [1,2,3]. PVD, a thoroughly clean and eco-friendly approach, was appointed to create TaN as an under- layer with a dense structure to enhance corrosion resistance [16,17] In this context, porous Ta-based materials has been employed in orthopedic applications (total hip replacement) as a result of formation of a uniform, dense and cytocompatible of Ta2O5 film on their surface [18,19]. The presence of microcracks and micropores in the outer layer owing to the CLT film is typically porous, which may offer pathways for penetration of the SBF into the coating throughout corrosion process which reduce corrosion resistance of substrate. In the present research, CLT/TaN coatings were prepared on Mg alloy using PVD followed by EDP methods to enhance the cytocompatibility and anticorrosion property of the substrate in order to develop orthopedic applications of Mg alloys
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