Arsenic contamination of coarse‐grained and nanostructured nitinol surfaces induced by chemical treatment in hydrofluoric acid

Korotin, Danila M.; Bartkowski, S.; Kurmaev, E.Z.; Borchers, C.; Müller, Markus; Neumann, M.; Gunderov, D. V.; Valiev, R. Z.; Cholakh, S. O.

doi:10.1002/jbm.b.32748

Cited by 5 publications

(5 citation statements)

References 9 publications

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“…Arsenic is naturally present in CaF 2 in the trivalent As-III state and is impossible to completely remove [39], which can explain why traces of As are present even in the purest commercially available hydrofluoric acid [40]. We observed a similar result for the surface of coarse-grained and nanostructured nitinol after etching the nitinol in hydrofluoric acid (HF 40%, for 1 min) [41]. The XRD patterns of the anodically oxidised AMo2, BMo4, and CMo2 sample surfaces are shown in Fig.…”

Section: Chemical and Phase Analysis Of Selected Sample Surfacessupporting

confidence: 69%

Modification of a Ti–Mo alloy surface via plasma electrolytic oxidation in a solution containing calcium and phosphorus

Simka

Krząkała

Korotin

et al. 2013

Electrochimica Acta

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a b s t r a c tInvestigations into the surface modification of a Ti-15Mo alloy via plasma electrolytic oxidation are reported. The oxidation process was conducted in a solution containing Ca(H 2 PO 2 ) 2 , H 3 PO 4 , or (HCOO) 2 Ca. Anodisation was performed at voltages in the range of 100-400 V. The morphology of the sample surface did not change during alloy oxidation at lower voltages. Higher voltages led to the incorporation of calcium and phosphorus or of calcium only into the formed oxide layer and to significant modification of the surface morphology. Based on the SEM and EDX analysis results, a set of samples was selected for further investigations. To study the surface of the Ti-Mo alloy after anodic oxidation, we used scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), thin-layer X-ray diffraction (TL-XRD), and X-ray photoelectron spectroscopy (XPS). The electrochemical characteristics of the modified alloy in Ringer's solution were determined. Anodisation results in a considerable increase in the corrosion resistance of the Ti-15Mo alloy.

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Section: Chemical and Phase Analysis Of Selected Sample Surfacessupporting

confidence: 69%

Modification of a Ti–Mo alloy surface via plasma electrolytic oxidation in a solution containing calcium and phosphorus

Simka

Krząkała

Korotin

et al. 2013

Electrochimica Acta

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“…However, the alloy was more corrosion resistant in NaCl solutions. In other studies [91,95,96,97], no difference was found between the corrosion processes of micro- and nanostructured NiTi. However, nanostructured Ti was found to exhibit reduced corrosion resistance [98].…”

Section: Discussionmentioning

confidence: 81%

Ion Release and Surface Characterization of Nanostructured Nitinol during Long-Term Testing

et al. 2019

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The corrosion resistance of nanostructured nitinol (NiTi) was investigated using long-term tests in solutions simulating physiological fluids at static conditions, reflecting the material structure and metal concentration in the solutions. Mechanical polishing reduced the ion release by a factor of two to three, whereas annealing deteriorated the corrosion resistance. The depassivation and repassivation of nitinol surfaces were considered. We found that nanostructured nitinol might increase the corrosion leaching of titanium into solutions, although the nickel release decreased. Metal dissolution did not occur in the alkaline environment or artificial plasma. A Ni-free surface with a protective 25 nm-thick titanium oxide film resulted from soaking mechanically treated samples of the NiTi wire in a saline solution for two years under static conditions. Hence, the medical application of nanostructured NiTi, such as for the production of medical devices and implants such as stents, shows potential compared with microstructured NiTi.

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“…Investigations showed that in HCl nitinol in the nanosized state (grain diameter of 10 nm) reveals a significantly lower corrosion resistance than in the microstructural state because of an increase in the boundary length and in the amount of defects of the grain structure; and nitinol in NaCl, on the contrary, is more passive (consequently corrosion resistant) [26]. In the study [25,[27][28][29], there is no difference in corrosion processes between micro-and nanostructured nitinol. But in case of nanostructured titanium, corrosion resistance reduction was observed [30] though in all works positive influence on mechanical properties of materials was noted.…”

Section: Introductionmentioning

confidence: 96%

Applications of Nanostructural NiTi Alloys for Medical Devices

Nasakina¹,

Sevostyanov²,

Баикин³

et al. 2017

Shape Memory Alloys - Fundamentals and Applications

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New nanostructural shape memory alloy (55.91 wt% of Ni and 44.03 wt% of Ti) for the production of minimally invasive implantation medical devices (stents) was tested for corrosion resistance under static conditions by dipping it into solutions with various acidities (pH from 1.68 to 9.18) for 2 years, for static mechanical properties and for biocompatibility. The material for investigations was 280-μm wires before and after thermal treatment at 450°C for 15 min in air and surface mechanical treatment. The characteristic image and size of grains were determined using the transmission electron microscope (TEM), and the phase composition; surface morphology; and the layer-bylayer composition were investigated using an X-ray diffractometer; a scanning electron microscope (SEM); and an Auger spectrometer. The nickel release from the investigated nanostructural nitinol is less in comparison with data for microstructural nitinol in a solution of any acidity. Dissolution in the alkali medium is absent. A significant retardation of the nickel ion release (and insignificant concentration as a whole) and the absence of titanium ion release in the weakly acidic and neutral solutions with polished samples are observed. A simultaneous 7-11% increase in strength and plasticity in comparison with microstructural nitinol was attained. Toxicity of samples has not been revealed.

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Arsenic contamination of coarse‐grained and nanostructured nitinol surfaces induced by chemical treatment in hydrofluoric acid

Cited by 5 publications

References 9 publications

Modification of a Ti–Mo alloy surface via plasma electrolytic oxidation in a solution containing calcium and phosphorus

Modification of a Ti–Mo alloy surface via plasma electrolytic oxidation in a solution containing calcium and phosphorus

Ion Release and Surface Characterization of Nanostructured Nitinol during Long-Term Testing

Applications of Nanostructural NiTi Alloys for Medical Devices

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