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UDC 621.762 The tribological and corrosive characteristics of binary and ternary alloys electrodeposited from CoW, FeW, CoMoP, and CoWP citrate solutions are studied. The tungsten content of CoW alloys reaches 31 at.% and of FeW alloys 34 at.%. The introduction of phosphorus into the alloys reduces the content of tungsten from 26.7 to 19.7 at.% (at 4.5 at.% P). The molybdenum content of CoMoP alloys is 0.7-1.0 at.% at 5 to 8 at.% P. The electrolytic tungsten alloys are nanocrystalline and subgrains are 4 to 7 nm in size. The nanohardness of tungsten-rich alloys (∼13 GPa) is comparable with that of electrolytic chromium coatings. The wear resistance of the deposited alloys is quite high and is commensurable with that of hard coatings such as TiB 2 , TiN, and TiAlN. The tribooxidation of FeW alloys in dry friction is revealed. The corrosion resistance of the coatings is similar to that for electrolytic chromium.

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Iron-tungsten alloys were obtained from citrate electrolytes. The relation between Fe(II) and Fe(III), which permits maintaining the stability of an electrolyte as well as obtaining high-quality deposits for a long time, is revealed. The results of investigations show that the discharge of iron ions takes place from the three valent ions. It is found that the concentration of sodium tungstate in the electrolyte contributes to the codeposition of tungsten, increasing its ratio in the alloy. It is established that the current efficiency and composition of iron-tungsten coatings depend on the current density and the conditions of electrolysis. The microhardness of iron-tungsten deposits increases with an increase in the deposition temperature and depends on the tungsten content in the alloy. Investigations with an electron microscope have shown that, on the alloy surface, superficial inhomogeneous films with the content of tungsten and oxygen different from that in the deposit are formed. The obtained alloys have concentration and structure inhomogeneities.

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The experimental data obtained at various parameters of an inductance-capacitor device are presented. It is possible to change the kinetics and efficiency of the chromium plating process by varying the inductance L and the capacity C of the device while keeping the other conditions of the electrolysis identical.

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