Abstract
Zirconium ion implantation was performed on NiTi alloy to suppress Ni ion release as well as to improve corrosion resistance and cell-material interaction. A thicker Ni-depleted nano-scale composite layer formed after Zr implantation and the corrosion resistance was evidently increased in aspects of increased E br − E corr (difference between corrosion potential and breakdown potential) and decreased corrosion current density. 2.5/2 NiTi sample possessed the highest E br − E corr, more than 500 mV higher than that of untreated NiTi, suggesting a significant improvement on pitting corrosion resistance. Ni ion release rate of Zr–NiTi was decreased due to the depletion of Ni in the superficial surface layer and the diffusion resistance effect of the ZrO2/TiO2 nano-film. Increased surface wettability induced by increased surface roughness was obtained after Zr implantation. Zr–NiTi samples were found to be favorable to endothelial cells (ECs) proliferation, especially after 5 and 7 days culture.
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Acknowledgments
This work is supported by National Natural Science Foundation of China (NSFC), No. 50971007 and 51171009. Yan Li acknowledges the Program for New Century Excellent Talents in University (NCET-09-0024).
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Zhao, T., Li, Y., Xia, Y. et al. Formation of a nano-pattering NiTi surface with Ni-depleted superficial layer to promote corrosion resistance and endothelial cell-material interaction. J Mater Sci: Mater Med 24, 105–114 (2013). https://doi.org/10.1007/s10856-012-4777-1
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DOI: https://doi.org/10.1007/s10856-012-4777-1