LAUSR

We study the influence of the concentrations of the components of citrate electrolytes based on Fe(III) and the modes of electrolysis on the composition of the Fe–Co–Mo, Fe–Co–W, and Fe–Mo–W coatings. It is shown that the formation of ternary alloys is realized by the mechanism of competitive reduction of cobalt and tungsten (molybdenum) with iron. As the concentration of a ligand increases, the coating is enriched with a refractory component. However, the opposite trend is observed as the current density increases. The application of the pulsed electrolysis makes it possible to increase the rate of the process and to enhance the current efficiency by 70–75%. The dependence of the morphology of deposits on the nature and content of refractory components is determined by the methods of scanning electron microscopy and X-ray diffraction spectral microanalysis. The influence of the compositions of ternary coatings on their corrosion resistance in media with different acidities and on the catalytic activity in the electrochemical reaction of hydrogen release is analyzed. By the methods of polarization resistance and electrode impedance spectroscopy, it is established that the corrosion resistance of the coatings is higher than for the substrate material by 1.3–2.0 orders of magnitude. The dependence of the nature of corrosion inhibition on the composition of electrolytic alloys is investigated.