Sol-gel sealing fluids for sealing anodized films of aluminum alloy were fabricated. The effects of triethyl phosphate on performance of anodized films with sol-gel sealing on aluminum alloy were studied. The morphology of the films was obtained by scanning electron microscopy (SEM). The effects of triethyl phosphate concentration on corrosion resistance of anodized films was investigated by electrochemical impedance spectroscopy (EIS) and salt spray test. The adhesive force between the coating and the anodized films was estimated by scribe test, and the mechanism of corrosion inhibition and sealing evaluated. The results demonstrate that the optimal concentration of triethyl phosphate is 2% (mass fraction), which makes the films uniform and dense; and demonstrate excellent corrosion resistance.