Thin nanocrystalline amorphous NiTi film was deposited on Si substrate using DC magnetron sputtering. The as-deposited NiTi thin film was crystallized by heat treatment at 500 degrees C for 1h. The crystal structure, surface morphology, microstructure and surface chemistry of the deposited films were studied using X-ray diffraction, atomic force microscopy, scanning electron microscopy and X-ray photoelectron spectroscopy (XPS), respectively. Corrosion behaviour was assessed in Ringer's solution at 37 degrees C by open circuit potential (OCP), potentiodynamic polarization and electrochemical impedance spectroscopy as a function of exposure time. OCP values indicate that the tendency for the formation of a spontaneous oxide film is greater for the NiTi thin films than the bulk NiTi. Long time exposure to Ringer's solution was found to have a great effect on the corrosion behaviour of the samples. Significantly low corrosion current density was obtained for the annealed NiTi film from the potentiodynamic polarization curves indicating a typical passive behaviour, but as-deposited film and bulk NiTi alloy exhibited breakdown of passivity at potentials approximately +1.4V (vs. SCE). XPS showed that the oxide film formed on the annealed NiTi thin film mainly composed of Ti oxides, and no evidence of Ni was found up to 8.2nm beneath the top surface, suggesting the excellent corrosion resistance of this sample in Ringer's solution.
机构:Hong Kong Polytech Univ, Dept Appl Phys, Kowloon, Hong Kong, Peoples R China
Chiu, K. Y.
;
Wong, M. H.
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机构:Hong Kong Polytech Univ, Dept Appl Phys, Kowloon, Hong Kong, Peoples R China
Wong, M. H.
;
Cheng, F. T.
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Hong Kong Polytech Univ, Dept Appl Phys, Kowloon, Hong Kong, Peoples R ChinaHong Kong Polytech Univ, Dept Appl Phys, Kowloon, Hong Kong, Peoples R China
Cheng, F. T.
;
Man, H. C.
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机构:Hong Kong Polytech Univ, Dept Appl Phys, Kowloon, Hong Kong, Peoples R China
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Univ Birmingham, Dept Met & Mat, Birmingham B15 2TT, W Midlands, EnglandUniv Birmingham, Dept Met & Mat, Birmingham B15 2TT, W Midlands, England
Dong, H.
;
Ju, X.
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Univ Birmingham, Dept Met & Mat, Birmingham B15 2TT, W Midlands, EnglandUniv Birmingham, Dept Met & Mat, Birmingham B15 2TT, W Midlands, England
Ju, X.
;
Yang, H.
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SW Jiaotong Univ, Tribol Res Inst, Natl Tract Power Lab, Chengdu 610031, Peoples R ChinaUniv Birmingham, Dept Met & Mat, Birmingham B15 2TT, W Midlands, England
Yang, H.
;
Qian, L.
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SW Jiaotong Univ, Tribol Res Inst, Natl Tract Power Lab, Chengdu 610031, Peoples R ChinaUniv Birmingham, Dept Met & Mat, Birmingham B15 2TT, W Midlands, England
Qian, L.
;
Zhou, Z.
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SW Jiaotong Univ, Tribol Res Inst, Natl Tract Power Lab, Chengdu 610031, Peoples R ChinaUniv Birmingham, Dept Met & Mat, Birmingham B15 2TT, W Midlands, England
机构:Hong Kong Polytech Univ, Dept Appl Phys, Kowloon, Hong Kong, Peoples R China
Chiu, K. Y.
;
Wong, M. H.
论文数: 0引用数: 0
h-index: 0
机构:Hong Kong Polytech Univ, Dept Appl Phys, Kowloon, Hong Kong, Peoples R China
Wong, M. H.
;
Cheng, F. T.
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h-index: 0
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Hong Kong Polytech Univ, Dept Appl Phys, Kowloon, Hong Kong, Peoples R ChinaHong Kong Polytech Univ, Dept Appl Phys, Kowloon, Hong Kong, Peoples R China
Cheng, F. T.
;
Man, H. C.
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h-index: 0
机构:Hong Kong Polytech Univ, Dept Appl Phys, Kowloon, Hong Kong, Peoples R China
机构:
Univ Birmingham, Dept Met & Mat, Birmingham B15 2TT, W Midlands, EnglandUniv Birmingham, Dept Met & Mat, Birmingham B15 2TT, W Midlands, England
Dong, H.
;
Ju, X.
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h-index: 0
机构:
Univ Birmingham, Dept Met & Mat, Birmingham B15 2TT, W Midlands, EnglandUniv Birmingham, Dept Met & Mat, Birmingham B15 2TT, W Midlands, England
Ju, X.
;
Yang, H.
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h-index: 0
机构:
SW Jiaotong Univ, Tribol Res Inst, Natl Tract Power Lab, Chengdu 610031, Peoples R ChinaUniv Birmingham, Dept Met & Mat, Birmingham B15 2TT, W Midlands, England
Yang, H.
;
Qian, L.
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h-index: 0
机构:
SW Jiaotong Univ, Tribol Res Inst, Natl Tract Power Lab, Chengdu 610031, Peoples R ChinaUniv Birmingham, Dept Met & Mat, Birmingham B15 2TT, W Midlands, England
Qian, L.
;
Zhou, Z.
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h-index: 0
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SW Jiaotong Univ, Tribol Res Inst, Natl Tract Power Lab, Chengdu 610031, Peoples R ChinaUniv Birmingham, Dept Met & Mat, Birmingham B15 2TT, W Midlands, England