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首页> 外文期刊>Surface & Coatings Technology >In vitro corrosion behavior of TiN layer produced on orthopedic nickel-titanium shape memory alloy by nitrogen plasma immersion ion implantation using different frequencies
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In vitro corrosion behavior of TiN layer produced on orthopedic nickel-titanium shape memory alloy by nitrogen plasma immersion ion implantation using different frequencies

机译：矫形镍钛形状记忆合金通过不同频率氮等离子体浸入离子注入制备的TiN层的体外腐蚀行为

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摘要

In the present work, the NiTi surface was modified by nitrogen plasma immersion ion implantation (PIII) in an effort to improve the corrosion resistance and mitigate nickel release from the materials. The implanted nitrogen depths and thicknesses of the surface TiN barrier layers were varied by changing the pulsing frequencies during Pill. In order to determine the optimal parameters including the pulsing frequencies, electrochemical tests including open circuit potential (OCP) measurements and potentiodynamic polarization tests were conducted on the untreated and N-implanted NiTi in simulated body fluids (SBF). Our results reveal that the nitride layer produced using a frequency of 50 Hz has the best stability under the OCP conditions and the TiN layer produced using 200 Hz has the highest potentiodynamic stability after immersion in SBF for a long time. The observation can be correlated to the temperature during PIII and the thickness of TiN layer. The TiN layer on the NiTi surface favors deposition of Ca-P composites thereby compensating for the instability of the TiN layer produced at a higher frequency. (C) 2007 Elsevier B.V. All rights reserved.
机译：在目前的工作中，通过氮等离子体浸没离子注入（PIII）对NiTi表面进行了改性，以提高耐蚀性并减轻镍从材料中的释放。通过改变药丸期间的脉冲频率来改变表面TiN势垒层的注入氮深度和厚度。为了确定包括脉冲频率在内的最佳参数，对模拟体液（SBF）中未处理和N注入的NiTi进行了包括开路电势（OCP）测量和电位动力学极化测试在内的电化学测试。我们的结果表明，在OCP条件下，使用50 Hz频率产生的氮化物层具有最佳的稳定性，而长时间浸泡在SBF中后，使用200 Hz产生的TiN层具有最高的电位动力学稳定性。该观察结果可以与PIII期间的温度和TiN层的厚度相关。 NiTi表面上的TiN层有利于Ca-P复合材料的沉积，从而补偿了以较高频率产生的TiN层的不稳定性。 （C）2007 Elsevier B.V.保留所有权利。

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