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采用硅溶胶对AZ31镁合金阳极氧化膜进行封孔处理。分别讨论了浸渍时间、焙烧温度及浸渍焙烧次数对氧化膜形貌及抗腐蚀性能的影响。使用扫描电子显微镜(SEM)分析复合膜的表面形貌,利用动电位极化曲线表征膜的腐蚀性能。采用能谱(EDS)和X射线光电子能谱表征封孔后膜的表面组成。结果表明,硅溶胶封孔可提高阳极氧化膜的抗腐蚀性能;浸渍时间为1.5 min,焙烧温度为350℃时,膜的耐腐蚀性能最佳;浸渍-焙烧次数对膜的性能影响也较大,浸渍-焙烧7次时,膜的耐腐蚀性能较好。封孔后,硅溶胶吸附于阳极氧化膜的孔外与孔内。
AZ31 magnesium alloy anodized film was sealed with silica sol. The effects of impregnation time, calcination temperature and the number of impregnation and calcination on the morphologies and corrosion resistance of oxide films were discussed respectively. The surface morphology of the composite films was analyzed by scanning electron microscopy (SEM), and the corrosion potential of the films was characterized by potentiodynamic polarization curves. The surface composition of the membrane after sealing was characterized by energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy. The results show that the sealing performance of the silica sol can improve the corrosion resistance of the anodized film. When the immersion time is 1.5 min and the calcination temperature is 350 ℃, the corrosion resistance of the film is the best. , Dipping - roasting 7 times, the corrosion resistance of the film better. After sealing, the silica sol is adsorbed on the outside of the pores of the anodized film and in the pores.