利用电化学阻抗谱研究铜颗粒尺寸对铜/低密度聚乙烯复合材料在模拟宫腔液中腐蚀的影响

INVESTIGATION OF THE INFLUENCE OF THE SIZES OF COPPER PARTICLES ON THE CORROSION OF THE Cu/LDPE COMPOSITES IN THE SIMULATED UTERINE SOLUTION BY USING EIS

用电化学阻抗谱技术(electrochemical impedance spectroscopy,EIS),研究了铜/低密度聚乙烯(Cu/LDPE)复合材料在模拟宫腔液中的腐蚀行为,根据EIS特征建立等效电路模型并进行数据拟合分析,获得了复合材料及其表层对应的界面电化学信息参数,如双电层电容、电荷转移电阻、Warburg阻抗等,通过比较两种材料表层状态随时间的变化,探讨了复合材料中铜颗粒尺寸对复合材料腐蚀的影响。结果表明,纳米复合材料比微米复合材料的腐蚀速率低,且材料表层不易沉积腐蚀产物,更适合作为新型宫内节育器材料。

The corrosion behavior of Cu/LDPE composites in the simulated uterine solution （SUS） was monitored using electrochemical impedance spectroscopy （EIS）. According to the EIS characteristics, the equivalent circuits were established. The electrochemical parameters of the composites and its interface were obtained, including double layer capacitance, charge transfer resistance, Warburg impedance and so on. By comparing the change of interface stats of two composites with time, the influence of copper particles on composites corrsion was discussed. The results indicated that the corrosion rate of nanocomposite is lower than that of microcomposite and there is less deposit on the surface of the nanocomposite. The nanocomposite is a superior material to make new type intrauterine device.