Surface treatment of NiTi shape memory alloy by modified advanced oxidation process

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Cheng-lin CHU
  • Ru-meng WANG
  • Li-hong YIN
  • Yue-pu PU
  • Yin-sheng DONG
  • Chao GUO
  • Xiao-bo SHENG
  • Ping-hua LIN

Detail(s)

Original languageEnglish
Pages (from-to)575-580
Journal / PublicationTransactions of Nonferrous Metals Society of China (English Edition)
Volume19
Issue number3
Publication statusPublished - Jun 2009

Abstract

A modified advanced oxidation process(AOP) utilizing a UV/electrochemically-generated peroxide system was used to fabricate titania films on chemically polished NiTi shape memory alloy(SMA). The microstructure and biomedical properties of the film were characterized by scanning electron microscopy(SEM), X-ray photoelectron spectroscopy(XPS), inductively-coupled plasma mass spectrometry(ICPMS), hemolysis analysis, and blood platelet adhesion test. It is found that the modified AOP has a high processing effectiveness and can result in the formation of a dense titania film with a Ni-free zone near its top surface. In comparison, Ni can still be detected on the outer NiTi surface by the conventional AOP using the UV/H2O2 system. The depth profiles of O, Ni, Ti show that the film possesses a smooth graded interface structure next to the NiTi substrate and this structure enhances the mechanical stability of titania film. The titania film can dramatically reduce toxic Ni ion release and also improve the hemolysis resistance and thromboresistance of biomedical NiTi SMA. © 2009 The Nonferrous Metals Society of China.

Research Area(s)

  • advanced oxidation process(AOP), biomedical properties, NiTi shape memory alloy, titania film

Citation Format(s)

Surface treatment of NiTi shape memory alloy by modified advanced oxidation process. / CHU, Cheng-lin; WANG, Ru-meng; YIN, Li-hong; PU, Yue-pu; DONG, Yin-sheng; GUO, Chao; SHENG, Xiao-bo; LIN, Ping-hua; CHU, Paul-K.

In: Transactions of Nonferrous Metals Society of China (English Edition), Vol. 19, No. 3, 06.2009, p. 575-580.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review