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首页> 外文期刊>Journal of Materials Engineering and Performance >The Influence of Surface Nanocrystallization Induced by Shot Peening on Corrosion Behavior of NiTi Alloy
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The Influence of Surface Nanocrystallization Induced by Shot Peening on Corrosion Behavior of NiTi Alloy

机译：喷丸处理引起的表面纳米化对NiTi合金腐蚀行为的影响

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摘要

Nickel-titanium (NiTi) shape memory alloys have been widely used as implant materials, due to their superior shape memory properties and similar mechanical behavior to bone tissue. The presence of nickel on the surface of nickel-titanium alloy and release of this ion in the body environment will result in some allergic reactions. In current study, we used shot pinning process to produce nanocrystalline nickel-titanium alloy with increased corrosion resistance. Field emission scanning electron microscopy (FE-SEM), x-ray diffraction (XRD) analysis, and atomic force microscopy were employed to investigate the surface features of samples. The quantitative chemical analysis of NiTi and modified NiTi samples was conducted by energy dispersive x-ray method. The electrochemical behavior of NiTi alloy was evaluated using the potentiodynamic polarization scan and electrochemical impedance spectroscopy tests in Ringer solution after and prior to the shot pining process. The result of XRD analysis of modified samples showed an average crystalline size of 23 nm. Moreover, FE-SEM confirmed the development of a nanostructured alloy induced by shot pinning process. Modification of NiTi alloy by shot-peening process resulted in corrosion resistance improvement and decrease in the corrosion rate, which consequently led to less release rate of the toxic nickel ions in the corrosive environment, compared to the non-modified samples.
机译：镍钛（NiTi）形状记忆合金由于其优异的形状记忆特性和与骨组织相似的机械性能而被广泛用作植入材料。镍钛合金表面上镍的存在以及该离子在人体环境中的释放将导致某些过敏反应。在当前的研究中，我们使用喷钉工艺来生产具有增强的耐蚀性的纳米晶镍钛合金。场发射扫描电子显微镜（FE-SEM），X射线衍射（XRD）分析和原子力显微镜用于研究样品的表面特征。通过能量色散X射线法对NiTi和改性NiTi样品进行定量化学分析。在针扎工艺之前和之后，在林格溶液中使用电位动力学极化扫描和电化学阻抗谱测试评估了NiTi合金的电化学行为。改性样品的XRD分析结果显示平均晶体大小为23nm。而且，FE-SEM证实了通过钉扎工艺诱导的纳米结构合金的发展。与未改性样品相比，通过喷丸硬化处理对NiTi合金进行改性可提高耐蚀性并降低腐蚀速率，从而导致在腐蚀性环境中有毒镍离子的释放速率降低。

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