Effect of sol ingredient to anodic oxidation film on magnesium alloys

According to the usual condition for anodic oxidation on AZ91D magnesium alloys, anodic oxidation film was made at the voltage of 60-70 V (AC) by dropping silicon-aluminum sol into alkaline anodic oxidation solution, and the rate of added sol to basic solution was 0%-5%. The prepared film was tested by measuring the thickness and observing the microcosmic surface and cross section image, and the results show that the sol ingredient can enhance the thickness of anodic oxidation film effectively and the compact degree of the film on magnesium alloys. At the same time, due to the effect of silicon-aluminum sol, the rate of the forming films has the stage of rapid and slow development. While adding sol into the solution has little effect on X-ray diffractive image of anodic oxidation film.