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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 5    October 2007

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In situ synthesis of nanostructured titania film on NiTi shape memory alloy by Fenton’s oxidation method
CHU Cheng-lin(储成林)1, HU Tao(胡 涛)1, S. L. Wu2, WANG Ru-meng(王如萌)1, DONG Yin-sheng(董寅生)1, LIN Ping-hua(林萍华)1, C.Y. Chung2, P. K. Chu2

1. School of Materials Science and Engineering, Southeast University, Nanjing 211189, China;2. Department of Physics and Materials Science, City University of Hong Kong, Hong Kong, China

Abstract:Fenton’s oxidation method was successfully used to synthesize an ideal titania film in situ on NiTi shape memory alloy(SMA) for medical applications. Characterized with scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffractometry, inductively coupled plasma mass spectrometry and electrochemical tests, it is found that the titania film produced by Fenton’s oxidation method on NiTi SMA is nanostructured and has a Ni-free zone near its top surface, which results in a notable improvement in corrosion resistance and a remarkable decrease in leaching of harmful Ni ions from NiTi SMA in simulated body fluids. The improvement of effectiveness to corrosion resistance and the reduction in Ni release of NiTi SMA by Fenton’s oxidation method are comparable to those by oxygen plasma immersion ion implantation reported earlier.

 

Key words: NiTi shape memory alloy(SMA); Fenton’s oxidation; thin films; corrosion

ISSN 1672-7029
CN 43-1423/U

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