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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。
In situ growth of graphene by chemical vapor deposition on the surface of nickel-titanium shape memory alloy, intends to improve the corrosion resistance of nickel-titanium shape memory alloy. The surface morphology and morphology of the modified graphene alloy were characterized by X-ray photoelectron spectroscopy, Raman spectroscopy and scanning electron microscopy. The effect of graphene on the corrosion rate, cytotoxicity and metal release of NiTi shape memory alloys was investigated in artificial saliva environment. The results show that graphene can act as a physical shield between the metal matrix and the corrosive medium, which can obviously reduce the corrosion rate of the metal matrix and provide strong protection for the nickel-titanium alloy.