Corrosion of NiTi wires with cracked oxide layer

0432510 - FZÚ 2015 RIV US eng J - Článek v odborném periodiku
Racek, Jan - Šittner, Petr - Heller, Luděk - Pilch, Jan - Petrenec, M. - Sedlák, Petr
Corrosion of NiTi wires with cracked oxide layer.
Journal of Materials Engineering and Performance. Roč. 23, č. 7 (2014), s. 2659-2668. ISSN 1059-9495. E-ISSN 1544-1024.
[International Conference on Shape Memory and Superelastic Technologies (SMST 2013). Praha, 21.05.2013-24.05.2013]
Grant CEP: GA ČR GPP108/12/P111; GA ČR GAP107/12/0800; GA MŠMT(CZ) 7E11058
GRANT EU: European Commission(XE) 262806 - SmartNets
Institucionální podpora: RVO:68378271 ; RVO:61388998
Klíčová slova: bending * electrochemical corrosion tests * martensitic transformation * shape memory alloy * superelastic NiTi wires
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 0.998, rok: 2014

Corrosion behavior of superelastic NiTi shape memory alloy wires with cracked TiO2 surface oxide layers was investigated by electrochemical corrosion tests (Electrochemical Impedance Spectroscopy, Open Circuit Potential, and Potentiodynamic Polarization) on wires bent into U-shapes of various bending radii. Cracks within the oxide on the surface of the bent wires were observed by FIB–SEM and TEM methods. The density and width of the surface oxide cracks dramatically increase with decreasing bending radius. The results of electrochemical experiments consistently show that corrosion properties of NiTi wires with cracked oxide layers (static load keeps the cracks opened) are inferior compared to the corrosion properties of the straight NiTi wires covered by virgin uncracked oxides.
Trvalý link: http://hdl.handle.net/11104/0236848