Microstructural characterization of oxide film formed on NiTi by anodization in acetic acid

Cheng, F. T.; Shi, Ping; Pang, G.K.H.; Wong, M.H.; Man, Hau Chung

doi:10.1016/j.jallcom.2006.08.020

Cited by 70 publications

(32 citation statements)

References 24 publications

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“…Regarding chemical surface composition, the values reported in this work for atomic Ni/Ti ratios on the surface of diamond and alumina polished samples are in agreement with those reported by Cheng et al 38 for similar materials. Ponsonnet et al 39 attributed the higher atomic ratio (0.25) of grade 2400 polished Nitinol to Ni diffusion to the surface during mechanical polishing.…”

Section: Discussionsupporting

confidence: 92%

Effect of Nitinol surface treatments on its physico‐chemical properties

et al. 2009

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The main purpose of this work is the study of different physicochemical treatments on Nitinol slabs and wires, with the aim of inducing the formation of a TiO(2) surface film capable of increasing the corrosion resistance of the material and of reducing the release of Ni when the Nitinol samples were immersed in simulated body fluid (SBF). To this end, a battery of measurements (surface roughness, contact angle, electrochemical corrosion, chemical analysis as a function of depth, and Ni release to SBF) has been used to characterize Nitinol commercial samples, as received, and also after the different treatments performed. The results clearly indicate the effectiveness of the passivation TiO(2) layer as a barrier against Ni leaching, and the detrimental effects of any processes (such as polishing or cutting) that result in exposure of areas not coated by the TiO(2) film. Chemical methods such as oxidation in nitric acid or hydrothermal treatment of the samples (by prolonged immersion in boiling water) seem to provide simple and efficient ways of forming TiO(2) films of adequate thickness on the Nitinol surface.

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Section: Discussionsupporting

confidence: 92%

Effect of Nitinol surface treatments on its physico‐chemical properties

et al. 2009

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“…The Ni concentration at the surface of as-anodized NiTi (in the order of 0.8 at.%) was similar to that in DC anodized NiTi [35]. After hydrothermal treatment, the surface Ni concentration was further reduced by about 50% for both A-W-NiTi and A-CaPNiTi (Table 4).…”

Section: Sample Characteristicsmentioning

confidence: 60%

Characteristics, apatite-forming ability and corrosion resistance of NiTi surface modified by AC anodization

Wong

Cheng

Man

2007

Applied Surface Science

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“…Among these techniques, the thickening of the spontaneously formed natural oxide film on nitinol by anodic polarization in appropriate electrolyte solutions has resulted in improved corrosion resistance, one of the biocompatibility key-governing factors for nitinol implantation [10][11][12][13]. Also, the high voltage anodization was carried out in various electrolytes to produce thick porous layers [14].…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

“…Also, the high voltage anodization was carried out in various electrolytes to produce thick porous layers [14]. Anodic oxidation represents an effective way of modifying and controlling the properties of the metal surface [11][12][13]. It can be expected that thin anodic oxide films have potential for application in areas where the specific surface functionalization by thin films is essential for the quality of the metal implant application.…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

Kinetics of passivity of NiTi in an acidic solution and the spectroscopic characterization of passive films

Metikoš‐Huković

Katić

Milošev

2012

J Solid State Electrochem

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Anodic polarization of nitinol in acetic acid under galvanostatic conditions produces oxide films composed mainly of TiO 2 . An exponential current-field relation is valid during ionic conduction through the growing oxide, in which the field coefficient is related to the jump distance. Transport processes in anodic films have been discussed in terms of a cooperative mechanism developed for amorphous oxide films on valve metals, in which both metal and oxygen ions were involved in ionic conduction. For more crystalline oxide structure of passive films on nitinol, formed during a prolonged potentiostatic conditions, the charge transfer takes place only through the oxygen vacancies as mobile species via a high-field-assisted mechanism. Based on the results of the Mott-Schottky analysis, these films behave as n-type semiconductors indicating that oxygen vacancies formed during the film formation and growth act as electron donors. The barrier/protecting and electronic/ semiconducting properties of the passive films as well as their chemical composition were studied using electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy.

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Microstructural characterization of oxide film formed on NiTi by anodization in acetic acid

Cited by 70 publications

References 24 publications

Effect of Nitinol surface treatments on its physico‐chemical properties

Effect of Nitinol surface treatments on its physico‐chemical properties

Characteristics, apatite-forming ability and corrosion resistance of NiTi surface modified by AC anodization

Kinetics of passivity of NiTi in an acidic solution and the spectroscopic characterization of passive films

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