Surface structure and properties of biomedical NiTi shape memory alloy after Fenton’s oxidation

Chu, Chenglin; Hu, Tao; Wu, S. L.; Dong, Yong; Yin, Lihong; Pu, Yong; Peng, Lin; Chung, C.Y.; Yeung, K.W.K.; Chu, Paul K.

doi:10.1016/j.actbio.2007.03.002

Cited by 72 publications

(26 citation statements)

References 42 publications

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“…The dominant oxide in naturally passive layer formed on this sample is TiO 2 (Ti in Ti 4+ state), which its concentration changed from 100% in outmost layer to 43% in the depth of 8.4 nm. By decreasing the amount of the higher oxide state during going deep inside in the passive layer, the lower states (TiO and Ti 2 O 3 ) gradually appear and their concentration increase, which is in agreement with the behaviour observed for Ti-based alloys [54] and NiTi shape memory alloys [53,[55][56][57][58] where sub-oxides TiO and Ti 2 O 3 were enriched at the inner interface with the substrate. This procedure can be explained as follows: after the formation of TiO 2 on the outermost surface, further oxidation of Ti in the interface of the substrate and the newly formed TiO 2 layer depends on the diffusion of the oxygen into TiO 2 layer.…”

Section: Chemical Characterization Of Niti Thin Films By Xpssupporting

confidence: 86%

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

Saebnoori

Shahrabi

Sanjabi

et al. 2015

Philosophical Magazine

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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°C for 1 h. 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°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 +1.4 V (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 8.2 nm beneath the top surface, suggesting the excellent corrosion resistance of this sample in Ringer's solution.

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Section: Chemical Characterization Of Niti Thin Films By Xpssupporting

confidence: 86%

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

Saebnoori

Shahrabi

Sanjabi

et al. 2015

Philosophical Magazine

View full text Add to dashboard Cite

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“…Oxidation treatment [3,4], various coatings [5][6][7], laser melting [8] and ion implantation [9][10][11] have been performed on NiTi alloy to improve its mechanical and electrochemical properties. The critical challenge for coatings focuses on the binding strength because of the problem of delamination.…”

Section: Introductionmentioning

confidence: 99%

Surface characteristics, nano-indentation and corrosion behavior of Nb implanted NiTi alloy

Zhao

Xiang

et al. 2011

Surface and Coatings Technology

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“…Therefore, DLC film has received enormous attention as a biocompatible coating [38]. Studies have shown that the oxide significantly decreases Ni ion release into exterior medium compared with untreated surfaces [39][40][41]. Tantalum metal has successfully been used for implants for half a century.…”

Section: Corrosion Properties and Biocompatibility Of Niti-smamentioning

confidence: 99%

The applications and research progresses of nickel–titanium shape memory alloy in reconstructive surgery

Zeng

Tang

2010

Australas Phys Eng Sci Med

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In spite of some good successes and excellent researches of nickel-titanium shape memory alloy (NiTi-SMA) in reconstructive surgery, there are still serious limitations to the clinical applications of NiTi alloy today. The potential leakage of elements and ions could be toxic to cells, tissues and organs. This review discussed the properties, clinical applications, corrosion performance, biocompatibility, the possible preventive measures to improve corrosion resistance by surface/structure modifications and the long-term challenges of using SMAs.

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Surface structure and properties of biomedical NiTi shape memory alloy after Fenton’s oxidation

Cited by 72 publications

References 42 publications

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

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

Surface characteristics, nano-indentation and corrosion behavior of Nb implanted NiTi alloy

The applications and research progresses of nickel–titanium shape memory alloy in reconstructive surgery

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