Galvanic Cell Research Articles

Thermodynamic Properties of Sm3Cl7 Chloride in the Standard State at 298.15 K

The EMF in the 473–728 K range of temperatures is measured for solid-phase galvanic cells (‒) Sm|SmCl2||BaCl2||SmCl3|Sm3Cl7 (+), (–) Sm|SmCl2||BaCl2||Sm3Cl7|SmCl2 (+), (–) SmCl2|Sm3Cl7|| BaCl2||SmCl3|Sm3Cl7 (+), and (–) Mg|MgCl2||BaCl2||SmCl3|Sm3Cl7 (+). Experimental data are processed according to the second law of thermodynamics using literature values of thermodynamic characteristics of the components of the EMF-forming reaction: Sm, Mg, SmCl2, SmCl3, and MgCl2. Values of the standard Gibbs energy of formation, the standard enthalpy of formation, and the standard entropy of chloride Sm3Cl7 at a temperature of 298.15 K are obtained by averaging data on four galvanic cells.

Fast Degradation of Azo Dyes by In Situ Mg-Zn-Ca-Sr Metallic Glass Matrix Composite

Mg-based metallic glass (MG) has attracted extensive attention in the field of wastewater treatment due to its high decolorization rate in degrading azo dyes. However, the azo dye degradation rate of Mg-based MGs is strongly dependent on the particle size. Improving the intrinsic degradation efficiency using large particles is of great interest for future applications. In this work, in-situ metallic glass matrix composites (MGMCs) with high Mg content were successfully prepared by melt spinning. It is found that when the Mg content is 79-82%, the as-spun sample shows typical glassy characteristics. The SEM and XRD tests confirm that the as-spun sample is composed of α-Mg dendrite, multiple Mg-Zn intermetallic particles and an MG matrix. The degradation experiment using Direct Blue 6 and a 500 μm particle sample demonstrate that the Mg82Zn14Ca3Sr1 MGMC sample degrades azo dyes faster than typical Mg-Zn-Ca MG alloy. It can be attributed to the galvanic cell effect on the α-Mg/MG interface, which reduces the waste of active Mg atoms in the MG matrix according to the corrosion protection mechanism by the α-Mg anode sacrifice. This result provides a new perspective and insight into the design of azo dye degradation alloys and the understanding of degradation mechanisms.

Study on Fracture Failure Behavior of Super 13Cr Tubing Caused by Deposited Corrosion

Fracture failure of super 13Cr can occur in complex and harsh environments such as high temperature, high pressure, and corrosive gas wells, which damages the economic benefit of oil and gas development and also poses a great threat to wellbore integrity. Therefore, it is urgent to study the corrosion mechanism of super 13Cr tubing in oil and gas wells, and this study performed an on-site experimental analysis on failed super 13Cr tubing, employing the microarea electrochemical scanning Kelvin probe (SKP) method to investigate the causes of corrosion of super 13Cr material. In addition, the thermodynamics of the mechanism by which pits turn into cracks was examined in light of the experimental findings on the nucleation and development of pitting corrosion. The findings reveal scale and clear pits on the surface of the failed super 13Cr tubing and that CaCO3 as well as FeCO3 are the scale’s primary constituents. According to the SKP scan results, the super 13Cr tubing has a risk of pitting under wells, and the galvanic cell with microcorrosion is the primary cause of pitting corrosion, which also shows that the potential difference between the anode area and the cathode area of the super 13Cr material gradually increases with the increase in immersion time. Under the autocatalytic effect of the occlusive corrosion cell and the applied load, the corrosion pits and cracks of super 13Cr tubing propagate, eventually leading to tubing breaks and failure.

Characteristic of Ceremai Fruit Electrical Properties as Electrolyte Solution in Galvanic Cells

It has been conducted a research to analyze ceremai fruit (Phyllanthus acidus) as an electrolyte solution for galvanic cells. The materials used consisted of copper (Cu), zinc (Zn) electrodes and an electrolyte solution from ceremai fruit. Electrolyte solution with a concentration variation of 60 to 100% was obtained from pure ceremai fruit electrolyte solution mixed with aquades. In addition, the electrolyte solution is fermented in a period of 1 to 5 days. The variables measured were pH, voltage, electric current and electric power. Based on the data analysis, it was found that the value of the acidity level was proportional to the concentration where at 100% solution concentration the pH value was 4.8 and at 60% the pH value was 5.4. The greatest voltage is 1 volt that obtained when the solution is in the most acidic state or highest concentration. It is found that the greater the concentration of the solution, the smaller the pH value (the acidity level increases) the value of the voltage, current and power will increase. However, when the electrolyte solution is fermented, it appears that the pH value is inversely proportional to the voltage generated. The longer of fermentation time, the pH value will increase but the voltage value will decrease. When the electrolyte solution is fresh, the pH value is 4.8 with a voltage of 1 volt, but on the 5th day of fermentation the acidity level increases with pH value of 2.15 but the voltage decreases to 0.65 volts. This is caused by oxygen exposure at the time of measurement so that the oxygen in the solution will increase. An increase of oxygen will reduce the density of electrically charged ions so that the current will decreases and the voltage will also decrease.

Corrosion and tensile behavior of intercritically heat-treated and cathodically polarized prestressing steel wires

The effect of the intercritical heat treatments producing various martensite volume fractions on the corrosion and tensile behavior of the cathodically polarized prestressing steel wires has been investigated. Potentiodynamic polarization and constant extension rate technique (CERT) tests are conducted to clarify these effects and to determine the mode of failure of the prestressing steel wires since the presence of the martensite in the prestressing steel wire microstructure results in the failure and breakage during the corrosion and cold drawing. The electrochemical data measurements reveal that the intercritically heat-treated and cathodically polarized prestressing steel wires containing higher volume fractions of martensite exhibit the lowest corrosion potentials and current densities which indicate higher corrosion rates. A significant decrease in the tensile strength and ductility by the accelerated corrosion tests is observed in the intercritically heat-treated and cathodically polarized prestressing steel wire specimens containing higher martensite volume fractions. The fracture surfaces of the intercritically and cathodically prestressed steel wire specimens containing higher fractions of martensite of 68% exhibit a mixed mode of failure, i.e., quasi-cleavage and microvoid coalescence after potentiodynamic polarization. Moreover, the brittleness due to the residual stresses induced by the formation of martensite and the generation of the galvanic corrosion cell between the martensite and pearlite is noted to be increased with increasing the amount of martensite in the prestressed steel wire specimens.

On the Issue of Development Trends and the Technical Level of Backup Current Sources Based on Energy Condensed Systems

Studies of trends in the development and technical level of standby current sources (SCS), powered by heating the electrolyte to melting by heat released during the combustion of pyro heaters (PH), SCS, high-temperature galvanic cells (HTGC) which are made in the form of multilayer PH and generate current in combustion mode, as well as hybrid power sources (HPS).

Enhanced reductive degradation of chloramphenicol by sulfidated microscale zero-valent iron: Sulfur-induced mechanism, competitive kinetics, and new transformation pathway

Crystalline iron sulfide (FeSx, i.e., FeS or FeS2) minerals as sulfur sources were used to prepare the mechanochemically sulfidated microscale zero-valent iron ((FeSx+ZVI)bm). Metastable FeS and FeS2 precursors were generated via aqueous coprecipitation and applied to fabricate FeSx@ZVI samples. (FeSx+ZVI)bm and FeSx@ZVI exhibited better chloramphenicol (CAP) degradation than ZVI due to the increase in specific surface areas, the decrease of electrochemical impedance, the formation of galvanic cells, and sulfur-induced pitting and local acidity. (FeSx+ZVI)bm had better CAP removal capacity than FeSx@ZVI under different S/Fe molar ratios, initial pH, and oxygen conditions. At the same time, FeSx@ZVI showed better electron utilization under oxic conditions, related to their Fe0 and sulfur spatial distribution. Nitro reduction and dechlorination of CAP by (FeSx+ZVI)bm produced nitroso, azoxy, amine, and monodechlorination products, while dechlorination was not involved in the degradation process of CAP by FeSx@ZVI. A new transformation pathway of nitroso-CAP to amine-CAP mediated by azoxy products is proposed via coupling a chain decay multispecies model and DFT calculations. The larger competitive reaction rates among O2, CAP, and its degradation products was determined by their lower LUMO energy. The contribution of direct electron transfer to nitro reduction was greater than that of atomic hydrogen, but the opposite was true for dechlorination. FeSx@ZVI had a larger DET contribution than (FeSx+ZVI)bm, and FeS2 promoted the DET contribution better than FeS. Toxicity assessment indicated that the rapid transformation of nitroso and azoxy products was crucial for eliminating the biotoxicity of CAP.

Composite-fabric-based structure-integrated energy storage system

A structure-battery-integrated energy storage system based on carbon and glass fabrics is introduced in this study. The carbon fabric current collector and glass fabric separator extend from the electrode area to the surrounding structure. This system provides stable and high electrochemical performance under the mechanical loading of the composite structural battery. A thermoplastic tape melted into the fabrics separates the battery and structural parts to prevent penetration of epoxy into the battery part during autoclave molding and leakage of liquid electrolyte. Furthermore, a stainless-steel film blocks moisture penetration in the direction of the thickness. The electrochemical characteristics and mechanical stability of the structural battery were evaluated using a galvanic cell tester. The initial capacity of the structural battery was approximately 125 mAh/gLFP, and it exhibited steady cycling characteristics with a capacity of 110 mAh/gLFP for up to 50 charging/discharging cycles. The structure-integrated battery exhibited an energy density of over 25 Wh/kgstr, stable electrochemical performance, and load-bearing characteristics even when some of the battery components were subjected to tensile strain beyond the 1% level.

An overview of hydrogen generation by hydrolysis of Al and its alloys with the addition of carbon-based materials

Al and its alloys are studied extensively for hydrogen generation through water splitting. Alloying Al with metal activators such as bismuth, indium, gallium, etc., leads to the formation of micro galvanic cells during hydrolysis reaction, resulting in an improved hydrogen generation rate. Activation of Al by adding carbon-based materials such as graphite, carbon nanotubes (CNTs), graphene, etc., can instantaneously generate hydrogen at room temperature. When carbon particles are desorbed from the Al matrix during hydrolysis, new Al is exposed, resulting in an increased reaction rate. In Al-Graphite composites which form core-shell structures, H2O molecules penetrate through the graphite layers and break down the core-shell structure during hydrolysis, and the new Al surfaces are exposed to water. It was found that Al with nano bismuth and graphene nanosheets showed better hydrogen generation rate and hydrogen yield. Graphene nanosheets control the agglomeration of Al and enhance the specific surface area for hydrolysis. During the hydrolysis of Al-CNTs composites, CNTs act as a cathode, resulting in galvanic corrosion between CNTs and the Al matrix. CNTs can also effectively control the agglomeration of Al during ball milling. Spark plasma sintered Al–Bi-CNT composites showed an enhanced hydrogen generation rate during hydrolysis. This paper presents an overview of hydrogen generation by hydrolysis of Al and its alloys, emphasising the addition of carbon-based materials such as graphite, graphene, CNTs, etc.

Schottky construction of bimetallic Au-Cu alloy@TiO2 hollow nanoboxes embedded optical switch for enhancing photocatalytic and selective adsorption activities via one-pot deposition-precipitation strategy

One-pot soft integration strategy based on wet chemistry via a simple in situ deposition-precipitation approach has been developed to fabricate series of bimetallic Au-Cu alloy@TiO2 hollow nanoboxes (THB) embedded optical switch. The bimetallic Au-Cu alloys were embedded into the nanodevice through Schottky junctions. This embedded optical switch could exhibit excellent photocatalytic performance. Under simulated sunlight irradiation, Au-Cu4:3 @THB nanodevice exhibited the photodegradation rate of RhB was of 99.4 % in 150 min, which was 3.0 times higher than that of THB. The oxidation rate of NO reached 27.0 %, 2.3 times that of THB. The enhanced photocatalytic activity could mainly be attributed to Au-Cu alloy SPR effects; the photoreactivity of the nanodevice was greatly improved after modification with bimetallic Au-Cu. Under dark conditions, the RhB adsorption rate of bimetallic Au-Cu4:3 @THB nanodevice reached 98.6 %, which was 6.1 times higher than that of THB. As the adsorption effect test of mixed dyes (MB/MO and RhB/MO), after 5 h of adsorption, the adsorption capacity of cationic dyes was 3.1 times that of anionic dyes, it was concluded that the bimetallic Au-Cu4:3 @THB optical switch had an excellent selective adsorption effect. This was due to the large surface area and mesoporous structure of the adsorbent, good electron transport structure, and the formation of a galvanic cell after adding dyes. This research provides a promising catalytic material with optical switch for environmental restoration and protection. It has broad application prospects in photocatalytic degradation, photocatalytic oxidation and adsorption of organic pollutants.

Graphene coated copper in a one-year atmospheric corrosion and color preserving challenge

A one-year atmospheric corrosion study was conducted to evaluate the performance of transparent single-layer (SLG) and multilayer graphene (MLG) coating as a protective coating on copper substrate against atmospheric corrosion and color changing. Employing the CIE−L*a*b* color space, it was shown that the transparent SLG and MLG coatings can maintain the pure color of copper before exposure to the atmosphere. However, after 15 days the color change (∆E) in the SLG-coated copper (SLG/Cu) was found to be more than that in the bare copper. A scanning Kelvin probe (SKP) was used to measure the surface potential as well as corrosion behavior. The observed decrease of average surface Volta potential of SLG/Cu, from -312 mV to -830 mV, was supposed to be caused by corrosion and electron transfer during galvanic cell formation. Further examinations by Raman spectroscopy, OM, and AFM measurements were logically correlated with those from SKP. Moreover, it was revealed that the surface voltaic potential for MLG-coated copper (MLG/Cu) remains constant along one-year atmospheric exposure. The presented results strongly prove that the MLG coating could be considered an anti-corrosion coating that can fully preserve the color of copper metal after exposure to the environment for at least a year.

Electrochemical Performance of Galvanic Cell with Silver Coated Cathode in One Compartment System Using Seawater as Electrolyte

This research was carried out to evaluate the electrochemical performance of a galvanic cell using seawater as an electrolyte. The cell was designed to have a volume of 200 mL and equipped with Zn as an anode and Ag-coated Cu as a cathode (Cu(Ag)-Zn system) in order to suppress the corrosion of Cu. As a comparison, the same experiment with the use of uncoated Cu as a cathode (Cu-Zn system) was also conducted. To conduct the experiment, a system was assembled by connecting 20 cells in series and placed in a closed container filled with seawater. The experiment was run for 72 hours, divided into three 24-hour cycles, by replacing the seawater every 24 hours. The performance of the system was evaluated in terms of open circuit voltage, close circuit voltage, current, light intensity, internal resistance, and power. The experimental results show that the corrosion rate of Cu coated with silver was smaller than that of uncoated Cu. Compared to the performance of the Cu-Zn system, it was also found that the Cu(Ag)-Zn system produced higher power and light intensity, which is in accordance with its smaller internal resistance. The overall experimental results indicate better performance of Cu(Ag)-Zn system and this better performance is attributed to the significantly lower corrosion rate of Cu(Ag) cathode which signifies the role of Ag layer to protect the Cu from attack by seawater. As a result, the Cu(Ag)-Zn system maintained the cathode corrosion rate with a ratio of 0.19. The percentage decrease of the OCV of the Cu(Ag)-Zn system was 6.14%, the CCV on the third day was 0.99%, the current was 36.68%, and the power was 37.83%.

Study on electrochemical reduction mechanisms of iron oxides in pipe scale in drinking water distribution system

Iron release from pipe scale is an important reason for water quality deterioration in drinking water distribution systems (DWDS) globally. Disruption of pipe scale, release and transformation of iron compounds are hot topics in the field of water supply. The aim of this study is to determine whether and how ferric components in pipe scale be reduced under anoxic condition. In this study, new investigation approaches were applied, which include simplifying the complex scale into electrode pairs, developing novel simulating reactors and conducting tailored electrochemical assays. A galvanic cell reactor with anode of metallic iron (Fe0) and various cathode made of certain iron oxide (FeOx) was firstly developed to simulate the complex niche and components of pipe scale. Electrochemical methods were used to study the reduction characteristics of scale. The results proved that reduction of iron oxide scale did occur under anoxic condition. Electromotive forces between various electrodes match the Nernst Equation quite well. As main components in pipe scale, lepidocrocite (γ-FeOOH) was found to be the most reducible iron oxide but at low rate, while goethite (α-FeOOH) has weak reducibility but can be quickly reduced. As a result of electrochemical reactions, goethite in pipe scale was transformed into magnetite (Fe3O4). By these means, electrochemical reaction mechanisms of pipe scale disruption were revealed, which is helpful to restrain pipe corrosion and water deterioration in DWDS.

Electrochemical Sensors for Controlling Oxygen Content and Corrosion Processes in Lead-Bismuth Eutectic Coolant-State of the Art.

Controlling oxygen content in the primary circuit of nuclear reactors is one of the key tasks needed to ensure the safe operation of nuclear power plants where lead-bismuth eutectic alloy (LBE) is used as a coolant. If the oxygen concentration is low, active corrosion of structural materials takes place; upon increase in oxygen content, slag accumulates due to the formation of lead oxide. The generally accepted method of measuring the oxygen content in LBE is currently potentiometry. The sensors for measuring oxygen activity (electrochemical oxygen sensors) are galvanic cells with two electrodes (lead-bismuth coolant serves as working electrode) separated by a solid electrolyte. Control of corrosion and slag accumulation processes in circuits exploring LBE as a coolant is also based on data obtained by electrochemical oxygen sensors. The disadvantages of this approach are the low efficiency and low sensitivity of control. The alternative, Impedance Spectroscopy (EIS) Sensors, are proposed for Real-Time Corrosion Monitoring in LBE system. Currently their applicability in static LBE at temperatures up to 600 °C is shown.

Визначення ступеня небезпеки відходів гальванічних елементів (батарей)

Abstract. In recent decades, the world has faced a new environmental problem ‒ waste electrical and electronic equipment (WEEE). Timely prevention of the formation of WEEE, minimization of their volume, reuse, recycling and recovery of resources ‒ all these issues require urgent appropriate solutions. Aim. Determining the degree of hazard of waste galvanic elements (batteries) and assigning this waste to the category of hazardous or safe according to national norms and rules. Materials and Methods. Waste galvanic cells (batteries) were the object of research. The samples were dissolved in concentrated nitric acid. The solutions were diluted with distilled water, filtered, and then the content of heavy metals was determined according to DSTU ISO 11885:2005 "Water quality. 33 elements were determined by the method of atomic emission spectrometry with inductively coupled plasma" (ISO 11885:1996, IDT) and GOST 30178-96 "Raw materials and food products. Atomic absorption method for determination of toxic elements". Determination of elements was carried out on an optical emission spectrometer with an inductively coupled plasma "SHIMADZU ICPE-9820". Research results. It was established that the content of lead, cadmium, mercury in waste galvanic elements (batteries) does not exceed the established hygienic standards for the soil ("Hygienic regulations of the permissible content of chemical substances in the soil", Order of the Ministry of Health of Ukraine No. 1595 dated 14.07.2020). Mercury: in 25 samples it was detected at a level that is lower than the sensitivity of the method, in two samples it is 2.25 times and 4.2 times less than the Limit Permissible Concentrations (LPC); in four ‒ 27-48.8 times less, in three ‒ 58-91 times less. The LPC of mercury in soil is 2.1 mg/kg. Cadmium: in 1 sample it was detected at a level that is lower than the sensitivity of the method, in 26 samples it is 2-7.5 times less than the LPC; in the 7th ‒ 9-30 times less. The LPC of cadmium in soil is 1.5 mg/kg. Lead: in 13 samples it was detected at a level that is lower than the sensitivity of the method, in 2 samples it was 3 times less than the LPC, in 6 samples it was 12-19.4 times less than the LPC, in 13 samples ‒ in 24-31 times less than LPC. Maximum permissible limit for lead in soil is 32 mg/kg. It was established that the examined waste samples of galvanic elements (batteries) can be classified as safe and processed and disposed of at the appropriate enterprise. Conclusions. The negative effect of WEEE components on the environment and, as a result, on human health is associated with the inevitable risk of their entering environmental objects due to improper handling of waste galvanic elements (batteries). In order to prevent and minimize the risk to the environment and the population, it is necessary to introduce selective sorting of WEEE components at the places of their generation or collection and sending them for processing, as well as to develop sanitary and epidemiological requirements for sorting processes and to carry out an examination of projects and installations for the utilization of such types of waste for compliance these requirements. Key Words: waste electrical and electronic equipment, waste batteries and accumulators, hazard assessment.

A pre-Columbian galvanic technique able to explain the gilding of copper in northern Peru

Around 150 BCE and 700 CE, pre-Columbian goldsmiths in the Peruvian northern coastline developed a method for gilding copper. The characteristics of the resulting pieces are substantially different from those obtained by hammering, embossing, and casting. We discuss two electrochemical gilding methods that were possibly developed by pre-Columbian goldsmiths. The first method consists of electrochemical replacement where copper is immersed in a solution containing dissolved gold. The second method utilizes the same solution but includes pyrite to form a galvanic cell with copper as the cathode and pyrite as the anode. Characterizations via X-ray fluorescence (XRF) and Scanning electron microscopy with energy dispersion spectroscopy (SEM-EDX) allowed a comparison of the results of the two methods with archaeological samples. The electrochemical replacement method does not reach thicknesses observed in archeological samples and delivers irregular gilding due to the formation of anodic spots on copper. Meanwhile, including pyrite as an anode in the electrochemical cell leads to a more homogeneous deposition of gold with layer thicknesses similar to those found in archaeological samples. This work contributes to understanding pre-Columbian techniques lost before the Inca Empire.

Electrochemical purification of Disperse Red 167 azo dye-based synthetic waste-water through the electrooxidation and electrocoagulation with Fe ions derived from Cu/Fe macro-corrosion galvanic cell

Electrochemical purification of Disperse Red 167 azo dye-based synthetic waste-water through the electrooxidation and electrocoagulation with Fe ions derived from Cu/Fe macro-corrosion galvanic cell

Analysis of Solubility Change of Soluble Magnesium Alloy by Melting Treatment in Petroleum Downhole

In order to solve the problem that the material utilization rate of soluble magnesium base alloy rod is less than 30%, the method of magnesium alloy rod casting is adopted to improve the material utilization rate. However, the cooling mode affects the dissolution rate of soluble magnesium alloy after casting. According to the different thermal conductivity of different materials, cylindrical graphite molds and copper molds with diameters of 5mm and 40mm are selected for casting magnesium alloys. In order to ensure the reliability of experimental results, polarization method and weight loss method were used to analyze the dissolution rate of soluble magnesium base alloy under different cooling modes. The test results show that: Magnesium alloy is cooled and solidified by copper mold with a diameter of 5mm, and the dissolution rate is the highest in 1.5% NaCl solution with a speed of 1.2856mm/h. The grain size of magnesium alloy can be refined by increasing cooling rate. After the grain boundary of magnesium-based alloy is refined, the grain boundary between the alloy increases, the number of corrosion galvanic cells increases, and the dissolution rate of magnesium-based alloy gradually increases.

Fabrication of a P-Si/ZnO heterojunction based on galvanic cell driven and the complete degradation of RhB via fast charge transfer.

Semiconductor heterojunctions can significantly enhance photocatalytic degradation efficiency by facilitating rapid interfacial charge transfer. This article is based on the galvanic-cell driven principle; porous silicon (P-Si) was prepared by the carbon-catalytic etching method, and ZnO was loaded on its surface via electroless chemical deposition technology to form a P-Si/ZnO heterojunction, which was applied to the degradation of Rhodamine B (RhB). At a deposition temperature of 90 °C, a flawless 1D hexagonal prism structure of ZnO was formed, allowing the P-Si/ZnO heterojunction to completely degrade RhB within 2 hours with a degradation rate of 100%. Compared with a single P-Si material, the degradation performance is improved by 1.7 times. The formation of the built-in electric field and the rapid charge transfer at the heterojunction interface realized the complete degradation of RhB organic pollutants. After 20 cycles of use, the photocatalytic degradation rate remains above 70%, demonstrating excellent stability and recyclability.

Моделирование электрических параметров гальванической ячейки в процессе микродугового оксидирования

Microarc oxidation is a promising technology for producing wear-resistant anticorrosive coatings for goods made of valve metals and alloys and is used in many industries. One of the main problems of this technology is low controllability caused by the complexity and interconnectedness of physical and chemical phenomena occurring during the coating process. To solve such problems, digital twins are currently actively used. The paper covers the development of mathematical models that are advisable to use as structural elements of the digital twin of the microarc oxidation process. An equivalent electrical circuit of a galvanic cell of microarc oxidation is given, which takes into account the electrolyte resistance, the part coating resistance in the form of a parallel connection of nonlinear active resistance and capacitive reactance. The authors propose a mathematical model describing the behavior of the equivalent electrical circuit of a galvanic cell of microarc oxidation. A technique for determining the parameters of this model was developed, including the construction of a waveform of changes in the resistance of the cell and its approximation, estimation of the values of resistances and capacitance of the galvanic cell equivalent circuit. The authors proposed a calculation method and developed a Simulink model of the microarc oxidation process, which allows simulating the current and voltage waveforms of a galvanic cell. The analysis of the model showed that the model is stable, controllable and observable, but poorly conditioned, which leads to modelling errors, the maximum value of which is 7 % for voltage and 10 % for current. By the parametric identification method using experimental current and voltage waveforms, the dependences of the parameters of the galvanic cell equivalent circuit on the oxidation time are obtained. It is found that the change in the period average of the galvanic cell active resistance correlates with the coating thickness.