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Journal articles on the topic 'Microarc oxidation'

Author: Grafiati

Published: 30 May 2022

Last updated: 19 July 2025

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Ma, Jie, Yuan Sheng Yang, Xiu Chun Wang, Jing Zhang, Shuo Liu, and Xi Bin Yi. "Effect of Impulse Voltage on Microstructure and Corrosion Resistance of Microarc Oxidation Coatings on AZ80 Magnesium Alloy." Key Engineering Materials 575-576 (September 2013): 418–22. http://dx.doi.org/10.4028/www.scientific.net/kem.575-576.418.

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Microarc oxidation coating and microarc oxidation-fluorocarbon coating were prepared on the surface of AZ80 magnesium alloy profiles. The phase structure, surface morphology and corrosion resistance of the coatings were investigated using SEM, XRD, copper sulfate spot test and polarization curve test. The main phase compositions of the microarc oxidation coatings were MgO, Mg2SiO4, MgSiO3, MgF2 and MgAl2O4. With increasing pulse voltage, the oxidation coating became thicker and the microstructure of the coating surface became compact; therefore the coating corrosion resistance was improved. The oxidation coating with pulse voltage of microarc oxidation controlled between 300-438V obtained the best corrosion resistance. The corrosion current density of magnesium alloy reduced 1-3 orders of magnitude after microarc oxidation treatment with increasing pulse voltage, and the corrosion resistance of microarc oxidation-fluorocarbon coating is desirable.

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Shtefan, Viktoriia, Hkouka Mabila Belandre Dieuveille, Nadiia Kanunnikova, and Serhii Leshchenko. "INFLUENCE OF CURRENT DENSITY ON THE PROCESS OF FORMATION OF OXIDE COATING ON ZIRCONIUM ALLOY E110." Bulletin of the National Technical University «KhPI» Series: New solutions in modern technologies, no. 1(11) (May 18, 2022): 69–74. http://dx.doi.org/10.20998/2413-4295.2022.01.11.

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Today, binary, triple and quadruple zirconium alloys containing iron, chromium and copper are known for corrosion protection, which have a clear advantage over circal and niobium binary alloys in terms of corrosion resistance. However, insufficient attention is paid to studies aimed at studying the process of formation and morphology of oxide films on the zirconium alloy E110. This area of research has a high scientific and technical interest in the development of oxide coatings on metal surfaces, given the widespread use of zirconium alloys in nuclear energy as a structural material in the construction of nuclear reactors. The paper considers the advantages of the method of microarc oxidation in comparison with other methods of protection of zirconium alloys from different types of corrosion damage. The main task of the work is to study the influence of current density on the formation and morphology of oxide films on zirconium alloy. It was found that the obtained dependences of the formation stress on the time of microarc oxidation of zirconium alloy in 1 mol/l potassium pyrophosphate at different current densities have a characteristic classical appearance, characterized by three sections, such as spark, spark and microarc. The dependence of the rate of change of the voltage dU / dt on the molding voltage is constructed for a more detailed study of the process of formation of oxide films and determination of the moment of the beginning of sparking and microarcs. It was found that when the current density increases to 6 A/m2, the spark voltage increases by 5 V, and when it increases to 10 A/m2 - by 15 V, but the voltage of the microarcs remains unchanged. Mostly solid, well-bonded to the base oxide films of light gray colour on a zirconium alloy are obtained. The morphology of oxide coatings obtained on the surface of the zirconium alloy E110 by the method of microarc oxidation in potassium pyrophosphate at different current densities was studied. It is shown that oxide films without cracks and surfaces have irregularities with a cellular texture.

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Ma, Jie, Yuan Sheng Yang, Xiu Chun Wang, et al. "Microstructure and Corrosion Resistance of Microarc Oxidation Coatings on AZ31 Magnesium Alloy Extrusion Profiles." Advanced Materials Research 557-559 (July 2012): 1993–97. http://dx.doi.org/10.4028/www.scientific.net/amr.557-559.1993.

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Microarc oxidation coatings were prepared on the surface of AZ31 magnesium alloy profiles. Oxidation time of the coatings was between 5min-10min. The phase structure, surface morphology and corrosion resistance of the coatings were investigated using SEM, XRD, copper sulfate spot test and polarization curve test. The results indicate: the main phase compositions of the microarc oxidation coatings are MgO, Mg2SiO4 and MgSiO3; with increasing pulse voltage, the micropore diameter of the coating surface becomes larger, the micropore number reduces and the coating surface roughness increases; the corrosion current density of magnesium alloy reduces significantly after microarc oxidation treatment. The pulse voltage of microarc oxidation should be controlled between 240V-360V to obtain the best corrosion resistance.

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Peng, Guang Huai, Bao Jun Han, Ling Fang, Xue Feng Guo, and Xiao Lian Zhang. "Effect of Negative Pulse Voltage on the Microstructure and Corrosion Resistance of Microarc Oxidation Film of A356 Aluminum Alloy." Materials Science Forum 675-677 (February 2011): 1193–96. http://dx.doi.org/10.4028/www.scientific.net/msf.675-677.1193.

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The effect of negative pulse voltage on the microstructure and corrosion resistance of microarc oxidation film of A356 aluminum alloy treated by microarc technique was investigated by SEM, coating thickness gauge and electrochemical workstation etc. The results show the negative pulse voltage greatly influences the microstructure and corrosion resistance of microarc oxidation film by its electrode reaction. The film thickness increases while the size of pore and roughness of the film surface decreases initially and then increases with negative pulse voltage increasing. The microarc oxidation treatment considerably improved corrosion resistance, and the highest corrosion potential was -1.16V, which was 0.38V higher than that of substrate, and the corrosion current was lower than that of substrate about three orders of magnitude.

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Zhassulan, A. Zh, Zh B. Sagdoldina, E. M. Mukhametov, K. D. Ormanbekov, and A. B. Shynarbek. "Calcium-phosphate coatings obtained by microarc oxidation (review)." Bulletin of Shakarim University. Technical Sciences, no. 2(10) (June 30, 2023): 12–22. http://dx.doi.org/10.53360/2788-7995-2023-2(10)-2.

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This literature review examines the topic of microarc oxidation of calcium phosphate coatings, which has received considerable attention in recent years due to its potential application in biomedical and engineering fields. The advantages of the microarc oxidation method for obtaining protective coatings are described. The main attention is paid to the formation of coatings under various modes of the microarc oxidation process and with the help of electrolytes containing suspended powders of various elements and concentrations. The review examines various aspects of the technology, including the underlying principles, the types of coatings that can be obtained, and the methods used to determine the characteristics. In addition, the review examines the potential applications of microarc oxidation in calcium phosphate coatings in various fields, such as biomedical implants, aerospace components and tissue engineering. It discusses the advantages of coatings, such as improved osseointegration, corrosion resistance and wear protection, as well as the potential for the inclusion of bioactive molecules in coatings to further improve their performance. Overall, the review concluded that calcium phosphate coatings have great potential for various applications, but further research is needed to fully understand the potential of this innovative technology and optimize its performance for specific applications.

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Akhmedova, Z. R., A. I. Komarov, T. E. Shonakhunov, et al. "Structure and Properties of Solid Aluminum Oxide Nanocomposites – a Promising Sorbent for Immobilization of Biometabolites and Microorganisms." Ecology and Industry of Russia 29, no. 5 (2025): 19–25. https://doi.org/10.18412/1816-0395-2025-5-19-25.

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The data on investigation of oxide-ceramic coating formed by microarc oxidation of porous samples from aluminum alloys of different chemical composition (AK15, AMg6, D16) are presented. The microstructure of the obtained composites, pore size distribution, macrostructure of the surface of porous aluminum samples before and after microarc oxidation, phase and elemental composition were studied. It is shown that microarc oxidation leads to the formation of a composite coating consisting of various forms of aluminum oxide (α-, γ-Al2O3) and mullite 3Al2O3·2SiO2. It is noted that the obtained oxide compounds of aluminum and silicon can serve as the basis of sorbents for immobilization of chemical and biological substances with different molecular weights, as well as cells of microorganisms, in particular Escherichia coli.

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Rakoch, A. G., and I. V. Bardin. "Microarc oxidation of light alloys." Metallurgist 54, no. 5-6 (2010): 378–83. http://dx.doi.org/10.1007/s11015-010-9309-y.

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Pecherskaya, E. A., A. D. Semenov, and P. E. Golubkov. "Simulation of electrical parameters of a galvanic cell in the process of microarc oxidation." Frontier materials & technologies, no. 4 (2023): 73–85. http://dx.doi.org/10.18323/2782-4039-2023-4-66-7.

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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.

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Malyshev, V. N., A. M. Volkhin, and B. M. Gantimirov. "Tribological Characteristics Improvement of Wear Resistant MAO-Coatings." Journal of Coatings 2013 (June 19, 2013): 1–5. http://dx.doi.org/10.1155/2013/262310.

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Currently, the most promising technology of coating formation is microarc oxidation (MAO) with unique properties of the surface layer, which combine high wear resistance, corrosion resistance, and heat and erosion resistance. Microarc oxidation can be used for parts and components manufacturing in various segments of industries. However, the technology improvement by improving the tribological characteristics of MAO-coatings can not only enhance economic effect, but also expand its application.

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Kuleshkov, Yuriy, Mykhailo Krasota, Timofey Rudenko, Ruslan Osin, and V. Kroshka. "Strengthening of Aluminum Alloy Parts by Micro-Arc Oxidation." Central Ukrainian Scientific Bulletin. Technical Sciences, no. 4(35) (2021): 44–53. http://dx.doi.org/10.32515/2664-262x.2021.4(35).44-53.

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The purpose of the research is to analyze the scientific and technical information to determine the possibility of strengthening the parts of aluminum alloys by microarc oxidation, in particular gear pump housings. The article presents the results of the analysis of possibility of using a new method of hardening roboczych surfaces - micro-arc oxidation to enhance the wear resistance of working surfaces of parts made of aluminum alloys, in particular housings, gear pumps NSH. The paper describes the essence of the process of hardening parts by microarc oxidation, presents the main physical and mechanical characteristics of the hardening coating. It is noted that the adhesion strength and mechanical properties of the coating largely depend on the state of the surface to be strengthened, in particular, on the method of pretreatment. At the same time, it was found that the strengthening coating of the metal after plastic deformation has a greater adhesion strength, greater thickness and hardness. The paper presents the basic information about microarc oxidation, which, according to the authors, will contribute to the development of the method in the poorly studied method of hardening in repair production. It can be concluded that the ceramic coatings obtained by microarc oxidation can be recommended for the restoration and strengthening of aluminum parts of gear pumps, in particular the pump housing.

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WANG, Y. M., B. L. JIANG, L. X. GUO, and T. Q. LEI. "ANTIFRICTION PROPERTY OF MICROARC OXIDATION COATING ON TITANIUM ALLOY UNDER SOLID LUBRICATING SLIDING CONDITION." Surface Review and Letters 11, no. 04n05 (2004): 367–72. http://dx.doi.org/10.1142/s0218625x04006360.

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Ceramic coatings were fabricated on Ti6Al4V alloy surface by microarc oxidation (MAO) in Na 2 SiO 3–( NaPO 3)6– NaAlO 2 solution using an AC power supply. Microstructure and phase composition of coating were characterized by SEM and XRD, respectively. The antifriction property of the coating with and without solid lubricant sliding against SAE 52100 steel ball was investigated on a pin-on-disk friction and wear tester. The results show that the microarc oxidation coating is relatively dense and uniform, mainly composed of rutile and anatase. The coating sliding against the steel has friction coefficient as low as 0.2–0.3 at an applied load of 0.5 N and sliding cycle below 2500, which is much smaller than that of uncoated Ti6Al4V against the same counterpart. The transferring of materials from the softer steel ball onto the coating surface is the main wear event, while the microarc oxidation coating is characterized by slight abrasive wear and adhesive wear. Introducing solid graphite lubricant into the porous surface of microarc oxidation coating significantly improves the long-term antifriction property (registering friction efficient of 0.15 in the long-term sliding) under a similar sliding condition. This improvement is attributed to the reduction of materials that are transferred from the softer steel ball onto the coating surface.

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Khokhlov, A., D. Maryin, D. Molochnikov, A. Khokhlov, I. Gayaziev, and O. Smirnova. "Influence of the thickness and porosity of the oxide coating on the piston heads depending on the parameters of the microarc oxidation mode." Journal of Physics: Conference Series 2131, no. 4 (2021): 042046. http://dx.doi.org/10.1088/1742-6596/2131/4/042046.

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Abstract This paper discusses the process of formation of an oxide coating (hardening and heat-insulating coating) on the working surfaces of the head (top and piston grooves) of the piston by the method of microarc oxidation (MAO). In the process of oxidation of the piston head, the operating parameters of MAO will have a significant effect on the thickness and porosity of a formed oxide coating. The paper presents the theoretical relationships between the electrical parameters of the microarc oxidation mode and the thickness and porosity of the oxide coating. The thickness of the formed oxide coating on the piston heads will depend on the applied voltage and the composition of the electrolyte used. The porosity of the formed oxide coating will depend on the parameters of the current strength and the applied voltage. It is theoretically established that the formation of an oxide coating of a certain thickness and porosity occurs due to changes in the current strength, voltage and time of microarc oxidation.

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Liu, Wan Hui, Ai Lian Bao, Xin Yu Mao, and Guang Hai Zheng. "Microstructure and Properties of Microarc Oxidation Ceramic Coatings on Aluminum Alloy." Key Engineering Materials 353-358 (September 2007): 1895–98. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.1895.

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The paper discusses structure and property aspects of oxide films formed on 7075 aluminum alloys by microarc oxidation in alkali-silicate electrolytic solution. Microstructure, surface morphology and phase composition of the ceramic coatings were investigated by SEM and XRD. Distribution of hardness along the coating thickness was determined by microhardness analyses. The friction and wear behavior of the oxide films against steel counterparts was evaluated with a friction and wear tester. The results showed that the microarc oxidation coatings composed mainly of α-Al2O3 and γ-Al2O3 phase are dense and uniform, which indicates that the wear resistance of Al alloy could be improved obviously by microarc oxidation. The films possess a beneficial combination of 25~45 μm thickness, HV0.11500 microhardness and provide a low wear rate but a relatively high friction coefficient against GCr15 steel under dry friction condition.

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TANG, MING QI, WEI PING LI, HUI CONG LIU, and LI QUN ZHU. "THE EFFECT OF TITANIA SOL IN PHOSPHATE ELECTROLYTE ON MICROARC OXIDATION COATINGS ON ALUMINUM ALLOY." International Journal of Modern Physics B 24, no. 15n16 (2010): 3190–95. http://dx.doi.org/10.1142/s0217979210066306.

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Black and gray microarc oxidation coatings have been obtained on 2A70 Aluminum alloy in phosphate electrolyte with and without titania sol, respectively. The growth process of the microarc oxidation coating in the electrolyte with titania sol was investigated. The coating was characterized by scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and X-ray. The coating thickness was measured by eddy current thickness meter. The results show that the titania sol increase the growth rate of microarc oxidation coating. In both cases the composition of coatings contain Al and O , and are mainly composed of γ- Al 2 O 3 and AlPO 4. Compared with the gray coating, large amount of Ti is found on the surface of black coating. The titania sol added in the electrolyte results in Ti in the coating, in the form of TiO and Al 2 TiO 5.

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Lu, Chuang, Fa Qin Xie, and Li Ping Zhu. "Microstructure and Tribological Properties of Microarc Oxidation Coatings on Al-Si Alloy." Key Engineering Materials 703 (August 2016): 112–18. http://dx.doi.org/10.4028/www.scientific.net/kem.703.112.

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Microarc oxidation(MAO) was used to prepare the coatings on the surface of Al-Si alloy. Besides, scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD) were utilized to research the microstructure characteristics, the components distribution, and the phase compositions, for the microarc oxidation coatings on Al-Si alloys. Furthermore, the growth process and wear properties of the coatings were explored. Results indicated that:the phase compositions of microarc oxidized coating consisted of mullite (3Al2O3·2SiO2), α- Al2O3 and γ- Al2O3. With the increase of load, the friction coefficient of the coating decreased, however it was greater than that of Al-Si alloy substrate. The wear resistance of the coating were one time higher than that of the substrate.

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Chen, Fei, Hai Zhou, and Fan Xiu Lv. "Friction and Wear Behavior of Micro-Arc Oxidation Ceramic Coating on Pure Magnesium Surfaces." Advanced Materials Research 228-229 (April 2011): 661–65. http://dx.doi.org/10.4028/www.scientific.net/amr.228-229.661.

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A relatively new process called microarc oxidation (MAO), also called plasma electrolytic oxidation (PEO), has emerged as a unique technique to produce hard, thick ceramic oxide coatings on different Mg or Al alloys. The magnesium offers various possibilities of application in industry, but its poor property in corrosion resistance, wear resistance, hardness and so on, limited its application. Through microarc oxidation, ceramic coating is directly formed on the surface of pure magnesium, by which its surface property is greatly improved. In this paper, a dense ceramic oxide ceramic coating was prepared on the magnesium by microarc oxidation in a Na2SiO3-Na2WO4-KOH-Na2EDTA electrolytic solution. The surface morphology of the coating was observed by the Scanning Electron Microscope (SEM). Using the X-ray diffraction (XRD), the phase structure of the coating was analyzed. The friction and wear behavior of the micro-arc oxidation ceramic coating under dry sliding against GCr15 steel was evaluated on a ball-on-disc test rig. The results showed that the magnesium was characterized by adhesion wear and scuffing under dry sliding against the steel, while the surface micro-arc oxidation ceramic coating experienced much abated adhesion wear and scuffing under the same testing condition. The micro-arc oxidation ceramic coating showed good friction-reducing and fair antiwear ability in dry sliding against the steel.

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Novikova, Olga, Aleksander Bolotov, and Vladislav Novikov. "Application features of microarc oxidation technology." E3S Web of Conferences 389 (2023): 01081. http://dx.doi.org/10.1051/e3sconf/202338901081.

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The technology of microarc oxidation of valve metals is one of the promising methods for engineering the working surface of friction units of modern technology. As a result of the versatility of the technology, it is possible to obtain composite ceramic coatings and materials of various types. Their properties are set by the electrical modes of material formation, the chemical composition of the electrolyte, and the possible further modification of the ceramic matrix with micro- and nanosized tribofillers. Based on the practical results of their research in the field of creating coatings of various types by microarc oxidation, an analysis is given of the main areas of application of microplasma electrolytic oxidation technology, their advantages over other methods of surface modification, structure and properties of the materials obtained. It is possible to distinguish the modification of the friction surface of a part by the method of microplasma electrolytic oxidation in order to increase its hardness and wear resistance. Good results were obtained in increasing the wear resistance of the hardened working surface of the spinning machine parts, the number of equipment repairs was reduced by more than 20 times. The use of microarc oxidation is promising for the preparation of composite coatings, which are a ceramic matrix in which solid lubricating dispersed particles are embedded. The technology of forming a matrix on aluminum, modified with dispersed magnetite, graphite and molybdenum disulfide, has been developed. According to the results of comparative tribotechnical tests, it was found that the intensity of linear wear of the material filled with MoS2 is 3 times, and Fe3O4 - 1.6 times lower than that of the coatings without filler. Based on the technology of microplasma electrolytic oxidation, an original technology has been developed for obtaining mineral-ceramic material, which is a matrix of aluminum oxide and dispersed diamond inclusions. Abrasive wheels made from this material have a consistently high volumetric cutting ability, 1.5-3.5 times higher than the traditional analogues and are characterized by high diamond retention. The possibilities of microplasma oxidation have not yet been fully explored, the most promising direction being the creation of nanostructured coatings for a specific technological task.

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Xia, Lingqin, Jianmin Han, Joseph P. Domblesky, Zhiyong Yang, and Weijing Li. "Investigation of the Scanning Microarc Oxidation Process." Advances in Materials Science and Engineering 2017 (2017): 1–12. http://dx.doi.org/10.1155/2017/2416821.

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Scanning microarc oxidation (SMAO) is a coating process which is based on conventional microarc oxidation (MAO). The key difference is that deposition in SMAO is achieved by using a stainless steel nozzle to spray an electrolyte stream on the substrate surface as opposed to immersing the workpiece in an electrolyzer. In the present study, SMAO discharge characteristics, coating morphology, and properties are analyzed and compared to results obtained from MAO under similar conditions. Results show that MAO and SMAO have comparable spark and microarc lifetimes and sizes, though significant differences in incubation time and discharge distribution were evident. Results also showed that the voltage and current density for MAO and SMAO demonstrate similar behavior but have markedly different transient and steady-state values. Results obtained from coating A356 aluminum sheet show that oxide thickness and growth rate in SMAO are strongly dependent on interelectrode spacing and travel speed. Analysis of the SMAO coating morphology and structure showed that a denser and slightly harder layer was deposited in comparison to MAO and is attributed to reduced porosity and increased formation of α-Al2O3. Preliminary results indicate that SMAO represents a viable process for coating of aluminum surfaces.

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Markov, M. A., D. A. Gerashchenkov, A. V. Krasikov, et al. "Porous Functional Coatings by Microarc Oxidation." Glass and Ceramics 75, no. 7-8 (2018): 258–63. http://dx.doi.org/10.1007/s10717-018-0067-9.

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Mi, T., B. Jiang, Z. Liu, and L. Fan. "Plasma formation mechanism of microarc oxidation." Electrochimica Acta 123 (March 2014): 369–77. http://dx.doi.org/10.1016/j.electacta.2014.01.047.

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Zhai, Dajun, Tao Qiu, Jun Shen, and Keqin Feng. "Mechanism of tetraborate and silicate ions on the growth kinetics of microarc oxidation coating on a Ti6Al4V alloy." RSC Advances 13, no. 8 (2023): 5382–92. http://dx.doi.org/10.1039/d2ra07755h.

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B4O72− dissolves molten TiO2 at high temperature, exposing filamentary channels and resulting in the repeated nucleation of microarc in the same area. SiO2 formed from SiO32− blocks the channels and induces microarc nucleation in other regions.

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Lv, Ying, Jun Gang Li, Ming Zhong Wu, Zhen Ma, Jing Qiang Zhang, and Le Le Wang. "Corrosion resistance of the microarc oxidation coatings prepared on magnesium alloy." E3S Web of Conferences 38 (2018): 02009. http://dx.doi.org/10.1051/e3sconf/20183802009.

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Ceramic coatings were prepared on the surface of AZ91D magnesium alloy by microarc oxidation technology. The effects of different voltages on morphology, phase composition and thickness of the coatings were characterized by SEM and XRD. The corrosion resistance of the coatings was measured by electrochemical workstation. Results indicated that the microarc oxidation coatings prepared in sodium silicate electrolyte exhibited porous surface and mainly comprised MgO, Mg2SiO4 and a small amount of MgAl2O4. The thickness of the oxide coatings increased rapidly with the increase of voltage. The coating prepared at 400V voltage had good electrochemical corrosion resistance in 3.5wt% NaCl solution.

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Mihin, S. O., D. N. Egorov, O. N. Koshkur, and A. E. Romanov. "TOPOLOGY OF MANUFACTURING A SORPTION-CAPACITIVE HUMIDITY SENSOR BASED ON THIN FILMS OBTAINED BY MICROARC OXIDATION AND MAGNETRON SPUTTERING." Kontrol'. Diagnostika, no. 304 (October 2023): 38–48. http://dx.doi.org/10.14489/td.2023.10.pp.038-048.

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The article describes the technological process of manufacturing a sorption-capacitive humidity sensor based on thin films of a sorbing moisture-sensitive layer implemented by microarc oxidation and a moisture-permeable electrode implemented by magnetron sputtering. The paper defines the technical requirements for the components of a sorption-capacitive humidity sensor. The electrical parameters of the moisture-sensitive layer are investigated depending on the component composition of the electrolyte and the modes of microarc oxidation. The geometrical parameters of the moisture-sensitive layer and the moisture-permeable electrode are presented, their structure and pore distribution are shown.

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Serikbekuly, N., K. D. Ormanbekov, A. B. Shynarbek, and A. Zh Zhassulan. "STUDY OF THE PROCESS OF COATING FORMATION DURING MICROARC OXIDATION OF TITANIUM." Bulletin of Shakarim University. Technical Sciences 1, no. 2(14) (2024): 370–78. http://dx.doi.org/10.53360/2788-7995-2024-2(14)-46.

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In this work, the structural-phase state of coatings formed on the surface of titanium by microarc oxidation (MAO) was studied. During the research, a number of experiments were carried out in which the process parameters and electrolyte composition were changed. Morphological and structural changes of the coatings were analyzed using various analytical methods, including electron microscopy and x-ray diffraction. Microarc oxidation of titanium was carried out in anodic potentiostatic mode for 10 minutes in various electrolytes based on phosphoric acid, sodium orthophosphate, potassium hydroxide and hydroxyapatite. After MDO, the microgeometry of the surface does not change, i.e. a thin coating 5-7 microns thick is formed on the titanium surface. The results of studying the surface of coatings using scanning electron microscopy showed that the most porous surface of all the studied coatings was found in coatings formed in an electrolyte with the addition of potassium hydroxide (KOH). The results of X-ray diffraction analysis showed that the main phase of the coatings are anatase and rutile. Electrolyte composition is one of the main factors in the MAO process. The research results allow us to deeply understand the process of coating formation during microarc oxidation of titanium.

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Anikin, K. A., A. A. Zhukov, V. N. Strapolova, and A. V. Apelfeld. "Effect of Microarc Oxidation Duration on the Characteristics of Thermal Control Coatings on Aluminum Alloy." Поверхность. Рентгеновские, синхротронные и нейтронные исследования, no. 6 (June 1, 2023): 45–51. http://dx.doi.org/10.31857/s1028096023060031.

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The influence of microarc oxidation process duration on the thickness, roughness and optical characteristics (solar absorbance αs and emissivity ε) of thermal control white and black cosmic coatings formed on an aluminum alloy AMg6 is studied experimentally. It is found that αs decreases with an increase in the thickness of coatings with increasing microarc oxidation treatment duration. For white coatings, a decrease in their roughness is accompanied by an increase in ε, and vice versa. For black coatings, the main role is played by the degree of blackness of the coating, which is determined by the content of vanadium oxide in it. A comparative analysis of the optical characteristics of thermally controlled coatings obtained using microarc oxidation process on various aluminum alloys showed that it is better to form white coatings of the “solar reflector” class on an aluminum alloy AMg3, and black coatings of the “true absorber” class – on an aluminum alloy AMg6 with MAO treatment duration of 25 min. The obtained experimental data can serve as a framework for the development of basic technology for the formation of thermal control cosmic coatings on products made of aluminum alloys.

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Sedelnikova, Maria B., Ekaterina G. Komarova, and Yurii Sharkeev. "Wollastonite and Calcium Phosphate Biocoatings with Zn- and Cu-Incorporation Produced by a Microarc Oxidation Method." Key Engineering Materials 695 (May 2016): 144–51. http://dx.doi.org/10.4028/www.scientific.net/kem.695.144.

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Investigations of wollastonite and calcium phosphate biocoatings with Zn-and Cu-incorporation produced by a microarc oxidation method were presented. Dependences of coating properties on the microarc oxidation parameters were revealed. A variation of the process parameters allowed us to produce wollastonite-calcium phosphate coatings with a plate-like structure, thickness of 25–30 μm, roughness of 2.5–5.0 μm, and enhanced strength properties. Coatings based on substituted hydroxyapatite deposited under voltages of 200–250 V have an X-ray amorphous structure. An increase of oxidation voltage to 300 V leads to the formation of crystalline phases in the coating, such as CaHPO4 and β-Ca2P2O7. The maximum content of 0.4 at% zinc and 0.1 at% copper was obtained for coatings based on Zn-and Cu-substituted hydroxyapatites, consequently, deposited under oxidation voltage of 250 V.

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LI, ZHENWEI, and SHICHUN DI. "MICROSTRUCTURE AND PROPERTIES OF MAO COMPOSITE COATINGS CONTAINING NANORUTILE TiO2 PARTICLES." Surface Review and Letters 24, no. 03 (2017): 1750115. http://dx.doi.org/10.1142/s0218625x17501153.

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Microarc oxidation (MAO) composite coatings containing rutile TiO2 were produced on 2024 aluminum alloy in an electrolyte with nanorutile TiO2 particles. The microstructure and properties of the composite coatings were analyzed by SEM, EDS, laser confocal microscope, XRD, Vickers hardness tester, scratch test and friction test, respectively. The results showed that the composite coatings consisted of [Formula: see text]-Al2O3, [Formula: see text]-Al2O3, mullite and rutile TiO2. With increasing concentration of rutile TiO2 particles in the electrolyte, the compactness of the composite coatings was improved significantly. The abrasion performance of the microarc oxidation composite coatings containing rutile TiO2 was better than that of MAO coatings without rutile TiO2.

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Xiao, Feng, Hui Chen, Jingguo Miao, and Juan Du. "Effect of oxidation time on the microstructure and properties of ceramic coatings prepared by microarc oxidation on 7A04 superhard aluminum alloy." International Journal of Modern Physics B 31, no. 16-19 (2017): 1744026. http://dx.doi.org/10.1142/s021797921744026x.

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Under the sodium aluminates’ system, microarc oxidation treatment was conducted on the superhard aluminum alloy 7A04 for different times. The microstructure of microarc oxidation ceramic layer was investigated by using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The influences of different oxidation times on the adhesion strength of ceramic layer and substrate, the morphology of surface and cross-section, the phase composition and the electrochemical properties were studied. The results indicated that the connection of the coating and substrate appears to be metallurgical bonding and dense ceramic layer, and the surface is in a “volcanic vent” morphology, which is composed of [Formula: see text]-Al2O3 and little [Formula: see text]-Al2O3. The corrosion resistance of ceramic layer is improved significantly in contrast with that of the substrate.

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Li, Dong-ying, Hai-mei Lin, Xiao-ming Wang, Meng-qi Li, Bin Wang, and Zi-xiong Zhou. "Nucleation and growth process of a softened-spark layer during microarc oxidation on a selective laser melted Ti alloy." RSC Advances 14, no. 36 (2024): 25975–85. http://dx.doi.org/10.1039/d4ra04704d.

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Zheng, Qiuxia, Zongbin Sun, Zhanhui Wang, et al. "Corrosion and biocompatibility behaviours of microarc oxidation/phytic acid coated magnesium alloy clips for use in cholecystectomy in a rabbit model." RSC Advances 11, no. 34 (2021): 20730–36. http://dx.doi.org/10.1039/d0ra09275d.

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DENISOV, V. A., and N. A. POPOV. "THE WEAR RESISTANCE OF CYLINDER LINERS RESTORED BY CERAMIC COATING." Tekhnicheskiy servis mashin 62, no. 1 (2024): 101–6. http://dx.doi.org/10.22314/2618-8287-2024-62-1-101-106.

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The results of the study of the workability and wear resistance of the combined coating of the restored cylinder liners obtained by applying a layer of aluminum powder to the cast-iron base by cold gas-dynamic spraying with subsequent treatment by microarc oxidation were presented. (Research purpose) The research purpose is a comparative analysis of the tribotechnical properties of the conjugations "sleeve coated with cold gas-dynamic spraying and treatment with microarc oxidation-counter-sample 100Cr6" and "sleeve (SH25 in the delivery state)-counter-sample 100Cr6" (reference pairing). (Materials and methods) Conducted a study of the workability of materials of the reference and reconstructed conjugations according to RD 50-662-88 "Guidelines. Methods of experimental evaluation of frictional compatibility of materials of friction conjugations". Comparative bench tests were performed on the wear resistance of the reference and restored conjugates according to GOST 23.224-86 "Ensuring the wear resistance of products. Methods for assessing the wear resistance of restored parts". (Results and discussion) The optimal modes of long-term operation and the limits of the interface operability were determined during the stepwise loading of the reference and restored tribo-couplings. The run-in coefficient and the wear factor of the couplings were calculated. It was found that the restored coupling "sleeve coated with cold gas-dynamic spraying and microarc oxidation treatment-counter-sample 100Cr6" has similar run-in rates with the reference coupling, and its wear resistance exceeds the wear resistance of the reference coupling by more than two times. (Conclusions) High indicators of workability and wear resistance of the restored interface "sleeve coated with cold gas-dynamic spraying and microarc oxidation treatment-counter-sample 100Cr6" in comparison with the reference sleeve (from SCH25 in the state of delivery) provide an increase in its durability and indicate the expediency of using the combined method in the restoration of cylinder liners.

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Shichkov, L. P., V. B. Lyudin, and A. V. Epelfeld. "Electrotechnology of microarc oxidation of light alloys." Traktory i sel hozmashiny 79, no. 6 (2012): 55–56. http://dx.doi.org/10.17816/0321-4443-69416.

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Features of electrotechnology of microarc oxidation of light (Al, Mg, Ti) alloys are considered. A module with current displacement effect was developed and described. It allows to control the ratio of cathode and anode currents and the rigidity of mode in condensing AC inverters which are widely used for this technology.

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Butyagin, P. I. "Effect of microarc oxidation by short-pulse mode parameters on composition, coating properties and process productivity." Perspektivnye Materialy 5 (2021): 82–88. http://dx.doi.org/10.30791/1028-978x-2021-5-82-88.

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This article presents the results of study of the influence of microarc oxidation parameters — ferquency and pulse duration — on the composition, properties of the coating, and also on the productivity of the microarc oxidation (MAO) process. It was found that the frequency in the range from 100 to 500 Hz significantly increases the formation rate of the MAO coating. A change in the composition and properties of the MAO coatings at pulse durations from 50 to 200 μs is observed. Starting with a pulse duration of 50 μs and a frequency of 400 Hz, the γ-Al2O3 crystalline phase is detected in the coating, the elemental composition, morphology, and microhardness of the coating change significantly.

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Xue, Wen Bin, Xiao Ling Wu, Jian Cheng Du, Xi Jin Li, and Hua Tian. "Structure and Properties of Microarc Oxidation Films on Zinc-Containing Aluminum Alloy." Materials Science Forum 546-549 (May 2007): 1145–48. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.1145.

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The wear and corrosion protective films were synthesized on the LC4 Al-Zn-Mg-Cu alloy by microarc oxidation (MAO) technique in an alkali-silicate electrolyte. The microstructure and composition profiles were investigated by scanning electron microscopy and energy dispersive spectroscopy, and the phase structure was performed by X-ray diffraction. The corrosion resistance of coated LC4 alloy was evaluated using potentiodynamic polarization curves. The MAO film consists of γ-Al2O3, α-Al2O3 and amorphous SiO2 phases. The film up to 210 μm contains two layers. The Si element from electrolyte enriched in the outer layer film. After microarc oxidation treatment, the microhardness and corrosion resistance of LC4 alloy were improved significantly.

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Butyagin, Pavel I., Svetlana S. Arbuzova, Anton V. Bolshanin, and Anton I. Kondratenko. "Technological and ecological aspects of microarc oxidation." Electroplating and Surface Treatment 28, no. 2 (2020): 29–38. http://dx.doi.org/10.47188/0869-5326_2020_28_2_29.

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Vladimirov, B. V., B. L. Krit, V. B. Lyudin, et al. "Microarc oxidation of magnesium alloys: A review." Surface Engineering and Applied Electrochemistry 50, no. 3 (2014): 195–232. http://dx.doi.org/10.3103/s1068375514030090.

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Borisov, A. M., B. L. Krit, V. B. Lyudin, N. V. Morozova, I. V. Suminov, and A. V. Apelfeld. "Microarc oxidation in slurry electrolytes: A review." Surface Engineering and Applied Electrochemistry 52, no. 1 (2016): 50–78. http://dx.doi.org/10.3103/s106837551601004x.

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Krit, B. L., V. B. Ludin, N. V. Morozova, and A. V. Apelfeld. "Microarc Oxidation of Carbon-Graphite Materials (Review)." Surface Engineering and Applied Electrochemistry 54, no. 3 (2018): 227–46. http://dx.doi.org/10.3103/s1068375518030080.

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Сағидұғұмар, А. "OBTAINING CALCIUM-PHOSPHATE COATINGS BY MICROARC OXIDATION." BULLETIN of D. Serikbayev EKTU 2 (June 30, 2023): 177–86. http://dx.doi.org/10.51885/1561-4212_2023_2_177.

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В этом обзоре рассмотрены история развития и текущее состояние метода микродугового оксидирования (МДО), а также химические, электро-плазмохимические механизмы формирования слоев. Изучены различные типы и стадии явления плазменно-электролитного разряда, описано влияние состава электролита и электрических режимов на морфологию и состав полученных покрытий. Рассмотрены работы, посвященные нанесению кальций-фосфатных покрытий методом МДО на медицинские титановые сплавы для улучшения антикоррозионных, износостойких и биоактивных свойств покрытия. Медицинские титановые сплавы с кальций-фосфатным покрытием могут применяться в ортопедии, стоматологии, а также в области создания биоактивных биомиметических структур. Преимущества метода МДО заключаются в возможности осаждать кальций-фосфатные покрытия на имплантатах различной формы, в том числе и на пористых, а также получать покрытия с заданным фазовым и элементным составом. Поэтому понимание влияния электролитических режимов и состава электролитов на формирование кальций-фосфатных покрытий материалов для замены и восстановления костной ткани является актуальной проблемой. Целью данной работы является анализ новых тенденций и оптимальных режимов для нанесения кальций-фосфатных покрытий на медицинские титановые сплавы методом МДО.

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Wang, Y. Q., Y. Z. Deng, Y. W. Shao, and F. H. Wang. "New sealing treatment of microarc oxidation coating." Surface Engineering 30, no. 1 (2013): 31–35. http://dx.doi.org/10.1179/1743294413y.0000000195.

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Rakoch, A. G., I. V. Bardin, V. L. Kovalev, and T. G. Avanesyan. "Microarc oxidation of light constructional alloys: Part 1. Main notions on the microarc oxidation of light constructional alloys." Russian Journal of Non-Ferrous Metals 54, no. 4 (2013): 341–44. http://dx.doi.org/10.3103/s1067821213040135.

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Lao, Xing Sheng, Xu Feng Zhao, Yong Liu, Chun Hui Dai, and Wei Jian Lv. "Experimental Study on Friction Characteristics of Micro-Arc Oxidation Modified Layer on Titanium Alloy Surface." Materials Science Forum 990 (May 2020): 44–49. http://dx.doi.org/10.4028/www.scientific.net/msf.990.44.

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In order to study the effect of microarc oxidation modification treatment on the friction properties of titanium alloy surface, the surface treatment layer of Ti-6Al-4V ELI specimen modified by Microarc oxidation surface was sampled, the surface layer hardness, roughness and treatment layer thickness were tested, the microscopic morphology was analyzed, The friction tests of TC4 substrate and micro-arc oxidation treatment surface disc with 25% glass fiber, 15% fiberglass +5% graphite and 60% tin bronze reinforced PTFE pin were carried out, and the results showed that the thickness increased slightly and the surface layer hardness increased by about 75% after the micro-arc oxidation surface modification treatment. Compared with the substrate, the surface roughness is obviously improved, and the friction coefficient of the surface treatment specimen is similar to that of the TC4 titanium alloy substrate, but the wear amount is higher than that of the TC4 titanium alloy substrate.

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Godzhayev, Z. A., S. D. Zaytsev, O. V. Somov, and I. V. Suminov. "Wear resistance and tribological properties of nanostructured composites obtained by the microarc oxidation technique." Traktory i sel hozmashiny 80, no. 2 (2013): 38–41. http://dx.doi.org/10.17816/0321-4443-65921.

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Li, Shu Hua, Yu Jun Yin, Da Wei Shen, Yuan Yuan Zu, and Chang Zheng Qu. "Tribological Performance of Ceramic Composite Coatings Obtained through Microarc Oxidation on Ly12 Aluminum Alloy." Key Engineering Materials 537 (January 2013): 7–11. http://dx.doi.org/10.4028/www.scientific.net/kem.537.7.

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A dense ceramic oxide coating approximately 30µm thick was prepared on a Ly12 Al alloy by microarc oxidation in an alkali-silicate electrolytic solution. The morphology and microstructure were analyzed by scanning electron microscope (SEM) and X-ray diffraction (XRD). Coating thickness and surface roughness (Ra) were measured after the coating had been synthesized. The tribological performance of the coatings was evaluated using a dry sand abrasion test and a solid particle erosion test. The results show that microarc oxidation coatings consist of the loose superficial layer and the inner dense layer. Both inner layer and out layer are composed of α-Al2O3 and γ-Al2O3, While the Al6Si2O3 phase is observed only in out loose layer. The average of the microhardness of the coating is 2096Hv.

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Zhassulan, A., B. Rakhadilov, D. Baizhan, A. Shynarbek, and K. Ormanbekov. "Investigation of the process of coating formation during microarc oxidation of titanium." BULLETIN of the L.N. Gumilyov Eurasian National University. PHYSICS. ASTRONOMY Series 143, no. 2 (2023): 6–15. http://dx.doi.org/10.32523/2616-6836-2023-143-2-6-15.

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The structural and phase states of coatings formed on the surface of titanium by the method of microarc oxidation (MAO) are investigated. In the course of the study, a series of experiments were conducted with varying process parameters and electrolyte composition. Morphological and structural changes of the coatings were analyzed using various analytical methods, including electron microscopy and X-ray diffraction. Microarc oxidation of titanium was carried out in anodic potentiostatic mode for 10 minutes in various electrolytes based on phosphoric acid, sodium orthophosphate, potassium hydroxide and hydroxyapatite. After the MАO, the microgeometry of the surface does not change, i.e. a thin coating with a thickness of 5-7 microns is formed on the surface of titanium. The results of the examination of the coating surface by scanning electron microscopy showed that the coatings formed in an electrolyte with the addition of potassium hydroxide (KOH) have the most porous surface of all the coatings studied. The results of X-ray diffraction showed that anatase and rutile are the main phase in coatings. The composition of the electrolyte is one of the determining factors of the MАO process and is crucial for the application of MАO. The results of the study allow us to gain a deep understanding of the process of coating formation during microarc oxidation of titanium.

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Zhukovsky, A. V., and B. V. Shandrov. "Monitoring of Microarc Oxidation Process with Application of personal computer." Izvestiya MGTU MAMI 3, no. 1 (2009): 121–23. http://dx.doi.org/10.17816/2074-0530-69956.

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The article considers monitoring of the microarc oxidation process via PC. A series of computer programs is developed. The obtained results allow to assess the sustainability of the process in various modes and at different stages of the process of oxidation and to determine the time of transition to a dangerous regime.

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Sun, Haiou, Liangcai Li, Zhongyi Wang, Bin Liu, Meng Wang, and Yunliang Yu. "Corrosion Behaviors of Microarc Oxidation Coating and Anodic Oxidation on 5083 Aluminum Alloy." Journal of Chemistry 2020 (November 20, 2020): 1–11. http://dx.doi.org/10.1155/2020/6082812.

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The microarc oxidation (MAO) coating and anodic oxidation coating were prepared on 5083 aluminum alloy. The surface morphology, elemental composition, and electrochemical behavior of the two coatings were analyzed. The results proved that the corrosion resistance of the MAO coating is superior than that of the anodic oxidation coating. The protective ability of the coating deteriorated gradually with the increase in immersion time. The corrosion process is controlled by ion diffusion throughout the coatings.

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CHEN, TINGFANG, YONGLIANG LI, WENBIN XUE, CHAOLIN YANG, YAO QU, and MING HUA. "INFLUENCE OF MICROSTRUCTURE OF FRICTION STIR WELDED JOINTS ON GROWTH AND PROPERTIES OF MICROARC OXIDATION COATINGS ON AZ31B MAGNESIUM ALLOY." Surface Review and Letters 22, no. 02 (2015): 1550029. http://dx.doi.org/10.1142/s0218625x15500298.

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Ceramic coatings on friction stir welded (FSW) joints of AZ31B magnesium alloy were fabricated by microarc oxidation (MAO) method in silicate electrolyte. Microstructure, phase constituents, microhardness and electrochemical corrosion behaviors of bare and coated magnesium alloys at different zones of FSW joints for different oxidation time were investigated. The influence of microstructure at different zones on the growth of MAO coatings was analyzed. The results show that the MAO coatings on FSW joints are uniform, and they have almost the same morphology, phase constituents, hardness and corrosion resistance at base metal, stir zone and heat-affected zone. The properties of MAO coatings are independent on the microstructures of AZ31B alloy. In addition, the microstructures of magnesium alloy near the coating/alloy interface at different zones of FSW joint was not changed by microarc discharge process.

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Перетягина, А. Д., and В. Ю. Цибульникова. "Prospects for the use of microarc oxidation to increase the efficiency of metal products production." Journal of Applied Research, no. 2 (March 2, 2024): 93–99. http://dx.doi.org/10.47576/2949-1878.2024.2.2.013.

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В статье рассмотрены проблемы и перспективы развития отрасли производства металлических изделий, в том числе применение технологии микродугового оксидирования для повышения эффективности. Рассмотрена динамика основных показателей развития, показан спрос на защитное покрытие металла, в том числе на микродуговое оксидирование. Выявлено, что потребление металлоконструкций возрастает, а также растет потребность в повышении износостойкости металлических конструкций на более долгий срок. The article discusses the problems and prospects for the development of the metal products industry, including the use of microarc oxidation technology to increase efficiency. The dynamics of the main development indicators is considered, the demand for a protective metal coating, including microarc oxidation, is shown. It has been revealed that the consumption of metal structures is increasing, as well as the need to increase the wear resistance of metal structures for a longer period of time is growing.

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Fu, Ming, Jun Ming Li, and Hui Cai. "Mono-Component-Solution Controlled Growth of Microarc Oxidation Coatings on Aluminum Substrates." Advanced Materials Research 1088 (February 2015): 358–62. http://dx.doi.org/10.4028/www.scientific.net/amr.1088.358.

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The growth of microarc oxidation (MAO) coatings on aluminum substrates was controlled by different mono-component solutions, involving (NaPO3)6, Na3PO4, Na2SiO3 and Na2MoO4 aqueous electrolyte. The results show that (NaPO3)6 solution can accelerate the growth of MAO coating, revealed by the maximum coating thickness of 12.1 μm; and meanwhile, Na2SiO3 solution favors the doping of solute elements during MAO, suggested by 10.75 at.% Si in coating. Furthermore, the variety of mono-component solution also affects the porous structure of MAO coating. It is assumed that the property of coating/solution interface is influenced by solution variety, while the interfacial property determines the solidification of ceramic particles and the adsorption of solute anion during microarc discharge, thus realizing controlled growth of MAO coating.

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