石墨烯对镍钛形状记忆合金耐腐蚀性能的影响

利用化学气相沉积法在镍钛形状记忆合金表面原位生长出石墨烯,拟提高镍钛形状记忆合金的抗腐蚀性能。通过X射线光电子能谱、拉曼光谱与扫描电镜等手段对其表征,分析石墨烯修饰后的合金表面结构和形貌。在人工唾液环境中探究了石墨烯对镍钛形状记忆合金的腐蚀速率、细胞毒性和金属释放的影响。结果表明,石墨烯在金属基体和腐蚀介质之间可以起到物理屏蔽作用,可明显地降低金属基体发生腐蚀的速率,对镍钛合金具有较强的保护能力。

Effects of Graphene on Anticorrosion Properties of Nickel Titanium Shape Memory Alloys

To improve the corrosion resistant properties of nickel titanium shape memory alloys, graphene was in-situ synthesized by chemical vapor deposition on the surface of nickel titanium. The structures and surface morphologies of prepared materials were characterized by X-ray photoelectron spectroscopy, Raman spectroscopy and scanning electron microscope. Furthermore, in the artificial saliva environment the influences of graphene on the corrosion speed, cytotoxicity and metal release of shape memory alloy were studied. The results show that graphene between metal matrix and corrosive medium plays a physical shielding role, significantly reducing the corrosion rate of metal matrix and protecting the nickel titanium alloy.