The present work concerns analysis of the possibilities of synthesis of Ni-TiO2 composite coatings from electrolytes containing formate nickel complexes. A magnetic field was applied as an additional factor enabling modification of properties of the synthesized coatings through its influence on electrode processes. The presented data describes the effect of electrode potential, TiO2 concentration in the electrolyte as well as the value of the magnetic field induction vector on the deposition rate, composition, current efficiency, structure, surface states and morphology of synthesized coatings. The studies were preceded by thermodynamic analysis of the electrolyte. The obtained results indicated possibilities of synthesis of composites containing up to 0.97 wt. % of TiO2. Depending on applied electrolysis conditions current efficiency amounted to from 61.2 to 75.1%.

The report presents research efforts on the synthesis of Zn/MoS2 composite coatings by electrochemical reduction from a sulphate-borate bath containing MoS2 powder as a dispersion phase at various concentrations. The structure of the Zn/MoS2 composite coatings was characterised and the effect of MoS2 particles embedded on their microhardness was evaluated. The coatings produced are characterized by a compact, homogeneous structure and a good connection to a steel substrate. The incorporation of MoS2 particles into the zinc matrix has an influence on the structure and morphology of the Zn/MoS2 composite coatings. It was found that the presence of MoS2 particles increases surface roughness along with coating hardness. The incorporation of the MoS2 particles into the zinc matrix slightly improves the corrosion resistance compared to Zn coatings, making the corrosion potential shift towards more electropositive values.

The paper presents the results of research on nanocomposite nickel/graphene oxide (Ni / GO) coatings produced by electrochemical reduction method on a steel substrate. Discussed is the method of manufacturing composite coatings with nickel matrix and embedded graphene oxide flakes. For comparative purposes, the studies also included a nanocrystalline Ni coating without embedded graphene oxide flakes. Graphene oxide was characterized by Raman spectroscopy, infrared spectroscopy (FTIR) and transmission (TEM) and scanning (SEM) electron microscopy. Results of studies on the structure of nickel and composite Ni/GO coatings deposited in a bath containing different amount of graphene oxide are presented. The coatings were characterized by scanning electron microscopy, light microscopy, Raman spectroscopy and X-ray diffraction. The adhesion of the prepared coatings to the substrate was examined by the scratch method. The microhardness of the coatings was measured using the Vickers method on perpendicular cross-sections to the surface. Corrosion tests of the coatings were investigated using the potentiodynamic method. The influence of graphene oxide on the structure and properties of composite coatings deposited from baths with different content of graphene oxide was determined.

The effect of cationic, anionic and nonionic surface active additives, organic compounds and polymers on the electrodeposition of Zn-Mo coatings on steel substrate and detailed characterization in chosen optimal conditions was studied. The influence of polyethylene glycol (PEG) various concentration, sodium dodecyl sulphate (SDS), triton X-100, d-sorbitol, cetyl trimethyl ammonium bromide (CTAB), thiourea and disodium ethylenediaminetetraacetate (EDTA) on the electrodeposition process was examined. The composition of deposits was defined by wavelength dispersive X-ray fluorescence spectrometry (WDXRF). Results has shown that the current efficiency of the electrodeposition of Zn-Mo coatings is 71.4%, 70.7%, 66.7% for 1.5 g/dm3 PEG 20000, 0.1 g/dm3 Triton X-100 and 0.75 M D-sorbitol respectively. The surface topography and roughness of selected coatings on steel was investigated by atomic force microscopy (AFM). The attendance of D-sorbitol of 0.75 M in the solution cause clear reduction of grain size and the value of roughness parameter (Ra) in relation to SDS, PEG, Triton X-100 and the sample prepared without the additives. The morphology of electrodeposited layers was studied by scanning electron microscopy (SEM). The addition of selected additives to the electrolytic bath results in the formation of smoother, brighter and more compact Zn-Mo coatings in comparison to layers obtained from similar electrolytes but without the addition of surfactants. The optimal concentration of the most effective additives such as PEG 20000, Triton X-100 and D-sorbitol is 1.5 g/dm3, 0.1 g/dm3, 0.75 M respectively.

This work presents the studies on the electrochemical process of thin palladium layers formation onto electrodeposited cobalt coatings. The suggested methodology consists of the preparation of thick and smooth cobalt substrate via galvanostatic electrodeposition. Cobalt coatings were prepared under different cathodic current density conditions from acidic bath containing cobalt sulphate and addition of boric acid. Obtained cobalt layers were analyzed by x-ray diffraction to determine their phase composition. Freshly prepared cobalt coatings were modificated by the galvanic displacement method in PdCl2 solution, to obtain smooth and compact Pd layer. The comparison of electrocatalytic properties of Co coatings with Co/Pd ones enabled to determine the influence of Palladium presence in cathodic deposits on the hydrogen evolution process.

In this study, molten salt electrorefining was used to recover indium metal from In-Sn crude metal sourced from indium tin oxide (ITO) scrap. The electrolyte used was a mixture of eutectic LiF-KF salt and InF3 initiator, melted and operated at 700°C. Voltammetric analysis was performed to optimize InF3 content in the electrolyte, and cyclic voltammetry (CV) was used to determine the redox potentials of In metal and the electrolyte. The optimum initiator concentration was 7 wt% of InF3, at which the diffusion coefficients were saturated. The reduction potential was controlled by applying constant current densities of 5, 10, and 15 mA/cm2 using chronopotentiometry (CP) techniques. In metal from the In-Sn crude melt was deposited on the cathode surface and was collected in an alumina crucible.