The paper is devoted to a study on nickel electrodeposition under an external applied constant magnetic field. The deposit structure was compared for the three different models: electrodeposition without the magnetic field application, that in a constant homogeneous magnetic field up to 5 kOe, and that in a constant higradient magnetic field. The arborous dendritic structure was obtained under influence of a gradient magnetic field while the smooth structures were observed in a homogeneous magnetic field as well as for electrodeposition without magnetic field application. Influence of a gradient magnetic force on microstructure of the deposits is discussed.

We propose a new method for determining the frequency characteristics of the rotational motion of an electrolyte flow during electrochemical reactions under the influence of an external magnetic field. The main advantage of the proposed method is the possibility to determine the frequency characteristics without introducing marker particles or other changes in the electrolyte or in the nature of the reaction. The effectiveness of this method is demonstrated by measuring the electrolyte rotation frequencies during the corrosion of a steel ball in an external magnetic field. It is shown that at the chosen experimental conditions the typical electrolyte rotation frequencies during etching of the steel ball are 0.88 and 1.7 Hz. The developed method can be used for determining corrosion areas of metallic compounds via in situ testing.

This paper reports the results of studying the application of a ferritization method for the integrated purification of used etching solutions. A feature of this work is the use of energy-saving activation of the process by alternating magnetic fields. Its advantages are shown in comparison with traditional thermal activation. The influence of magnetic induction amplitude and key technological parameters of ferritization on the quality of cleaning an etching solution has been studied. The qualitative and quantitative composition of sediments obtained after the ferritization of etching solutions was investigated. Used etching solutions are large-tonnage waste of industrial enterprises. They contain harmful pollutants that have a detrimental effect on the environment. It is promising to treat these solutions in order to obtain valuable commodity products. It is established that with an optimal value of magnetic induction amplitude of 0.1 Tl, the degree of extraction of iron ions from the solution reaches a value of 99.99 %. The best values for the main technological parameters of the process have been determined: the concentration of iron ions in the reaction mixture is 6.6 g/dm3; pH, 11.5; the duration of ferritization is 15 min. The residual concentration of iron ions in purified solutions does not exceed 0.3 mg/dm3. Thus, according to the norms of current standards, they can be reused in production. Comparative analysis indicates the advantages of electromagnetic activation of the reaction mixture. The phases of magnetite Fe3O4 and iron monohydrate δ ‒ FeOОН were detected by the method of X-ray phase analysis in ferritization sediments. It is established that with an amplitude of 0.1 Tl, the sediment contains only magnetite. The study's results indicate the possibility of further use of sediments for the manufacture of important ferromagnetic substances. The application of the improved ferritization process in production will achieve less energy consumption compared to well-known processing technologies