Journal
APPLIED SURFACE SCIENCE
Volume 463, Issue -, Pages 292-299Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2018.08.157
Keywords
RF magnetron sputtering; Hydroxyapatite; Ti-based alloys; Simulated body fluid; Electrochemical impedance spectroscopy
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Funding
- Ministry of Higher Education and Scientific Research of Iraq
- Engineering Faculty at Al Nahrain University
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Triple-layered RF magnetron sputtered HAp/Al2O3/TiO2 coatings synthesized onto Ti-6Al-4V alloys were studied to improve the surface biocompatibility and corrosion resistance features. It was seen that the HAp layers played a substantial role in the biocompatibility, while the intermediate Al2O3/TiO2 layers were used to enhance the corrosion behavior of the substrate. XRD results showed an enhanced crystallinity along with the (2 1 1) HAp phase after the simulated body fluid (SBF) immersion experiment. Local electronic and chemical bonding states of atomic phosphorus and calcium phosphate groups in the coatings, before and after immersion process, were confirmed via XPS studies. The electrochemical impedance spectroscopy (EIS) evaluated the corrosion, which indicated a reduction in capacitance values and a significant improvement of the corrosion resistance of such coatings; with improved bio-medical properties of Ti alloys.
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