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The mechanism and kinetics of anodic oxidation of the Ni-Si electrode in solutions of 0.5 M H 2 SO 4 + (0,005 -0,05)M NaF in the passive state were investigated by methods of polarization and impedance measurements. The impedance spectra are interpreted on the assumption about the formation of the bilayer oxide film on the surface of the silicide nickel, the outer layer which has a porous structure. The growth of the porous layer with the increase of the electrode potential in the investigated solutions is linearly (constant anodizing is 2.2 nm/V). The increase in NaF concentration leads to a decrease in the thickness of the porous layer. The growth of the barrier layer of the oxide film was described in the framework of the model of point defects. The diffusion coefficient of oxygen vacancies inside the barrier layer of the film is 8.5 · 10 Keywords: the method of impedance measurements; two layer oxid; metal monosilicic. *The work is executed at financial support of RFBR under research project No. 14-03-31016.