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Electrochemical and microstructural study of Cu-Al-Ni shape memory alloy |
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| Authors: | Mirko Goji? Ladislav Vrsalovi?Stjepan Ko?uh Albert KneisslIvan An?el Senka Gudi?Borut Kosec Maja Kliški? |
| Affiliation: | a University of Zagreb, Faculty of Metallurgy, Aleja narodnih heroja 3, 44103 Sisak, Croatia b Faculty of Chemistry and Technology, Department of Electrochemistry and Materials Protection, Teslina 10/V, 2100 Split, Croatia c Department Metallkunde und Werkstoffprüfung, Montanuniversität Leoben, Franz-Josef-Straße 18, A-8700 Leoben, Austria d University of Maribor, Faculty of Mechanical Engineering, Smetanova ulica 17, 2000 Maribor, Slovenia e University of Ljubljana, Faculty of Natural Sciences and Engineering, Ašker?eva 12, 1000 Ljubljana, Slovenia |
| Abstract: | The corrosive behaviour of Cu-Al-Ni shape memory alloy in deaerated 0.5 M NaCl solution at 20 °C was studied by means of open circuit potential measurements, linear polarization, potentiodynamic polarization measurements, cyclic voltammetry and electrochemical impedance spectroscopy measurements. The electrode surface was examined by light microscope, SEM, XRD and EDX methods. The polarization measurements have shown that corrosive behaviour of Cu-Al-Ni alloy in NaCl solution was dominated by the Cu component. The results of impedance measurements at open circuit potential have shown that the overall impedance of the system increases with immersion time due to continuous growth of the passive film on the alloy surface. The XRD and EDX analysis showed the presence of copper, aluminium and nickel compounds, Cu-oxides and Cu-chlorides on alloy surface. |
| Keywords: | Shape memory alloys Corrosion Electrochemical impedance spectroscopy Microstructure Optical microscopy Scanning electron microscopy |
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