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首页> 外文期刊>International Journal of Electrochemical Science >Fabrication and Corrosion Resistance of the Ti-rich Alloyed Layer on the Surface of NiTi Alloys
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Fabrication and Corrosion Resistance of the Ti-rich Alloyed Layer on the Surface of NiTi Alloys

机译：NiTi合金表面富钛合金层的制备和耐蚀性

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In this paper, the Ti-rich alloyed layer was prepared on the surface of NiTi alloys by the plasma surface alloying technique. The surface and cross-section morphology, elemental composition distribution and structural characteristics of the ?lms were assessed by scanning electron microscope (SEM), glow discharge optical emission spectroscopy (GDOES) and X-ray diffraction (XRD) techniques, respectively. The thermodynamic and kinetic corrosion properties of the Ti-rich alloyed layer were investigated under simulated body fluid conditions by using open circuit potential and potentiodynamic polarization tests. Electrochemical impedance spectroscopy (EIS) combined with equivalent circuit modelling was implemented to analyze the frequency response. The results showed that the cross-section microstructure was composed of a 10μm thick loose outer deposition layer and an 8μm thick dense inner diffusion layer, including the phases of Ti2Ni, TiNi and Ti. The passive current density for the Ti-rich alloyed layer was around 1.1×109 A·cm-2 and 40 times lower than that of NiTi substrate. The polarization resistance evaluated from the EIS was found to be increased approximately 10 times from 6.133×105 Ω·cm2 for the uncoated NiTi sample to 7.558×106 Ω·cm2 for the alloyed sample. These evidences illustrate that the Ti-rich alloyed layer possess higher corrosion resistance in SBF solution compared to the NiTi substrate. The Mass Spectrometry test results evidenced that the Ti-rich alloyed layer can significant inhibited the release of Ni ion into the human body system.
机译：本文采用等离子表面合金化技术在NiTi合金表面制备了富钛合金层。分别通过扫描电子显微镜（SEM），辉光放电光发射光谱（GDOES）和X射线衍射（XRD）技术评估了薄膜的表面和横截面形态，元素组成分布和结构特征。通过使用开路电势和电位动力学极化试验，在模拟体液条件下研究了富钛合金层的热力学和动力学腐蚀性能。电化学阻抗谱（EIS）结合等效电路建模进行了分析频率响应。结果表明，该断面的显微组织由厚度为10μm的疏松外层沉积层和厚度为8μm的致密内扩散层组成，包括Ti2Ni，TiNi和Ti相。富钛合金层的无源电流密度约为1.1×109 A·cm-2，比NiTi衬底低40倍。发现由EIS评估的极化电阻从未涂覆的NiTi样品的6.133×105Ω·cm2增加到合金化样品的7.558×106Ω·cm2约10倍。这些证据表明，与NiTi基体相比，富含Ti的合金层在SBF溶液中具有更高的耐腐蚀性。质谱测试结果证明，富钛合金层可以显着抑制镍离子向人体系统的释放。

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