Sknar I. Electrodeposition of nickel and its alloys from methanesulfonic electrolytes

Object of research - electrochemical processes occurring in electrodeposition of nickel and alloys Ni-Fe from methanesulfonic electrolytes. The aim of the research - foundation of mechanism of electroreduction of nickel(ІІ) ions and characteristics of electrodeposition of alloy Ni-Fe from methanesulfonic electrolytes; the identification of the influence of sulfur-containing organic compounds on the kinetics of electrodeposition of nickel and alloys Ni-Fe, the structure and physico-mechanical properties of nickel and nickel-iron coatings. Research methods. Voltamperometry, chronoamperometry (kinetics of electrochemical processes). X-ray fluorescence, X-ray analysis, scanning electron microscopy (chemical composition, structure and morphology of coatings). Potentiometry, spectrophotometry, gravimetry, volumetric methods of analysis (the composition of electrolytes and alloy Ni-Fe). Method of the flexible cathode, method print diamond pyramid (the properties of the coatings). Theoretical and practical results, their novelty. A new mechanism of electroreduction of nickel(II) ions which includes two parallel route: at low overpotentials prevails reaction of electroreduction of nickel(II) ions takes place with participation of hydroxycomplex, at high overpotentials prevails electroreduction of nickel(II) ions takes place with participation of aquacomplexes was proposed. For the first time found that electrodeposition of nickel-iron alloys from methanesulfonic electrolyte takes place in conditions of inhibiting of electroreduction of nickel(II) ions while accelerating the deposition of iron in the alloy. For the first time proposed the principle of management of the properties of nickel coatings, which lies in the fact that in the electrolyte introduces such sulfur-containing organic compounds, which provide integration of sulphur in the crystal lattice of nickel. The scientific basis for new technologies of electrodeposition thick and decorative coatings on the basis of nickel with low stresses was developed. The sphere of use. The dissertation contains new scientific results, which are essential for electrochemistry.