【摘要】 利用电沉积技术制备血管支架用可降解Fe-Zn合金镀层。研究了镀液组成对Fe-Zn合金镀层组织与性能的影响。结果表明:向镀液中加入0.50 mol/L的H₃BO₃和0.05 mol/L的C₃H₄O₄,能够控制Fe-Zn合金镀层中杂质元素O的质量分数。当C₆H₅Na₃O₇·2H₂O的浓度低于0.035 0 mol/L时,Fe-Zn合金镀层为柱状晶组织,硬度较低,并且具有（211）择优取向。当C₆H₅Na₃O₇·2H₂O的浓度高于0.035 0 mol/L时,Fe-Zn合金镀层为细晶组织,硬度增大,同时内应力较大。循环伏安曲线表明,随着C₆H₅Na₃O₇·2H2O的加入,Fe²⁺的析出电位负移,更接近Zn²⁺的析出电位,有利于Fe-Zn共沉积的进行。极化曲线和21 d SBF静态浸泡试验结果表明,随着晶粒的细化及Zn、O元素的增加,Fe-Zn合金镀层的自腐蚀电位由-0.45 V降低到-0.52 V,腐蚀降解速率由0.122 mg/（cm²·d）增加到0.153 mg/（cm²·d）。更多还原

【Abstract】 Degradable Fe-Zn alloy used for vascular stents was prepared by electrodeposition.The influence of bath composition on the microstructure and properties of Fe-Zn alloy coating was investigated.The results showed that the mass fraction of oxygen impurity in Fe-Zn alloy coating can be controlled by adding 0.50 mol/L H₃ BO₃ and 0.05 mol/L C₃ H₄ O₄ into the bath.When the concentration of C₆ H₅ Na₃ O₇·2 H₂ O was less than 0.035 0 mol/L,the Fe-Zn alloy coating had a columnar crystal structure with a low hardness and（211） preferred orientation.When the concentration of C₆ H₆ Na₃ O₇·2 H2 O was higher than 0.035 0 mol/L,the Fe-Zn alloy coating was fine-grained with a higher hardness and it was easy to break due to the large internal stress.The cyclic voltammetry tests showed that with the increase of the concentration of C₆ H₅ Na₃ O₇·2 H2 O,the deposition potential of Fe²⁺was negatively shifted to be closer to that of Zn²⁺,which was favorable for Fe-Zn co-deposition.The polarization curve and 21 day SBF static immersion tests showed that with the refinement of grains and increase of the Zn and O elements,the selfcorrosion potential of Fe-Zn alloy coating decreased from-0.45 V to-0.52 V,and the degradation rate increased from 0.122 mg/（cm²·d） to 0.153 mg/（cm²·d）更多还原