High Mechanical Characteristics Research Articles

Features of the Behavior of Highly Frost-Resistant Modified Concretes

One of the main criteria of construction is reliability and durability. Therefore, for the implementation of modern construction projects, especially in harsh operating conditions, cement composites with increased resistance to aggressive external cyclic influences are necessary. For the climatic conditions of the Russian Federation, special attention should be paid to ensuring the frost resistance of concrete. Thus, in accordance with GOST 31384–2017 “Protection of concrete and reinforced concrete structures from corrosion. General technical requirements”, for the lowest temperature and under the condition of alternating freezing and thawing of concrete in a saturated state, the frost resistance mark must be at least F2450. In addition, high mechanical characteristics of the materials used, including the modulus of elasticity, are required, for example, in the construction of infrastructure facilities in the Arctic zone of Russia. To ensure these characteristics, effective modifying additives must be introduced into the concrete mix. However, there is evidence in the literature that water-reducing additives of various genesis, with similar values of water reduction, have different effects on the structure of the formed cement stone. Therefore, in order to ensure high durability of concrete, this article will consider the relationship between the emerging structure of cement stone in concrete and its resistance parameters.

FILM MATERIALS BASED ON POLYVINYL ALCOHOL, FILLED WITH SILVER NANOPARTICLES

In the present work polymeric composite films materials based on polyvinyl alcohol (PVA), glycerol and silver nitrate the conducted composites with high mechanical characteristics were created. In the process of composites drying, glycerol acts as a reducing agent and the formation of silver nanoparticles occurs, moreover the reducing take places at room temperature. The AgNO3 content is varied from 0.01 to 30 wt.%. Taking into account the physical-mechanical and conducting properties of composites, it is established that the optimum content of glycerol in the final material is equal to 30 wt%. The formation of metallic silver was confirmed by an appearance of a surface plasmon resonance band at 420-430 nm in UV spectra and the appearance of two diffraction peaks at 38.17° and 44.15° in X-ray diffraction pattern as well, corresponding to the crystallographic planes (111) and (200) of a face centered cubic lattice of Ag0. Dielectric spectroscopy data show that the increasing of glycerol content up to 30-40 wt.% leads to enhance the conductivity by three orders in comparison with the initial PVA. An increase in the silver content resulted in further rise of the conductivity, reaching value of 5.72 10-6 S/cm at 15 wt.% of silver concentration, at room temperature (20 °C). At 100-120 °С, the conductivity was the highest for the composite with 25 wt.% of AgNO3 - 3.67-3.84 10-4 S/cm. The resulting samples had high physical and mechanical properties: relative elongation of about 400%, tensile strength of 32–36 MPa. Studies of the dynamic light scattering of films solution with Ag NPs showed that the smallest size was for the sample with 0.5 wt.% - 6.3 nm.

Preparation of ionic liquid modified graphene and its effect on enhancing the properties of PA6 composites

AbstractIn this study, an ionic liquid (IL) with imidazole and amide groups has been prepared, and used to modify graphene (TSG) by ball milling to fabricate ionic liquid functional graphene (TSG‐IL). During the melt blending process, TSG‐IL forms hydrogen bond with the amide group of PA6, which destroys the hydrogen bond of PA6 itself, enhances the interfacial force between TSG‐IL and PA6 matrix, and improves the dispersion of TSG‐IL in PA6 matrix. There has been some improvement in the mechanical and thermal conductivity of PA6 composites. Additionally, the presence of amide groups makes it easy to form hydrogen bonds between TSG‐IL sheets, thus strengthening the connection between TSG‐IL and each other, which is conducive to the construction of thermal conductivity network. The findings indicate that compares to TSG/PA6 composites with the same filler amount, the TSG‐IL/PA6 composites have better heat conductivity and higher mechanical characteristics. 9 wt.% TSG‐IL/PA6 composite has the highest thermal conductivity (0.498 W·m−1·k−1), which is 92.3% and 17.2% greater than that of pure PA6 and 9 wt.% TSG/PA6, and its impact strength (11.12 kJ/m2) is 11.0% and 7% higher, which would be a popular candidate material in the field of thermal conductivity.Highlights Imidazole ionic liquids with amide groups was synthesized. Amide groups were modified onto graphene sheets by ball‐milling. The dispersion of TSG‐IL in PA6 was studied. Improved mechanical property and thermal conductivity of TSG‐IL/PA6 composites.

PROPERTIES INVESTIGATION OF POLYESTER RESIN COMPOSITE MATERIALS AND PRODUCTS

The use of composite materials in construction is a promising direction due to their potential to reduce costs and improve the operational characteristics of building structures. The results of this study will allow to determine the optimal formulations and manufacturing technologies of polymer composite materials for use in construction. In this paper, a detailed analysis of the composite material based on polyester resin (polymer sand concrete) used for the manufacture of hatch covers for manholes in water supply and sewage systems is carried out. The main components of the considered composition are quartz sand, unsaturated polyester resin, hardening accelerator - cobalt naphthenate solution and hardener - benzoyl peroxide. As part of the study, the improvement of the composite material’s properties is also considered by adjusting the technological modes of formation. Special attention was paid to the analysis of the hardness of the samples after the research, since this parameter determines the resistance of the material to wear. The effect of different ratios of these components on the physical and mechanical properties of the final material was studied. It was experimentally determined how the consumption of polyester and hardener affects the compressive strength, bending strength, impact toughness and hardness of the composite material. To obtain optimal characteristics, the STATISTICA 12 software package was used to specify the values of the factors that lead to maximum compressive and bending strength. The results of the research are presented in the conclusions in the form of quantitative indicators that indicate the optimal composition to achieve high physical and mechanical characteristics. The response surfaces of the variation factors’ influence on the properties of interest are shown. Keywords: composite material, polymer sand concrete, quartz sand, polyester resin, hardening accelerator - cobalt naphthenate solution and hardener - benzoyl peroxide

Mix design optimization of metakaolin-slag-based geopolymer concrete synthesis using RSM

Geopolymers have attracted considerable attention recently due to their promising environmental and economic benefits. This study used alkali activation to create an environmentally friendly material with good workability and high mechanical qualities from metakaolin from Oulmès, Morocco, and SONASID-Jorf steel factory slag (BFS). The authors optimized geopolymer synthesis using mixture design and Response Surface Methodology. The results demonstrate the importance of components in ANOVA modelling. This is evidenced by the high experimental Fisher factor (FCv = 16.8916 and FSt = 20.5902), which exceeds the critical value of the Fisher factor (Fc = 15.52) according to the F-test. In addition, the high values of the coefficient of determination (R2) and the adjusted coefficient of determination (R2Adj) indicate strong correlations between the experimental and calculated values (R2Cs = 95.48 % and R2Adj-Cs = 89.83 %, and R2St = 96.26 % and R2Adj-St = 91.58 %). Furthermore, the response surface analysis in the range of variables suggests that metakolin, blast furnace slags, and alkaline activation solution are best for the synthesis of a 35.31 MPa geopolymer. Under ideal conditions, Fourier transform infrared spectroscopy (FTIR) revealed bands associated with the asymmetric strain modes Si–O–Si and Al–O–Si in the metakaolin-BFS-based geopolymer. Similarly, X-ray diffraction (XRD) analysis shows a remarkable peak between 15° and 40° in 2Ɵ, indicating a significant growth rate of the amorphous phase corresponding to geopolymer formation. This study shows that design of experiments and response surface methods can optimize geopolymer synthesis, producing a material with high mechanical characteristics and good workability.

Effects of hydroxyapatite-coated porous titanium scaffolds functionalized by exosomes on the regeneration and repair of irregular bone.

As a traditional bone implant material, titanium (Ti) and its alloys have the disadvantages of lack of biological activity and susceptibility to stress shielding effect. Adipose stem cells (ADSCs) and exosomes were combined with the scaffold material in the current work to effectively create a hydroxyapatite (HA) coated porous titanium alloy scaffold that can load ADSCs and release exosomes over time. The composite made up for the drawbacks of traditional titanium alloy materials with higher mechanical characteristics and a quicker rate of osseointegration. Exosomes (Exos) are capable of promoting the development of ADSCs in porous titanium alloy scaffolds with HA coating, based on experimental findings from in vitro and in vivo research. Additionally, compared to pure Ti implants, the HA scaffolds loaded with adipose stem cell exosomes demonstrated improved bone regeneration capability and bone integration ability. It offers a theoretical foundation for the combined use of stem cell treatment and bone tissue engineering, as well as a design concept for the creation and use of novel clinical bone defect repair materials.

3D g-C3N4 porous nanoribbons pillared-MXene/ PVA nanocomposite: An architecture with high dielectric, breakdown strength, thermal conductivity, and mechanical strength characteristics

In polymer nanocomposites with conductive fillers, obtaining boosted dielectric constant, breakdown strength, lower dielectric loss concurrently, and mixing to build a homogeneous structure is challenging. In this work, 3D g-C3N4 porous nanoribbons pillared-MXene/PVA nanocomposite (MXene/CNNR/PVA) was fabricated. The solution casting method was utilized for embedding Mxene/CNNR into poly (vinyl alcohol) (PVA) to produce MXene/CNNR/PVA dielectric composites. The maximum observed electrical displacement is 10.95 μC/cm2 at (T = 25 °C and E = 400 MV/m). Furthermore, the obtained density of discharged energy is 18.11 J/cm3, much higher than that of pristine PVA (4.21 J/cm3 at E = 200 MV/m). The relative permittivity of 3.5 wt% ternary composites (MXene/CNNR/PVA) at 25 °C and 1000 Hz is 25.1, and the loss is just 0.03. Moreover, the combined use of MXene and CNNR results in a synergistic effect; the MXene/CNNR/PVA composite films exhibit more incredible mechanical characteristics compared to pure PVA nanocomposite modified by MXene alone, with notable increases in tensile strength and Young’s modulus while retaining the majority of its elasticity.

Research of Nano-modified Plain Cement Concrete Mixtures and Cement-Based Concrete

The use of complex modifiers for plain cement concrete mixtures and concrete is becoming increasingly popular in modern materials science. The article presents studies of the influence of a polymer additive structured by carbon nanomaterials on physical and mechanical characteristics of plain cement concrete mixtures. IR spectroscopy and thermogravimetry have shown that the use of carbon nanomaterials significantly altered the structure of plain cement concrete mixtures. As a result of the fact that the high-strength nanomaterial is the center of crystallization of cement rock newly formed structures, a denser reinforced microstructure is formed, which significantly increases the strength properties of plain cement concrete mixtures. The inclusion of a polymer complex additive in plain cement concrete mixtures leads to higher and longer plasticizing, which plays an important role in the production of monolithic products. It was determined that, in the presence of a complex modifier (polymer additive structured by carbon nanotubes), the crystalline structure of calcium hydrosilicates is compacted, which causes high physical and mechanical characteristics of modified plain cement concrete mixtures. It has been experimentally shown that the additive Ethacryl HF (France) from the class of polycarboxylates, chosen for research, acts as an accelerator for setting and curing cement paste, and also increases its strength characteristics. In general, in this study, there is a water-reducing effect from the application of the additive for all plain cement concrete mixtures. Water requirements are reduced by 5 mas. %, while the strength is increased by 19%. The formulation of plain cement concrete mixtures modified by polymer additives, structured by carbon nanotubes, with high performance were developed.

Masonry Wall Reinforcement

Unreinforced masonry has been used as a construction material for thousands of years. Whilesome of these structures survive to this day, these tend to have massive walls and would be unpractical formodern use. Unreinforced masonry can be reinforced with proper masonry techniques. As a result,reinforced and confined types of masonry were developed to exploit the strength potential of masonry andto solve its lack of tensile strength, significantly improving not only resistance, but also ductility andenergy dissipation capacity.Fiber reinforced polymer composites have emerged as an effective means of reinforcing masonrystructures due to their high mechanical characteristics, low weight and durability. The role of FRPmaterials is to act as a tensile reinforcement which can be used to improve the ability of a wall against inplane shear and/or out-of-plane bending.This contribution, based on experimentation and numerical modelling, aims at a better understanding ofthe behaviour of structures in masonry. Multiple reinforcement techniques and methods are illustrated inthis summary, such as the reinforcement of masonry walls by composite materials like CFRP (CarbonFiber Reinforced Polymer) and glass fibre reinforced polymer (GFPR), also there are Near surfacemounted (NSM), carbon fibers reinforced polymer (CFRP) and other techniques are cited in this work.

Tribologic behavior and surface integrity of NAB bronze coatings reinforced with WC and Cr3C2 carbides using ytterbium fiber laser

Nickel-aluminum bronzes (NAB) are widely used in different applications due to their high mechanical properties and operational characteristics. These properties can be further improved using different finishing processes. This paper’s objective involves the wear and surface integrity characterization of CuAl7Ni6P bronze coatings formed firstly by plasma spraying and then by laser alloying with WC and Cr3C2 carbides. The YLR-2000 fiber ytterbium laser was used for laser processing and the effect of process conditions, namely a laser spot speed (LSS) and a square of the laser spot (SLS)was studied under 500 N and 1000 N loads. It was revealed that processing parameters do not have a significant effect on microhardness and friction process factors, but have significant effect on carbide alloying results. Under load of 500 N wear rates have an advantage up to 5–6 times regardless of the processing parameters and the type of reinforcing particulates. Under load of 1000 N alloying advantage is very high: 15–20 times using Cr3C2, and even 30–50 times using WC compared with results obtained for plasma spraying. These results are very important when choosing NAB laser processing input parameters in industrial applications.

Pulsed TIG Cladding of a Highly Carbon-, Chromium-, Molybdenum-, Niobium-, Tungsten- and Vanadium-Alloyed Flux-Cored Wire Electrode on Duplex Stainless Steel X2CrNiMoN 22-5-3

The hardfacing process aims to increase the life span of structural components in the petrochemical, mining, nuclear and automotive industries. During operation, these components are subject to demands of abrasion wear, cavitation erosion and corrosion. Duplex stainless steels are characterized by high mechanical characteristics and corrosion resistance, but poor behavior to abrasive wear and cavitation erosion. The improvement in wear resistance is possible by selecting and depositing a special alloy on the surface using a joining technique that ensures a metallurgical bonding between the layer and the substrate. The experimental investigations carried out in this work demonstrate the ability of the TIG pulsed welding process to produce layers with good functional properties for engineering surfaces. The “Corodur 65” alloy was deposited on a duplex-stainless-steel substrate, X2CrNiMoN22-5-3, using a series of process parameters that allowed for the control of the cooling rate and heat input. The properties of the deposited layers are influenced not only by the chemical composition, but also by the dilution degree value. Since the deposition of layers through the welding operation can be considered as a process with several inputs and outputs, the control of the input parameters in the process aims at finishing the granulation and the structure in the fusion zone as well as limiting the segregation phenomena. The aim of this work is to investigate the microstructural characteristics of the iron-based alloy layer, Corodur 65, deposited via pulsed current TIG welding on duplex X2CrNiMoN22-5-3 stainless-steel substrates.

Porous Material (Titanium Gas Diffusion Layer) in Proton Exchange Membrane Fuel Cell/Electrolyzer: Fabrication Methods & GeoDict: A Critical Review

Proton exchange membrane fuel cell (PEMFC) is a renewable energy source rapidly approaching commercial viability. The performance is significantly affected by the transfer of fluid, charges, and heat; gas diffusion layer (GDL) is primarily concerned with the consistent transfer of these components, which are heavily influenced by the material and design. High-efficiency GDL must have excellent thermal conductivity, electrical conductivity, permeability, corrosion resistance, and high mechanical characteristics. The first step in creating a high-performance GDL is selecting the appropriate material. Therefore, titanium is a suitable substitute for steel or carbon due to its high strength-to-weight and superior corrosion resistance. The second crucial parameter is the fabrication method that governs all the properties. This review seeks to comprehend numerous fabrication methods such as tape casting, 3D printing, freeze casting, phase separation technique, and lithography, along with the porosity controller in each process such as partial sintering, input design, ice structure, pore agent, etching time, and mask width. Moreover, other GDL properties are being studied, including microstructure and morphology. In the future, GeoDict simulation is highly recommended for optimizing various GDL properties, as it is frequently used for other porous materials. The approach can save time and energy compared to intensive experimental work.

Structure and properties of CoCrFeNiMnBe high-entropy alloy films obtained by melt quenching

In this study nanostructured films of the Co16.67Cr16.67Fe16.67Mn16.67Ni16.67Be16.67 high-entropy alloy have been synthesized by the method of melt quenching. The structure and physical properties of melt quenched films and as-cast specimens of identical composition were investigated. The XRD patterns allowed us to establish that the investigated alloy in the as-cast state has a multiphase structure in which there are the FCC phase with lattice parameter a = 0.3598 nm, BCC phase (a = 0.2872 nm), and B2-type intermetallic compounds BeNi(Co) (a = 0.2616 nm). At the same time, the melt quenched sample has a structure consisting of the FCC phase (a = 0.3579 nm), the BeNi(Co) phase (a = 0.2610 nm) and the minor BCC phase. Both as-cast specimens and melt quenched films reveal a typical ferromagnetic behavior and exhibit semi-hard magnetic properties and high mechanical characteristics.

Effect of Short Carbon Fiber Reinforcement on Mechanical Properties of 3D-Printed Acrylonitrile Butadiene Styrene.

The effect of short carbon fiber (SCF) filler on the mechanical properties of 3D-printed acrylonitrile butadiene styrene (ABS) was investigated. The fused filament fabrication (FFF) method was used for the manufacturing of samples. Elastic properties and strength characteristics of samples made of conventional ABS and SCF-reinforced ABS were compared in tensile and bending tests. Fracture toughness and critical strain energy release rate were also determined. In addition, 3D-printed monofilament SCF-reinforced samples were fabricated, the internal structure of which was analyzed using microcomputed tomography (micro-CT). Based on the tomography data, finite-element (FE) models of representative volume elements (RVEs) of the reinforced material were created and used for the numerical calculation of effective characteristics. Numerical and experimental results for the effective elastic properties were compared with the Mori-Tanaka homogenization technique. The ABS samples filled with SCF showed considerably higher mechanical characteristics than those of the conventional ABS. Finally, the dependence between the strength characteristics and elastic properties of the samples on the diameter of the nozzle used for 3D printing was established. 3D-printed ABS reinforced with SCF demonstrated a gain in tensile strength and fracture toughness by 30% and 20%, respectively. Interlayer adhesion strength in flexure tests showed an increase of 28% compared to pure ABS samples.

Influence of weave arrangements on mechanical characteristics of cotton and bamboo woven fabric reinforced composite laminates

Due to the increasing demand for environmentally safe products, the use of composites manufactured from natural fibres has become one of the most widely researched subjects lately. In this present study, the influence of weave designs on the mechanical characteristics of bio-based cotton, bamboo and cotton/bamboo fabric reinforced textile epoxy composites is presented. The textile composites were prepared by compression moulding process with different fabric weight ratio of 70:30; 65:35; 60:40; 55:45 and 50:50. The composites were tested for interlaminar shear, flexural, compressive, tensile and impact strength as per ASTM standards. Compared to other weave design composite laminates, 45 wt.% loading of cotton and bamboo textile composite achieved the greatest results for all the tests in a simple weave pattern. The scanning electron microscopy results of the fractured samples exhibited superior interfacial bonding between the fabric and matrix, as evidenced by the presence of significantly reduced fibre bend, fibre pullout, tearing and crack. The prepared natural fibre composites (cotton/bamboo) can be used as an eco-friendly alternative to man-made materials that aid in pollution management. They are also less expensive, have higher mechanical characteristics and use less energy in the manufacturing process.

Effect of utilizing peanut husk ash on the properties of ultra-high strength concrete

Cement production is classified as a highly contaminating process in recent decades, and numerous efforts have been accomplished to reduce cement used in construction for more sustainability. Cement complementary materials make an ecological impact on its manufacturing, in which the cement production cost can be reduced. In this investigation, peanut husk ash (PHA), as a newly abundant agro-industrial waste ash, was used as a substitution for ordinary Portland cement (OPC) in ultra-high-strength concrete (UHSC). PHA was heat-treated at various temperatures of 400, 500, 600, and 700 °C and utilized with substitution rates of 2.5%, 5.0%, and 7.5%. In addition, recycled granite was utilized as a coarse aggregate in UHSC. Thirteen mixes were prepared and tested to examine the fresh, mechanical, physical, and microstructure characteristics of the proposed UHSC. Concrete slump, compressive strength, indirect tensile strength, flexural strength, bond strength, modulus of elasticity, and water permeability were the measurements in this study. In addition, microstructure characteristics were obtained through X-ray diffraction analysis (XRD), thermo gravimetric analysis (TGA), and scanning electron microscope (SEM). The acquired outcomes revealed that utilizing 5% PHA as a partial substitution of OPC achieved high mechanical characteristics, and the optimal temperature for treating the peanut husk ash was 600 °C. The results of this experimental investigation can contribute well to illustrating the effect of utilizing PHA as a novel agricultural waste ash in UHSC to achieve significant financial benefits and a favorable ecological impact.

Experimental investigation on mechanical and tribological characteristics of snake grass/sisal fiber reinforced hybrid composites

Abstract An experiential research on mechanical and tribological characteristics of snake grass and sisal fiber reinforced hybrid polymer (epoxy) composites was carried out and reported in this article. The snake grass and sisal fibers were initially treated with 5% sodium hydroxide (NaOH). Hybrid composite samples were fabricated using a compression moulding technique with a total fiber weight ratio of 30% and an epoxy resin weight ratio of 70%. The proportions of snake grass and sisal fibers in the hybrid composites were 70:30, 50:50, and 30:70. The fabricated hybrid composite samples were subjected to flexural, tensile, interlaminar shear strength, Shore D hardness, water absorption, and wear tests as per ASTM international standards, and the outcomes were compared with the results of snake grass and sisal mono fiber composites. The results disclosed that the 30:70 (SG:S) hybrid composite has higher mechanical characteristics than those of other hybrid and mono fiber composites. Also, the 30:70 hybrid sample performed at par with the sisal mono composite in wear and water absorption characteristics. Optical microscopy examination of alkali-treated natural hybrid and mono fiber composites displayed excellent results in terms of interfacial bonding between polymer and fiber.

Работа связевых стальных каркасов с учетом погрешностей монтажа и изготовления

Introduction. As a building construction material, steel is widely used because of its high mechanical characteristics. Steel load-bearing structures of multi-storey buildings are a system formed by columns, beams, floor slabs and braces. The frame of a multi-storey building has a large number of elements and their connections. Errors in the fabrication, installation and operation of steel frames of multi-storey buildings can lead to a reduction in the load-bearing capacity of structures compared to the design. Deviations from the design position occur because of violations of the technical operatin.rules of the buildings beyond the permissible limits, design errors, imperfect standards and poor quality of work during the fabrication and installation of structures. The current Russian standards do not take into account the impact of fabrication and installation errors on the work of multi-storey frames. The initial geometric defects in the structural system and its individual elements contribute to the difference in performance between the real construction and an idealized one. Materials and methods. The study of the effect of initial imperfections on the stress-strain state of the steel frame is important and relevant. Initial imperfections are taken into account either by applying an equivalent load to the idealized design scheme or by forming a geometrically distorted by imperfections design scheme. The analysis can be linear or geometrically non-linear. Results. The results of the study of braced steel framework performance in the presence of initial imperfections are presented. The effect of initial imperfections in the form of deflection of columns from the vertical is considered. The values of the initial imperfections are determined in accordance with the current RF standards. Conclusions. The results obtained have made it possible to propose a correction factor to the results of the calculation of frames with imperfections to the results of the calculation of an idealized frame.

High current implementation of Cu/P-type GaN triboelectric nanogenerator

Traditional surface engineering, as a means of manufacturing triboelectric nanogenerator (TENG), is complex and expensive. The yield of traditional polymer process is low, which leads to the high cost and low stability of traditional TENGs and greatly limits their practical applications. Moreover, it is worth noting that with the miniaturization and integration of electronic devices, generators need to provide higher current in parallel circuits. In this study, we report the performance of the enhanced Cu/P-type GaN TENG contacts in centimeter scale. Considering the high surface mechanical strength and surface structure characteristics of GaN wafers, we propose using molten KOH to etch the Ga polar GaN surface to form more interface electrons and dangling bonds without destroying the surface structure. Our experimental results show that the generator performance has been drastically improved (the short circuit current increases from 9 to 80 μA, and the open circuit voltage increases from 8 to 29 V). The maximum load electric power density of ∼0.28 W/m2 was obtained. We also compared the open circuit current density with the reported different type TENGs based on Schottky contact at the centimeter-level. The Cu/P-type GaN TENGs achieved in this work exhibit excellent open circuit current density of ∼36 μA/cm2. Thus, we provide insight into surface engineering for future generation TENG devices.

Structure and Properties of Black Ceramic MAO Coatings on Aluminum Alloys

The existing processes for obtaining black wear-resistant coatings include chemical methods, anodic oxidation followed by painting in aniline dyes, electrochemical deposition, vacuum plasma treatment, microarc oxidation (MAO). Of great interest for the formation of light-absorbing coatings is the MAO method, which is characterized as a reliable and environmentally friendly process, which provides the formation of a hard ceramic-like oxide layer with high corrosion resistance аnd good adhesion to the substrate. Therefore, the development of methods for obtaining high-quality black MAO coatings with both high optical and mechanical characteristics is currently an urgent task. The paper presents the results of a study of the structure and properties of black ceramic coatings on aluminum alloy AMg2 obtained by microarc oxidation using silicate-alkaline and silicate-phosphate electrolytes containing potassium ferrocyanide and sodium tungstate as coloring components. Sodium tungsten acid and potassium ferrocyanide with a concentration of 0.5 to 2.0 g/l were added to the electrolytes as additional components that ensured the coloring of the coatings. It has been established that the most saturated black coatings in a silicate-alkaline electrolyte are formed with the addition of 1.5–2.0 g/l of sodium tungstate, and in a silicate-phosphate electrolyte with the addition of 1.5 g/l of potassium ferrocyanide. The use of an electrolyte containing sodium tungstate makes it possible to form coatings with a lower microroughness height (Ra 0.97–1.11 µm) compared to coatings obtained in an electrolyte containing potassium ferrocyanide (Ra up to 4.20 µm). The maximum wear resistance of the resulting coatings (wear rate (0.38–0.59) × 10–4 mm3/(m×N)) is achieved by treatment in the studied electrolytes with a duration of 10 min. In this case, the thickness of the coatings is 21–31 µm. A further increase in the duration of processing does not have a significant effect on the wear rate.