Journal
MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
Volume 63, Issue -, Pages 192-197Publisher
ELSEVIER
DOI: 10.1016/j.msec.2016.02.066
Keywords
Surface; Corrosion resistance; Passive film; Electrochemical properties
Categories
Funding
- National Natural Science Foundation of China [91326203]
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The corrosion behaviors of NiTi shape memory alloy in NaCl solution, H2SO4 solution and borate buffer solution were investigated. It was found that TiO2 in passive film improved the corrosion resistance of NiTi shape memory. However, low corrosion resistance of passive film was observed in low pH value acidic solution due to TiO2 dissolution. Moreover, the corrosion resistance of NiTi shape memory alloy decreased with the increasing of passivated potential in the three solutions. The donor density in passive film increased with the increasing of passivated potential. Different solutions affect the semiconductor characteristics of the passive film. The reducing in the corrosion resistance was attributed to the more donor concentrations in passive film and thinner thickness of the passive film. (C) 2016 Elsevier B.V. All rights reserved.
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