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《Journal of Beijing University of Aeronautics and Astronautics》 2008-02
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Behavior of silica sol during the anodizing process of magnesium alloy

Li Yihong Zhu Liqun Liu Huicong Chen Yichi(School of Materials Science and Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100083,China)  
Anodic films were prepared on AZ91D magnesium alloy and Mg-Li alloy separately in 150 g/L NaOH and 1.0 mol/L Na2SiO3 with varied silica sol addition.The conductivity of the solution and the surface morphologies of the anodic films were characterized by conductivity instrument(DDS-307) and scanning electron microscopy(SEM).The solution's conductivity would become small with the silica sol addition.The energy dispersion spectrometry(EDS),the thickness and the X-ray diffraction(XRD) of the films were also investigated.Results show that the thickness of the anodic film increases linearly with the addition of silica sol in both solutions and mainly depends on the anodizing break voltage which is affected by the solution's conductivity and the resistance of the magnesium/solution interface.The sol particles take part in the anodizing reaction process.The silica sol reacts with MgO and the product is Mg2SiO4.
【Fund】: 航空基金资助项目(04H51002)
【CateGory Index】: TG174.4
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