Journal
MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
Volume 32, Issue 4, Pages 851-857Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.msec.2012.02.002
Keywords
Zr-Nb alloys; Microstructure; Corrosion resistance; Surface; Cytotoxicity
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Funding
- National Basic Research Program of China (973 Program) [2012CB619102, 2012CB619101]
- Central University [HEUCFZ1017, HEUCFR1020]
- National High Technology Research and Development Program of China (863 Program) [2011AA030101, 2011AA030103]
- Natural Science Foundation of Heilongjiang Province [ZD201012]
- National Natural Science Foundation of China [51041004, 31170909]
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In this work, the effects of Nb content on microstructure and corrosion behaviors of biomedical Zr-Nb alloys were systematically studied. The results of XRD analysis and optical microscopy indicated that the experimental Zr-Nb alloys had a duplex structure of alpha and beta phases, and the content of beta phase increased with the increase of Nb content. The electrochemical impedance spectroscopy (EIS) studies showed an improvement on the resistance of the spontaneous oxide film with increasing Nb content. The EIS data, fitted by R-s(Q(p)R(p)) model, suggested a single passive film formed on the experimental material surfaces. Polarization tests in Hank's solution revealed a nobler electrochemical behavior of the Zr-Nb alloys after alloying Nb to pure Zr. The corrosion resistance increased with increasing Nb content, as indicated by lower corrosion current densities and passive current densities and higher pitting potentials. The major components on the surfaces of the corroded Zr-Nb alloy samples detected by XPS were ZrO2 and Nb2O5. The biocompatibility of Zr-Nb alloys was primarily evaluated by culturing L-929 cells in the extraction media of Zr-Nb alloy samples and excellent results were obtained. All of these above results suggested that the Zr-22Nb alloy, among the experimental alloys, showed a promising potential for biomedical applications. (c) 2012 Elsevier B.V. All rights reserved.
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