Abstract
For NiTiCu SMA, the Ni atoms are substituted by Cu atoms, which not only greatly reduce the alloy cost, but also have excellent shape memory effect. Four kinds of shape memory alloy films (Ni49.6Ti50.4, Ni48.2Ti50.4Cu1.4, Ni45.6Ti50.4Cu4, Ni42.7Ti50.4Cu6.9) were prepared using magnetron sputtering. Corrosion behaviors of the four films in phosphate buffered saline (PBS) solutions at 37°C were examined using electrochemical impedance spectroscopy (EIS) method. It was found that the corrosion resistance of the NiTi film is superior to the three NiTiCu films. The EIS data were fitted using a parallel resistance-capacitance (as a constant phase element) circuit associated with the surface oxide film. The thickness of the surface oxide layer of the three NiTiCu films increases with applied potential till 0.8 V, while that of the NiTi film can reach to 1.2 V.
Highlights
Shape memory alloys (SMA) have attracted much attention over the past few decades, and NiTi SMA is one of the most studied among other SMAs [1] [2] [3] [4] [5]
It was found that the corrosion resistance of the NiTi film is superior to the three NiTiCu films
The electrochemical impedance spectroscopy (EIS) data were fitted using a parallel resistance-capacitance circuit associated with the surface oxide film
Summary
Shape memory alloys (SMA) have attracted much attention over the past few decades, and NiTi SMA is one of the most studied among other SMAs [1] [2] [3] [4] [5]. The main application of binary NiTi SMAs is in the field of biomedical devices. NiTiCu SMAs have attracted some attention from both industrial applications and academic researches [10] [11] [12]. There are few reports on the corrosion behavior of sputtered NiTiCu shape memory alloys in simulated physiological solution. This work used the EIS method to study the corrosion behavior of NiTiCu shape memory alloys with different Cu contents
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