Induced co-deposition of refractory metals (W, Мо) with the iron group metals (Fe, Со, Ni) under specified conditions makes it possible to form amorphous (nano-crystalline) coatings with outstanding magnetic, anti-corrosive and mechanical properties.  Currently, a lot of specialists have been trying to find the best electrolyte for obtaining Co-W alloys. One of the variants is the gluconate electrolyte as suggested in [1]. Still, practical applications of these electrolytes are mostly dependent of the fact whether their properties are retained (or changed) during a long-time processing of the electrolytes.  Electrolyte coatings were deposited on cylindrical brass samples covered with a sub-layer of nickel (1µm), average current density of 2 А/dm2, the rotation rate 0-570RPM, the volume temperature of the solution 60°, 80°С, in an electrochemical cell with unseparated anode and cathode chambers. Adjustment of the electrolyte was made with the addition of solutions of Co and W salts after every 1А∙h/l of work.  Depending on the degree of the electrolyte processing  (up to 8 А∙h/l), under study were the composition of the electrolyte, the composition and morphology of the layers obtained, current yield, and micro-hardness of coatings.  The influence of hydrodynamic conditions and the degree of the electrolyte processing on the composition and mechanical properties of the surface is demonstrated. The higher the rate of the electrolyte processing (without its adjustment), the higher the concentration of W in the surface coating and the lower its microhardness and the current efficiency. It is explained by a higher degree of the Co ions reduction  and change in the ratio Co-W in the electrolyte. It is shown that the adjustment of the electrolyte allows for maintaining the value of the current efficiency, throwing power, surface microhardness even during a long-time processing.