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On the Ni-Ion release rate from surfaces of binary NiTi shape memory alloys

机译：二元NiTi形状记忆合金表面的Ni离子释放速率

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The study is focused on Ni-ion release rates from NiTi surfaces exposed in the cell culture media and human vascular endothelial cell (HUVEC) culture environments. The NiTi surface layers situated in the depth of 70 mu m below a NiTi oxide scale are affected by interactions between the NiTi alloys and the bio-environments. The finding was proved with use of inductively coupled plasma mass spectrometry and electron microscopy experiments. As the exclusive factor controlling the Ni-ion release rates was not only thicknesses of the oxide scale, but also the passivation depth, which was two-fold larger. Our experimental data strongly suggested that some other factors, in addition to the Ni concentration in the oxide scale, admittedly hydrogen soaking deep below the oxide scale, must be taken into account in order to rationalize the concentrations of Ni-ions released into the bio-environments. The suggested role of hydrogen as the surface passivation agent is also in line with the fact that the Ni-ion release rates considerably decrease in NiTi samples that were annealed in controlled hydrogen atmospheres prior to bio-environmental exposures. (C) 2017 Elsevier B.V. All rights reserved.
机译：这项研究的重点是暴露于细胞培养基和人血管内皮细胞（HUVEC）培养环境中的NiTi表面的Ni离子释放速率。 NiTi氧化物层以下70微米深的NiTi表面层受到NiTi合金与生物环境之间相互作用的影响。使用感应耦合等离子体质谱法和电子显微镜实验证明了这一发现。作为控制Ni离子释放速率的唯一因素，不仅是氧化皮的厚度，而且是钝化深度的两倍，钝化深度大两倍。我们的实验数据强烈建议，除氧化皮中的Ni浓度外，还必须考虑其他一些因素，以使氢在氧化皮下的浸入深度深浅，以使释放到生物体中的Ni离子浓度合理化。环境。氢作为表面钝化剂的建议作用还符合以下事实：在生物环境暴露之前，在受控氢气氛中退火的NiTi样品中，Ni离子的释放速率大大降低。 （C）2017 Elsevier B.V.保留所有权利。

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