Effect of plasma nitriding on structure and biocompatibility of self organised TiO2 nanotubes on Ti-6Al-7Nb

Mohan, L and Anandan, C and Rajendran, N (2015) Effect of plasma nitriding on structure and biocompatibility of self organised TiO2 nanotubes on Ti-6Al-7Nb. RSC Advances, 5. pp. 41763-41771.

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Official URL: http://dx.doi.org/10.1039/C5RA05818J

Abstract

TiO2 nanotubes formed by anodic oxidation of Ti-6Al-7Nb were nitrided in a nitrogen plasma. The samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Nano hardness tester (NHT) and Field emission scanning electron microscopy (FESEM). The corrosion behaviour of the substrate, plasma nitrided substrate, substrate with self organised TiO2 nano tubes (TNT) and with plasma nitrided TiO2 nano tubes (TNT+PN) was investigated through electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization studies in simulated body fluid (Hanks’ solution). The investigations show that the native oxide on the sample is replaced by self assembled nano array by anodisation process. XPS spectra of TNT plasma nitrided sample show the presence of oxy nitride and nitride on the surface. Nano hardness of the samples has increased after nitriding. FESEM images of samples immersed in Hanks’ solution show that growth of calcium phosphate phases is more and the size of deposits are larger on TNT and nitrided TNT samples, as compared to that on the untreated substrate. XPS spectra of TNT and nitrided TNT samples immersed in Hanks’ solution show higher amount of calcium, phosphorous and oxygen than on the substrate. Electrochemical studies show that nitriding decreases the corrosion resistance.

Item Type: Article
Additional Information: Copyright to this article belongs to M/s. Royal Society of Chemistry
Uncontrolled Keywords: Anodic oxidation;Nanotubes;Nitriding;Corrosion;EIS
Subjects: AERONAUTICS > Aeronautics (General)
Depositing User: Ms. Alphones Mary
Date Deposited: 15 Apr 2016 04:57
Last Modified: 15 Apr 2016 04:57
URI: http://nal-ir.nal.res.in/id/eprint/12425

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