Corrosion Behaviors of Sputtered NiTiCu Shape Memory Films

• 作者: Nan Ye Xueping Ren
• 来源期刊: 材料科学与化学工程(英文)
• 学科: 工学
• 关键词: Corrosion NiTiCu SHAPE MEMORY Alloy ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY NiTiCu FILMS
• 年，卷（期）: 2020,（2）
• 页码范围: 7-15
• 页数: 9页
• 分类号: TG1

摘要

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.