Surface characteristics and electrochemical behaviour of sputter-deposited NiTi thin film

被引:12
作者
Saebnoori, E. [1 ]
Shahrabi, T. [2 ]
Sanjabi, S. [2 ]
Ghaffari, M. [3 ]
Barber, Z. H. [4 ]
机构
[1] Islamic Azad Univ, Najafabad Branch, Mat Engn Fac, Esfahan, Iran
[2] Tarbiat Modares Univ, Dept Mat Sci & Engn, Tehran, Iran
[3] Islamic Azad Univ, Najafabad Branch, Young Researchers & Elite Club, Najafabad, Iran
[4] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB2 3QZ, England
关键词
corrosion; Ringer's solution; NiTi thin film; XPS; magnetron sputtering; SHAPE-MEMORY ALLOY; CORROSION BEHAVIOR; MECHANICAL-PROPERTIES; OXIDE LAYER; RESISTANCE; OXIDATION; FABRICATION; XPS; EIS; ADSORPTION;
D O I
10.1080/14786435.2015.1043969
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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.
引用
收藏
页码:1696 / 1716
页数:21
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