Özet:

The features of the formation of iron multi-component coatings with refractory metals (molybdenum and tungsten) from citrate electrolytes based on iron(III) on substrates made of gray cast iron SCH18 are studied. It is shown that the electrolysis mode and the density of cathodic polarization effect on the current efficiency, the content of alloying elements in coatings and their distribution over the surface, allowing to control electrodeposition process. It is found that with increasing current density coatings are enriched with alloying components while increasing the porosity as a result of the intensification of hydrogen release. Rational intervals of current densities are determined for galvanostatic regime and pulse polarization regime for formation of iron-molybdenum and iron-molybdenum-tungsten coatings with a high content of alloying elements, the output flow is up to 85 % and coating deposition rate of 25-30 µm/h. It is shown that the addition of the refractory metals in the thin film results in an amorphous coating structure and formation of extended microglobular surface consisting of grains of various sizes. It is found that a high degree of surface extension and substantial contents of tungsten and molybdenum provide high wear resistance performance and corrosion resistance, and low friction coefficient compared with the substrate material. These materials can be used as reinforcement and protection in a variety of industries. Author Biography Анна Владимировна Каракуркчи, National Technical University «Kharkіv Polytechnic Institute», Kyrpychova str., 2, Kharkiv, Ukraine, 61002 PhD, Head of Research Laboratory

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