Using the method of polarization curves (E–lgIa), the kinetics of the anodic processes during the electrolytic codeposition of MnO2 and chromium oxides is studied. It is found that the codeposition of chromium oxides leads to a substantial reduction in the current efficiency and the rate of formation of the basic anodic product. The structure of the combined residues of Mn and Cr formed on the anode considerably differs from the structure of MnO2, which is shown in the reduction in the size of the crystalline grains with their simultaneous transformation into a columnar configuration. The formation of a columnar (filamentary) structure is explained by the advanced nucleation and growth of the MnO2 crystals, the development of which along the surface of the base is hindered by molecules and microcrystalline aggregates of chromium oxide compounds. Owing to this, the resulting grain grows normal to the substrate surface via the superposition of two dimensional MnO2 nuclei.