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在硅酸盐电解液中添加稀土二氧化铈(Ce O2)颗粒,采用恒流模式在2A12铝合金表面制备陶瓷膜层。通过扫描电子显微镜、X射线衍射仪、粗糙度仪、硬度计、极化曲线等手段研究Ce O2颗粒对2A12铝合金微弧氧化陶瓷膜层微观形貌、组织、粗糙度、硬度和耐蚀性的影响。实验结果表明:添加Ce O2使膜层表面微孔直径减小,膜层粗糙度下降,厚度增加。Ce O2颗粒进入膜层中大部分以Ce O2化合物沉积形式存在,微量Ce O2参与反应以Ce O、Ce Al11O8化合物形式存在。Ce O2颗粒具有促进γ-Al2O3向α-Al2O3转变的作用,从而提高了膜层的硬度。当Ce O2浓度为3~4 g/L时膜层耐蚀性能较好。
The rare earth cerium oxide (Ce O2) particles were added to the silicate electrolyte, and the ceramic film was prepared on the surface of 2A12 aluminum alloy by constant current mode. The effects of Ce O2 particles on the microstructure, microstructure, roughness, hardness and corrosion resistance of 2A12 aluminum alloy micro-arc oxidation ceramic coating were studied by means of scanning electron microscope, X-ray diffraction, roughness meter, hardness tester and polarization curve Impact. The experimental results show that the addition of Ce O2 decreases the diameter of the micropores on the surface of the film, the roughness of the film decreases and the thickness increases. Ce O2 particles into the film most of the deposition of Ce O2 compounds exist, a small amount of Ce O2 involved in the reaction as Ce O, Ce Al11O8 compounds exist. Ce O2 particles have the function of promoting the transformation of γ-Al2O3 to α-Al2O3, thereby increasing the hardness of the film. When Ce O2 concentration of 3 ~ 4 g / L when the corrosion resistance of the film better.