Long-term corrosion tests of nanostructural nitinol of (55.91 wt % Ni, 44.03 wt % Ti) composition under static conditions: Composition and structure before and after corrosion

Nasakina, E. O.; Sevostyanov, M. A.; Goldberg, M. A.; Demin, K. Yu.; Баикин, А. С.; Goncharenko, B. A.; Cherkasov, V.A.; Колмаков, А. Г.; Zabolotnyi, V. T.

doi:10.1134/s2075113315010104

Cited by 8 publications

(7 citation statements)

References 13 publications

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“…The bright- and dark-field TEM images of the nanostructured NiTi wires (Figure 1) showed that the alloy grains occurred as nanofibers 30–70 nm in diameter and several micrometers long, with the grains extending along the wire axis. The microdiffraction, EDS, XRD, and microstructural analyses revealed that the main component of NiTi was a B2-phase TiNi, with flecks of Ti 2 Ni intermetallic compounds [79]. The composition was found to be unchanged by the treatment processes.…”

Section: Resultsmentioning

confidence: 99%

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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Section: Resultsmentioning

confidence: 99%

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

et al. 2019

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“…Wire samples with a weight by 32.6 mg (separately from each other) were placed into flasks with 100 mL of the selected solution and aged totally in a dark place for up to 730 days. Sampling from flaks for analysis was after a selected period (7,14,30,60,90,180,360, or 730 days). The initial buffer solutions were used as reference solutions.…”

Section: Obtaining and Investigating Of Biocompatible Composites Of Mmentioning

confidence: 99%

“…In the remained cases, elements' concentration in solutions increases (Figures 15 and 16) over time, but leaching of elements in medium considerably slows down. It can be related to sequential processes of the destruction and renewal of the protective film (de-and repassivation) on defect areas [30,31].…”

Section: Obtaining and Investigating Of Biocompatible Composites Of Mmentioning

confidence: 99%

Using of Magnetron Sputtering for Biocompatible Composites Creating

Nasakina¹,

Sevostyanov²,

Баикин³

et al. 2019

Advances in Composite Materials Development

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Biocompatible composites obtained using the magnetron sputtering for the production of minimally invasive implantation medical devices (stents) were investigated. Nano-and microdimensional surface layers of Ta, Ti, Ag, and Cu on flat and wire NiTi, Cu, Ti, and SiO 2 substrates were created. The phase composition, surface morphology, and the layer-by-layer composition were investigated on an X-ray diffractometer, SEM, and Auger spectrometer. It was shown that the thickness and the structure of surface layers were affected by the sputtering distance, time, power, and the bias voltage at the substrate. The presence of the transition layer that contains both substrate and target elements and provides high adhesion of the surface layer to the substrate has been demonstrated. The material was tested for corrosion resistance under static conditions by dipping into solutions with various acidities (pH from 1.68 to 9.18) for 2 years, static mechanical properties, and biocompatibility in vitro and in vivo. A slight corrosive dissolution was observed only in a medium with a pH of 1.56. Dissolution in the other media is absent. An increase in strength and plasticity in comparison with substrate was attained depending on the nature of the sputtered substance and substrate. Toxicity of samples has not been revealed.

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“…This oxide layer is in fact responsible for the biocompatibility of Ti/Ti alloy. The thickness and the composition of natural oxide coatings, which appear in the presence of air or oxidizing media, and which are based on mainly TiO 2 , Ti 2 O 3 or TiO, depend on the environmental conditions [13][14][15][35][36][37]. However, the stoichiometric defects and the low stability of this film can lead, in the case of implants, to their delamination and loosening.…”

Section: Introductionmentioning

confidence: 99%

1D Titania Nanoarchitecture as Bioactive and Photoactive Coatings for Modern Implants: A Review

Radtke¹

2017

Application of Titanium Dioxide

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The research efforts in understanding the influence of TiO 2 1D nanoarchitecture structure and morphology on its biological and photocatalytic activity absorbed a lot of attention during last few years. Nowadays, the application of TiO 2 coatings in biomedical technologies (e.g., in modern implantology) requires the material of strictly defined structure and morphology, possessing both high biocompatibility, as well as antimicrobial properties. The presented review is a compilation of interdisciplinary knowledge about the application of 1D TiO 2 nanostructural coatings (nanotubes, nanofibres, nanowires) in biomedical technologies. The methods and parameters of their synthesis, and the physicochemical techniques used in the characterization of their structure and morphology, are discussed. Moreover, their ability to be applied as innovative coatings for modern implants is presented.

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Long-term corrosion tests of nanostructural nitinol of (55.91 wt % Ni, 44.03 wt % Ti) composition under static conditions: Composition and structure before and after corrosion

Cited by 8 publications

References 13 publications

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

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

Using of Magnetron Sputtering for Biocompatible Composites Creating

1D Titania Nanoarchitecture as Bioactive and Photoactive Coatings for Modern Implants: A Review

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