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Open AccessArticle

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

Laboratory of Durability and Plasticity of Metal and Composite Materials and Nanomaterials, Institution of Russian Academy of Sciences, A.A. Baikov Institute of Metallurgy and Material Science RAS (IMET RAS), Leninsky Prospect, 49, 119991 Moscow, Russia
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Nanomaterials 2019, 9(11), 1569; https://doi.org/10.3390/nano9111569
Received: 14 September 2019 / Revised: 17 October 2019 / Accepted: 28 October 2019 / Published: 5 November 2019
(This article belongs to the Special Issue Biomedical Applications of Nanotechnology)
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.
Keywords: alloy; nickel; titanium; pitting corrosion; repassivation alloy; nickel; titanium; pitting corrosion; repassivation
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MDPI and ACS Style

Nasakina, E.O.; Sudarchikova, M.A.; Sergienko, K.V.; Konushkin, S.V.; Sevost’yanov, M.A. Ion Release and Surface Characterization of Nanostructured Nitinol during Long-Term Testing. Nanomaterials 2019, 9, 1569.

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