in Figure (pH1_CV_ 90). Comparison of the results suggests that the pH of electrolyte significantly affects the composition of the formed film. In a more acidic environment the precipitate with a high percentage of Mn +4 is deposited. This film contains the hydrolyzed form MnO(OH), but in a smaller amount compared to other samples. This is explained by inhibition of hydrolysis at pH1. The composition of the film deposited under the same conditions, but dried at a higher temperature, has changed significantly. We found a higher concentration of Mn +3 and a significant increase the concentration of hydrolyzed particles. It is likely that this effect is achieved due to the presence of Mn +2 particles, adsorbed on the surface of the deposit during the electrodeposition process. They interact with Mn +4 and form MnO(OH) according to reaction (6) .