Karakurkchi G. Electrochemical formation of functional coatings of iron alloys with molybdenum and tungsten

The subject of this research is the ionic equilibrium in the electrolyte volume as well as chemical and electrochemical processes near electrode layer, occurring during co-deposition of iron with molybdenum and tungsten. The purpose of research is development of electrochemical technologies for iron alloys with molybdenum and tungsten functional coatings formation to increase corrosion resistance, mechanical and tribological characteristics of the steel and cast iron surface. Research methods are linear voltammetry, X-ray fluorescence, X-ray and electron microprobe analysis and scanning atomic force microscopy, polarization resistance method, gravimetry and tribological. Theoretical and practice results are established mechanism of coating Fe-Mo and Fe-Mo-W deposition; developed a scheme of technology process for multicomponent coatings obtaining. The novelty are kinetic laws and stages of the process of co-deposition of iron with molybdenum and tungsten from citrate solutions based on iron (III), electrolytes composition and modes of electrolysis were developed to produce coatings with high corrosion resistance, physical-mechanical and tribological properties. The realization degree consists of laboratory-scale tests of electrolytes and electrolysis modes at CL SP "Zavod Malysheva", Kharkov; the functional properties of the coatings tested CL SP "Zavod Malysheva" and SRECC at GU MVD of Ukraine in Kharkiv region. The branch of the research application is the technology of surface hardening and restoration of worn surfaces, electrochemical technology industries, research institutions and the educational process.