【摘要】 目的通过控制微弧氧化工艺参数来优化纯锌的耐蚀性,以实现临床降解的可控性。方法通过设置正向电压、反应时间、占空比、负向电压和分段处理等,在纯锌表面制备微弧氧化膜层。利用扫描电镜（SEM）观察膜层的表面形貌和截面厚度,结合能谱仪（EDS）和X射线衍射仪（XRD）分析膜层元素和相结构,采用表面张力测量仪和电化学极化曲线分析润湿性和耐蚀性。结果通过提高正向电压,降低占空比,控制处理时间和负向电压,可有效降低膜层孔隙率和腐蚀速度。微弧氧化处理可明显增强试样表面亲水性,分段处理对润湿性和耐蚀性有显著影响。当正向电压为300 V,占空比为10%,反应时间为5 min,负向电压为–100 V时,可获得亲水性好、耐蚀性强的微弧氧化膜层,其孔隙率为10.95%,膜层厚度为5.29μm,腐蚀电流密度达5.74×10^–6A/cm²。结论微弧氧化处理可明显增强纯锌表面润湿性,可通过调节不同微弧氧化工艺参数改变膜层结构,优化其亲水性和耐蚀性。更多还原

【Abstract】 This paper aims to achieve the medical degradation controllability by optimizing the corrosion resistance of pure zinc through controlling the technological parameters of micro-arc oxidation. By setting different technological parameters such as positive voltage, reaction time, duty cycle, negative voltage and subsection treatment, a micro-arc oxidation（MAO） film was formed on the surface of pure zinc. The surface morphology and section thickness of the MAO film were observed by scanning electron microscopy（SEM）. Elements and phase structure of the MAO film were analyzed by energy disperse spectroscopy（EDS） and X-ray diffraction（XRD）. The wettability and corrosion resistance were analyzed by surface tension meter and electrochemical polarization curve. The results show that the porosity and corrosion rate of the film could be effectively reduced by increasing the positive voltage, reducing the duty cycle and controlling the treatment time and negative voltage, the micro-arc oxidation treatment can increase the hydrophilicity of the sample surface, and the segmented treatment has a significant effect on wettability and corrosion resistance. When the positive voltage is 300 V, the duty cycle is 10%, the reaction time is 5 min, and the negative voltage is –100 V, the MAO films with strong hydrophilicity and good corrosion resistance can be formed. The film has a porosity of 10.95%, a film thickness of 5.29 μm and a corrosion current density of 5.74×10^–6A/cm². Therefore, it is concluded that the micro-arc oxidation treatment can obviously enhance the hydrophilicity of pure zinc surface, and the film structure can be changed by adjusting different technological parameters of the micro-arc oxidation, so as to optimize its wettability and corrosion resistance.更多还原