Electrochemical behavior and effect of heat treatment on morphology, crystalline structure of self-organized TiO2 nanotube arrays on Ti–6Al–7Nb for biomedical applications

Mohan, L and Anandan, C and Rajendran, N (2015) Electrochemical behavior and effect of heat treatment on morphology, crystalline structure of self-organized TiO2 nanotube arrays on Ti–6Al–7Nb for biomedical applications. Materials Science and Engineering C, 50 . pp. 1-33.

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    Abstract

    In the present work, we investigate the formation of self-organized titanium oxide nanotube layers by anodic oxidation on titanium alloy Ti-6Al-7Nb in electrolyte solution containing sulfuric acid and hydrofluoric acid. The anodized surface was characterized by micro-Raman, X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and energy-dispersive X-ray spectroscopy (EDS). The corrosion behavior of the treated and untreated samples 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 nanoarray by anodization. FESEM of samples annealed at 450 to 800°C show tubular morphology whereas those annealed at 850°C show collapse of nanotubes. Electrochemical impedance data of the substrate and 10V anodized samples were fitted with a two-time constant equivalent circuit and that of anodized samples (20, 30V) with a three-time constant equivalent circuit.

    Item Type: Journal Article
    Additional Information: Copyright to this article belongs to M/s. Elsevier BV
    Uncontrolled Keywords: Anodic oxidation;TiO2 nanotubes;Corrosion;EIS;Nanotubes annealing
    Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
    Division/Department: Other , Surface Engineering Division, Other
    Depositing User: Ms. Alphones Mary
    Date Deposited: 09 Oct 2015 11:41
    Last Modified: 09 Oct 2015 11:41
    URI: http://nal-ir.nal.res.in/id/eprint/12377

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