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[目的]选择性激光熔化(SLM)技术制备的镍钛合金组件表面品质往往较差，表面常附着一些部分熔化的粉末，应进行适当的表面处理。[方法]采用氯化钠-乙二醇电解液对选区激光熔化制备的镍钛合金心血管支架进行电化学抛光。研究了电压、温度和抛光时间对镍钛合金心血管支架表面粗糙度的影响。分析了较佳条件下电化学抛光后心血管支架的表面形貌、化学成分和表面润湿性。[结果]较佳的电化学抛光参数为：电压25 V，温度28℃，时间25 min。在该条件下电化学抛光后，NiTi合金支架表面变得光滑均匀，表面粗糙度Sa低至0.31μm，水接触角增大到103.5°，即疏水性提升。[结论]电化学抛光能够显著提高以SLM工艺制备的镍钛合金心血管支架的表面品质，提高其生物兼容性。
Abstract：[Objective] The surface quality of nickel–titanium alloy(NiTi) components prepared by selective laser melting(SLM) technology is often poor with partially melted powders attaced to its surface. Therefore, appropriate surface treatment is necessary. [Method] Nitinol cardiovascular stent manufactured by SLM technology was electrochemically polished in an electrolyte composed of sodium chloride and ethylene glycol. The effects of voltage,temperature, and polishing time on the surface roughness of nitinol cardiovascular stent were studied. The surface morphology, chemical composition, and surface wettability of the stent electrochemically polished under the optimized conditions were analyzed. [Result] The electrochemical polishing process parametrs were optimized as follows: voltage 25 V, temperature 28 ℃, and polishing time 25 min. The surface of the nitinol stent became smooth and uniform with a surface roughness Sa of 0.31 μm after being polished under the optimized conditions. The water contact angle of nitinol stent was increased to 103.5°, indicating that its hydrophobicity was improved. [Conclusion] Electrochemical polishing can significantly improve the surface quality of nitinol cardiovascular stents manufactured by SLM technology, thereby enhancing their biocompatibility.
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基本信息:
DOI：10.19289/j.1004-227x.2025.02.005
中图分类号:R318;TG175
引用信息:
[1]王雅丽,李志永,张威等.镍钛合金心血管支架的电化学抛光工艺[J].电镀与涂饰,2025,44(02):30-35.DOI:10.19289/j.1004-227x.2025.02.005.
基金信息:
山东省自然科学基金（ZR2020ME161）