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首页> 外文期刊>Biomaterials >Passivation of nitinol wire for vascular implants--a demonstration of the benefits.
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Passivation of nitinol wire for vascular implants--a demonstration of the benefits.

机译：用于血管植入物的镍钛诺丝的钝化-证明其好处。

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This study investigated a passivation process for polished nitinol wires and vascular stent components, after being given a typical shape setting heat treatment. Heat treated samples were passivated in a nitric acid solution and a series of corrosion tests, surface analysis and chemical analysis was performed. Potentiodynamic polarization tests demonstrated a significant increase in breakdown potential for passivated samples, compared to heat treated surfaces. Surface analysis indicated that the passivation reduces Ni and NiO content in the oxide and increases TiO2 content. Chemical analysis of passivation solutions suggests that the improvement in corrosion resistance is proportional to the quantity of nickel removed. Long term immersion tests demonstrate that nickel release from the surface of the material decreases with time and the quantity of nickel released is lower for passivated samples. The improved corrosion resistance is maintained after extended periods of immersion in saline solution.
机译：这项研究研究了抛光镍钛合金丝和血管支架组件的钝化过程，然后对其进行了典型的定型热处理。将热处理过的样品在硝酸溶液中钝化，并进行一系列腐蚀测试，表面分析和化学分析。电位动力学极化测试表明，与热处理过的表面相比，钝化样品的击穿电位显着增加。表面分析表明，钝化降低了氧化物中的Ni和NiO含量，并增加了TiO2含量。钝化溶液的化学分析表明，耐蚀性的提高与镍去除量成正比。长期浸没测试表明，从钝化样品中镍从材料表面的释放随时间而减少，而镍的释放量则较低。长时间浸泡在盐溶液中后，可以保持改善的耐腐蚀性。

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