A new anodizing process at low AC voltage (10 V) was used to prepare an electrochemical anodized film on AZ91D magnesium alloy in the electrolyte containing NaOH and Na2SiO3. A scanning electron microscope (SEM) with an energy dispersive X-ray spectroscopy (EDS) system was used to study the characteristics of the film-forming and growth process of the anodizing oxidation film on the AZ91D magnesium alloy. The influence of the parameters of oxidation process on film growth process and the properties of the film were also investigated by using an X-ray diffractometer (XRD) and electrochemical analyzer. It is found that the oxidation film on the AZ91D magnesium is even, non-porous and flat-shape. The growth process of oxidation film show superposition-type and the phase composition of the oxidation film is mainly Mg2SiO4. In addition, the corrosion resistance of anodic film on the AZ91D magnesium alloy is superior to the blank sample in 3.5%(mass fraction)NaCl solution.
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