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采用含硅酸钠14g/L、氟化钠14g/L、氢氧化钠2g/L和甘油5mL/L的电解液,以微弧氧化技术在ZE10镁合金的表面成功制备了微弧氧化膜。采用涡流测厚仪、扫描电镜、X射线衍射、电化学工作站等,研究了电压和时间对镁合金微弧氧化膜的厚度、表面形貌和耐蚀性的影响。结果表明,微弧氧化膜层主要由MgO、MgF2和Mg2SiO4及少量非晶态物质组成。随着电压的增大,膜层不断增厚。随着氧化时间的延长,膜厚迅速增加,20min后膜层厚度基本稳定。微弧氧化膜的耐蚀性随着电压的增大和时间的延长均呈现先增强后降低的趋势。脉冲占空比和频率对膜层的耐蚀性也有一定的影响。
The micro-arc oxidation film was successfully prepared on the surface of ZE10 magnesium alloy by using micro-arc oxidation technology with electrolyte containing 14g / L sodium silicate, 14g / L sodium fluoride, 2g / L sodium hydroxide and 5mL / L glycerol. The effects of voltage and time on the thickness, surface morphology and corrosion resistance of MAO coatings were investigated by using eddy current thickness gauge, scanning electron microscopy, X-ray diffraction and electrochemical workstation. The results show that the MAO coatings consist mainly of MgO, MgF2 and Mg2SiO4 and a small amount of amorphous materials. As the voltage increases, the film continues to thicken. With the extension of oxidation time, the film thickness increased rapidly, and the thickness of the film was basically stable after 20 minutes. The corrosion resistance of MAO films shows the trend of first increasing and then decreasing with the increase of voltage and time. Pulse duty cycle and frequency of the corrosion resistance of the film also have a certain impact.