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 journal › peer-review
Author(s)
Detail(s)
Original language | English |
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Pages (from-to) | 575-580 |
Journal / Publication | Transactions of Nonferrous Metals Society of China (English Edition) |
Volume | 19 |
Issue number | 3 |
Publication status | Published - Jun 2009 |
Link(s)
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 et al.
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 journal › peer-review