The ability to control the roughness of the formed deposits with the provision of the leveling ability of the workpieces is important for obtaining dimensional sealed galvanic coatings when restoring power hydraulic equipment. A model that describes the process of convective diffusion of composite particles into the galvanic matrix of the formed coating is considered. It is established that the presented problem can be described by the classical Laplace equation. However, the analytical solution in the existing formulation isn’t integrated in quadratures. The numerical method described by Watson and Edwards was used. It allows to get a connection between the electrical characteristics of the field due to the decomposition of the secondary electric field into the primary field and the polarization field. It is assumed that the diffusion of the leveling additive occurs in a field similar to the primary electric field, and the concentration of the additive directly at the electrode surface is constant and equal to zero. A qualitative agreement between the calculated leveling ability and the experimentally found values for the chromium electrolyte was established when determining the amount of the leveling additive from the potential-concentration curves at a constant current strength. The dependences obtained in the course of the study indicate the exponential nature of the change in the microprofile of the formed galvanic coating with the time of electrolysis, both in the case of positive and negative equalization. This is confirmed by a lot of experimental data concerning the development of roughness in the case of diffusion restrictions. The proposed algorithm is stated quite clearly, which makes it possible to automate it for the production of practical calculations on the numerical integration of a system of differential equations in partial derivatives using a computer.