Superhydrophobic NiTi shape memory alloy surfaces fabricated by anodization and surface mechanical attrition treatment
| Autor: | Shih-Fu Ou, Yen-Chi Hsu, Kuang-Kuo Wang |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Scanning electron microscope Anodizing Metallurgy General Physics and Astronomy 02 engineering and technology Surfaces and Interfaces General Chemistry Shape-memory alloy 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Surface energy 0104 chemical sciences Surfaces Coatings and Films Contact angle Nickel titanium Wetting Composite material 0210 nano-technology |
| Zdroj: | Applied Surface Science. 425:594-602 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2017.07.038 |
| Popis: | This paper describes the fabrication of superhydrophobic NiTi shape memory alloy (SMA) surfaces using an environmentally friendly method based on an economical anodizing process. Perfluorooctyltriethoxysilane was used to reduce the surface energy of the anodized surfaces. The wettability, morphology, composition, and microstructure of the surfaces were investigated by scanning electron microscopy, transmission electron microscopy, and x-ray photoelectron spectroscopy. The surface of the treated NiTi SMA exhibited superhydrophobicity, with a water contact angle of 150.6° and sliding angle of 8°. The anodic film on the NiTi SMA comprised of TiO 2 and NiO, as well as traces of TiCl 3 . In addition, before the NiTi SMA was anodized, it underwent a surface mechanical attrition treatment to grain-refine its surface. This method efficiently enhanced the growth rate of the anodic oxide film, and improved the hydrophobic uniformity of the anodized NiTi-SMA-surface. |
| Databáze: | OpenAIRE |
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