Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/18610
Title: Fabrication of bioactive titania coating on nitinol by plasma electrolytic oxidation
Authors: Siu, HT
Man, HC 
Keywords: Apatite
Corrosion
Nickel Titanium (NiTi)
Plasma Electrolytic Oxidation (PEO)
Titanium Oxide
Issue Date: 2013
Publisher: North-Holland
Source: Applied surface science, 2013, v. 274, p. 181-187 How to cite?
Journal: Applied surface science 
Abstract: Surface modification was attempted on Nitinol (NiTi) by plasma electrolytic oxidation (PEO) in aqueous solutions of sodium sulphate and sodium hydroxide (Na2SO4-NaOH) using an AC power supply. A thick and porous oxide layer with micron-sized pores was formed on the Nitinol substrate, with the thickness of the oxide layer ranging from a few μm to over 10 μm, depending on the processing time. X-ray diffraction (XRD) analysis confirmed that the oxide formed was anatase. Potentiodynamic polarization tests in Hanks' solution showed that the corrosion resistance of PEO-coated Nitinol was much higher than that of the substrate. More importantly, the apatite-forming ability of the PEO-treated NiTi was found to be enhanced. This could be attributed to the anatase crystalline structure of the titanium oxide and the porous structure that facilitates the anchorage of the hydroxyapatite particles.
URI: http://hdl.handle.net/10397/18610
ISSN: 0169-4332
EISSN: 1873-5584
DOI: 10.1016/j.apsusc.2013.03.008
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