Abstract The work specifies the distribution features of electromagnetic and hydrodynamic fields in the conductive electric-current treatment of melts by parallel electrodes via the methods of numerical experiments. It was shown that it is possible to create local areas of concentration of the electromagnetic field, to avoid the flow of current through the electrode walls, and to increase the treatment

Abstract— The paper presents the study results on the influence of the alternating current’s frequency on the value of active resistance. It has been revealed that the value of the active resistance increases to a minimum value with an increase in the frequency of the alternating field, and it increases sharply with a further increase in the frequency. It is shown that the cause of the growth of active

Abstract— This paper presents the results into the study of electret properties of composite materials based on ultrahigh molecular weight polyethylene (UHMWPE) and nano-dispersed amorphous silica filler α-SiO2 (aerosil) depending on the volume content of silicon dioxide and the absorbed dose D γ-irradiation at room temperature using the method of thermally stimulated depolarization (TSD). It was found

Abstract Powders of VT3-1 titanium alloy and VK-15 hard alloy have been obtained and investigated. A proposal is suggested for the possibility of their industrial use, especially for surface spraying. High efficiency methods and apparatuses are suggested to produce metal powders using an electric arc in the cross hydrodynamic flow of the working liquid that burns without a pause. They make it possible

Abstract— This work formulated and solved the problem of determining the specific electrical conductivity of plasma in the channel of the electrical discharge in water as well as that of the discharge channel resistance taking into account the deviation in its shape from that of a straight circular cylinder. The closing ratios and empirical functions whose parameters agree with the experimental data

Abstract Using the atomic force microscopy method, the surface of thin, copper-containing polyacrylonitrile (PAN) films is studied. The distribution function over the height of the surface profile is analyzed by the method of multifractal detrended fluctuation analysis (MFDFA). The fractal dimension, correlation dimension, scaling exponent, and Hurst exponent (H) are used as parameters in this analysis

Abstract The investigation results for the fine dispersion of the prerefined oxides of rare-earth elements using electric discharges in an aqueous medium are presented. A possibility of producing oxide particles with a size less than 1 μm is shown, including the generation of those particles from large blocks of previously coagulated oxide particles. It is shown to be reasonable to choose such an interposition

Abstract— The work highlights the results of application of a bio polymer glycogen as a green inhibitor for the corrosion control of 6061Al-15%(V)SiC(P) composite material in 3.5% NaCl medium. The corrosion rate measurements were done by electrochemical methods such as potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS). Kinetic and thermodynamic parameters were calculated

Abstract The paper reports the oxidative decolorization of the direct blue 14 (DB-14) dye in an aqueous phase via an ecologically friendly electrochemical advanced oxidation process. The investigation of several experimental conditions such as the solution pH, initial concentrations of the oxidant, the dye, and current density was carried out in a single-compartment electrolytic cell with the use of

Abstract— The dispersion equation is derived analytically and in a linear approximation using the dimensionless amplitude of oscillations for capillary waves on the charged surface of a layer of viscous conductive liquid on a metal wire. The metal wire is shown to stabilize the capillary waves. The wire effect becomes substantial only at high values of the wire radius. The appearance of the electric

Abstract An electrochemical study of three API steels: X52, X65, and X80, exposed to seawater and sediment from seabed is presented. Two seabed samples were collected at 60 meters depth near a platform (seabed A) and at a distance of 500 m (seabed B) from the same platform of the Sonda of Campeche, México. In both samples, the seawater and sediment were separated in order to characterize their corrosiveness

Abstract The purpose of this study was to investigate the role of different welding techniques: laser and tungsten inert gas (TIG) on the corrosion behavior of commercially pure titanium (cp-Ti) frameworks in dentistry. Electrochemical tests were conducted in artificial saliva at pH 7.2, 37°C. The surfaces were examined using scanning electron microscopy. The received data were analyzed by one-way

Abstract— Commercially pure titanium Cp-Ti and Ti6Al4V alloy were liquid borided using a borate bath consisting of 70% borax and 30% SiC at 1000°C for 3, 6, and 12 h. The borided materials were characterized by scanning electron microscopy to reveal the produced microstructures. Two kinds of titanium borides were identified by the X-ray diffraction analysis (TiB2 on the top of the surface followed

Abstract— The existence of the phenomenon of electrochemical phase formation in metals and alloys via a supercooled liquid state stage has been discussed. In the second part of the research, the results of the precision X-ray phase analysis for the interface between electrodepositing alloy in the form of a substitutional solid solution and a cathode of Wood’s alloy that persisted in either a solid

Abstract— In order to better integrate 316 L stainless steel implants, in this study, hydroxyapatite/chitosan (HA/CS) nanocomposite coatings, barium titanate/chitosan (BT/CS), and hydroxyapatite/barium titanate/chitosan (HA/BT/CS) were applied on the mentioned steel via electrophoretic deposition at 10 V for 150 s. Tri-ethanolamine was used as a dispersant to create a stable suspension. The microstructure

Abstract— This research is done with the purpose of revealing an increase in the fatigue performance of carbo-nitrided powertrain shafts followed by the second tempering. The fatigue test was conducted at a bi-directional torsional cyclic load using an MTS torque tester. Various investigations were carried out to find out the effect of surface roughness, second tempering, inter granular oxidation,

Abstract Further to traditional corrosion monitoring techniques for rated deteriorations, nowadays modern electrochemical monitoring methods are promising for the control of non-rated damage mechanisms. Considering carbon steel as the most commonly used alloy in the oil and gas industry, there are special grades under NACE MR0175 standard which are immune to sour corrosion. However, according to the

Abstract Various aspects of the ultrasonic field effect on the technological characteristics of the electrical discharge drilling of small-diameter holes are studied. An increase in process stability increase upon ultrasonic field application is found, and a decrease in the scattering field of machining time values is determined. The quantitative estimation of productivity improvement is performed

Abstract The effects of electric field strength and interelectrode distance on the main parameters of boiling under conditions of electrohydrodynamic flow have been studied. It has been found that the field effect exhibits a decrease with increasing heat flux density. The optimum interelectrode distance corresponding to the most intense heat transfer has been determined. Based on visual observations

Abstract The tribological and electrochemical properties of various nanocomposite coatings of Ni–P–MoS2–SiO2 have been investigated. Such coatings were made by the electroless method and then heated at 400°C for 1 h. The amount of SiO2 nanoparticles was a factor which changed Ni–P–MoS2 coatings characteristics. In addition to microstructure evaluations and the phase detection, the microhardness, the

Abstract Ultrafiltration polysulfonamide (PSA) membranes with a molecular weight cutoff of 100 kDa have been treated in a unipolar corona discharge field in an air atmosphere at varying voltage (5, 15, 25, and 35 kV) and corona discharge treatment times (1, 3, and 5 min). Using instrumental methods of analysis, it has been revealed that the treatment leads to changes in the surface structure of the

Abstract The influence of the electrodeposition potential on the compositional, magnetic, and microstructural properties of CoFe alloy thin films grown on a Cu sputtered silicon substrate was studied. Grazing incidence X-ray diffraction results indicate a diffraction peak at 2θ ≈ 45° related to (110) plane of a body-centered cubic structure of CoFe alloy. Field emission scanning electron microscopy

Abstract In the present paper, Fe3O4@SiO2/GO nanocomposite was synthesized and used to modify a graphite screen-printed electrode. This modified electrode was used to determine levodopa in the presence of tryptophan. Differential pulse voltammetry data showed that the obtained anodic peak currents were linearly dependent on levodopa concentrations in a range of 0.5–800.0 µM, with the detection limit

Abstract The complex of methods necessary to experimentally study the effect of the deformation rate on the high strength sheet steels (as exemplified by DP780, DP980, and BH240 steels) on the increase in their plasticity during uniaxial and biaxial stretching is determined. The deformation rates of steels were measured in a wide range from 10–4 to 17 × 103 s–1. An FP 10/1 HECKERT tensile testing machine

Abstract The medicinal compound antifebrin was prepared in the laboratory via one stage (green method) by using aniline, glacial acetic acid, and zinc dust. The investigation was aimed at ascertain a possibility of utilizing the medicinal compound to originate a corrosion inhibitor for Al in a 3 M HCl solution. In the present article, the usefulness of antifebrin to inhibit the Al corrosion in 3 M

Abstract Using the framework of the classical theory of nucleation, main cluster sizes occurring in the course of electrodeposition are determined. The problem is also considered from the standpoint of Cahn–Hillard theory. The focus is on the qualitative estimation of particle sizes in the course of nanonucleation.

Abstract— V2O5 thin layers are electrodeposited on a stainless steel (Type 18N12Kh9T) anode from an aqueous metavanadate solution. The oxide deposits are subjected to thermal treatment at 300 or 500°C and tested in a redox reaction with lithium. The findings are compared to the behavior of similar deposits obtained from a vanadium oxysulfate solution. The use of prepared deposits in thin-film lithium

Abstract The performance of five synthesised phosphonium salts, 4-tolyltriphenyl-phosphonium chloride (TTPPC), 4-phenoltriphenylphosphonium chloride (PTPPC), 4-anilinetriphenylphosphonium bromide (ATPPB), 4-benzyl alcoholtriphenylphosphonium chloride (BATPPC), 4-chlorophenyltriphenylphosphonium bromide (CPTPPB) and two commercially available phosphonium salts, tetraphenylphosphonium bromide (TPPB)

Abstract— Theoretical results of investigating the influence of the electric field on cylindrical jets of a liquid dielectric with fast charge relaxation to a weakly nonlinear approximation are presented. It is shown that on free interfaces local and periodically nonlinear deformations and nonlinear waves can be formed. The behavior of the free surfaces of the jets under the changing electric field

Abstract— The results of the experimental studies on the effect of hydrostatic pressure, charge voltage, stored discharge energy, and wire diameter on the amplitude of a pressure wave upon an electric wire explosion in water are presented. It is shown that the amplitude of the pressure wave generated in a liquid increases with an increase in the stored energy and charge voltage, and at an optimum diameter

Abstract— The characteristic features of the hydrothermal synthesis of molybdenum sulfide nanoparticles, using Na2MoO4 as the molybdenum precursor and thioacetamide as the sulfur precursor, at a synthesis temperature of 220°C, and of electrochemical synthesis—anodic formation of nanoparticles from MoS2 single crystals by electrolysis in an ionic liquid—are described. The X-ray fluorescence, optical

Abstract This work investigates the effect of a liquid medium on the roughness and the chemical composition of an ablated, stainless steel target, as well as on various properties of the laser-generated nanoparticles, such as absorption, hardness, and yield; in addition, some possible applications of laser ablation in both water and hexane are suggested. It is found that changing the liquid medium

Abstract An aqueous extract of Macaranga peltata leaves has been investigated as green corrosion inhibitor for mild steel in 1 M hydrochloric acid medium using gravimetric and electrochemical methods. The inhibition efficiency increased with an increase in the inhibitor concentration and temperature. The aqueous extract of Macaranga peltata leaves acts as mixed type of inhibitor. The adsorptions of

Abstract— Pyrolytic chromium carbide coatings (PCCs) deposited on stainless steel from the vapor phase using metalorganic chromium-containing liquid Barkhos and then annealed at 700−1000°C are investigated using X-ray diffraction and metallographic analysis; the elemental composition is also established. The annealing of PCC samples is carried out in air and in vacuum at different temperatures: 700

Abstract— This work presents the results of a study of the electrical-power characteristics of a thermophotovoltaic solar collector, the receiving surface of whose photocells was modified using a plasma-electrolytic coating made of silver nanoparticles dispersed by a pulse-spark method. An improvement was found to the functional properties (efficiency and power) of the modified photoelectric converter

Abstract To improve physical-chemical properties of thin-film membranes from nylon and nylon membranes with a surface layer of polystyrene (PS), nylon-PS, the processing of the latter was carried out with microwave radiation (microwave) at a frequency of 2450 MHz and a power of 300 W in air. As a result of exposure to microwave radiation, changes were found in the mass of the membranes depending on