This report describes the features of the macroscopic size (size-technological) effect of microhardness electrolytic coatings of Сo-W, Ni-W and Fe-W alloys. The microhardness of such coatings at a fixed electrodeposition current density also depends on the surface area on which the coating is deposited [1], on the other hand at a fixed current density and surface area microhardness depends of the electrolyte volume from which the electrodeposition is carried out [2].  It is shown that this feature is absent in classical processes of chromium electrodeposition from standard electrolyte or nickel electrodeposition from the Watts bath, but occurs when Co-W, Ni-W and Fe-W coatings are electrodeposited from citrated and gluconate solutions [2], both from relatively concentrated , and diluted [1-3].  The presence of the above-described effect is manifested in the fact that for a fixed current density of electrodeposition, the microhardness is also determined by the value of the volume current density (VCD), with the growth of which it decreases [1-4]. It is shown that the decrease in microhardness with increasing of VCD is determined primarily by the change in the structure of the coating [2], which is also marked in a morphology changes [4].  The change in the structure of the coating during the VCD increasing is not accompanied by a change electrodeposition potential. The observed effects can be explained on the basis of the mechanism of induced codeposition of the investigated alloys, the first stage of which is the electrodeposition of a complex (citrate, gluconate) metal precipitant (metal of the iron group) with the formation of an intermediate, the further reduction of which occurs with the participation of a multivalent anion with the formation of an alloy [5].  At a high rate of change in the concentration of the metal precipitant (high values of the VCD), a shift of equilibrium towards the formation of a composite is possible, which also includes oxide (hydroxide) of the precipitating metal, resulting in a decrease in microhardness [6].