Chinese Journal of Tissue Engineering Research ›› 2011, Vol. 15 ›› Issue (3): 461-464.doi: 10.3969/j.issn.1673-8225.2011.03.020

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In vitro corrosion behavior of nano-multilayered TiN/Ti coated NiTi alloy

Shao An-liang1,2, Cheng Yan2,3, Xi Ting-fei1,2,3, Zhou Yi3, Zhou Liang1, Wan Zi-yi3   

  1. 1School of Information & Engineering, Wenzhou Medical College, Wenzhou  325035, Zhejiang Province, China
    2Biomedical Engineering Research Center, Shenzhen Institution of Peking University, Shenzhen  518057, Guangdong Province, China
    3Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing  100871, China
  • Received:2010-11-06 Revised:2010-12-29 Online:2011-01-15 Published:2011-01-15
  • Contact: Cheng Yan, Doctor, Associate researcher, Biomedical Engineering Research Center, Shenzhen Institution of Peking University, Shenzhen 518057, Guangdong Province, China; Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China chengyan@pku.edu.cn Correspondence to: Xi Ting-fei, Professor, School of Information & Engineering, Wenzhou Medical College, Wenzhou 325035, Zhejiang Province, China; Biomedical Engineering Research Center, Shenzhen Institution of Peking University, Shenzhen 518057, Guangdong Province, China; Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China xitingfei@pku.edu.cn
  • About author:Shao An-liang★, Studying for master’s degree, School of Information & Engineering, Wenzhou Medical College, Wenzhou 325035, Zhejiang Province, China; Biomedical Engineering Research Center, Shenzhen Institution of Peking University, Shenzhen 518057, Guangdong Province, China shaoanliang1984@hotmail.com
  • Supported by:

    the National Key Basic Research Program of China (973 Project), No. 2009CB930004*; the National Natural Science Foundation of China, No.30870623*

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Abstract:

BACKGROUND: A nickel-titanium alloy with super-elastic, shape memory effect and good fatigue resistance has become the optimal choice for the core component of occluder stent, but the nickel-titanium alloy containing 50% nickel has a controversial biocompatibility.
OBJECTIVE: To study anti-corrosion property of occluder nickel-titanium alloy before and after multi-arc ion plating by static immersion in vitro and electrochemical methods.
METHODS: Nano-gradient TiN/Ti multilayered films had been fabricated on nickel-titanium alloy by multi-arc ion plating. Nickel ion concentration was investigated by static immersion in PBS for one month. The anti-corrosion property of nickel-titanium alloy before and after surface modification was measured by open circuit potential-time curve and polarization curve.
RESULTS AND CONCLUSION: Nickel-titanium alloy had been released and reached the maximum values during one-month immersion period, while no nickel ion was found released from the TiN/Ti multilayered coated NiTi alloy. Open circuit potential-time curves and polarization curves show that the corrosion resistance of nickel-titanium alloy has been greatly improved after modification.

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