Abstract The inhibition efficiency of Ethyl 1-(4-chlorophenyl)-5-methyl-1H-1,2,3-triazole-4-carboxylate (ETC) on AA6061 Aluminium (Al) alloy in 0.1M HCl solution was tested through weight loss, potentiodynamic polarisation and electrochemical impedance spectroscopy methods. The experimental results show that the inhibition efficiency of ETC increased with an increase in inhibitors concentration and

Abstract The cathodic plasma electrolytic deposition (CPED) was performed in alkaline electrolyte (glycerol + sodium nitrite) to form a nitrocarburized layer on AISI 1045 steel at constant voltage of 380 V. The results indicated that nitrocarburized layer was mainly comprised of ε–Fe2–3N, γ'–Fe4N, Fe3C and Fe [Fe(CN)6]3 phases. As the treatment time was prolonged from 5 to 15 min, the surface porosity

Abstract The influence of organic molecule based from Epoxy Resin Octa-functional (REO) on the corrosion inhibition of mild steel in the presence of 0.5 M H2SO4 at different temperatures have been studied using polarization, EIS and computational methods. Polarization curves indicate that REO is a mixed inhibitor. EIS measurements show an increase of the transfer resistance with increasing inhibitor

Abstract— Electro-spark deposition (ESD) or low energy welding (LEW) technique allows the coating of metallic materials with different metal and alloys, conductive ceramics and conductive ceramic metal composites. It is also known as micro-joining process to improve the wear properties of the substrate or to obtain a more durable upper superficial coating. In this study, the surfaces of AISI 1040,

Abstract Deposition of chromium nitride (CrN) thin films on Si(100) and low carbon steel (LCS) substrates has been performed using DC magnetron sputtering technique at different values of power from 100 to 150 W. A methodical study of the influence of power on structural and physical properties of the thin films was effected out. Films structure have been investigated by X-ray Diffraction (XRD) and

In this study, the inhibitive performance of 2-mercaptobenzothiazole (2MBT) and 2-aminobenzothiazole (2ABT) were investigated on API-5L X60 steel as corrosion inhibitor in NaCl 3.5 wt % solution saturated with CO2 at 25, 40 and 60°C. The 2ABT compound due to the formation of bicarbonate salt and carbamate does not have good performance as a corrosion inhibitor. Adsorption/desorption effect of 2-mercaptobenzothiazole

Abstract A corrosion study of high purity magnesium in two simulated physiological solutions (Ringer’s solution and Hank’s solution) is reported. The electrochemical behavior of pure magnesium rotating disc electrode (RDE) was examined using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) techniques. The rotation affects the potentiodynamic polarisation curves and

Abstract In this research, the inhibitive performance of locust bean gum (LBG) on the corrosion behavior of AISI 304 stainless steel (AISI 304SS), E150 Al alloy and copper in 0.15 M NaCl containing various amounts (10–3, 10–2, 10–1, 1, 1.5 and 2 g L–1) of LBG were researched using potentiodynamic polarisation, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), energy

Abstract In this study corrosion resistance and adhesion properties of two types of phenolic coatings, novolac and resol, have been investigated. Phenolic coatings containing clay particles were prepared and the effect of clay content on the corrosion protection performance of the coatings was evaluated by electrochemical impedance spectroscopy (EIS), DC polarization and salt fog tests. On the other

Abstract The effect of pH value on the electroless deposition of copper coated graphite powders (Cu@GPs) was investigated in this paper. The cathodic and anodic polarization curves were determined by linear sweep voltammetry in the plating at various pH value. pH value increasing can reduce the initial oxidation potential of formaldehyde, increase peak current density and accelerate electroless copper

Abstract The effect of the alkaloid extract of Taxus baccata (AETB) as a green inhibitor of carbon steel in 1M HCl solution, were assessed. It was found that the inhibition efficiency increased with the extract concentration and decreased with rising of temperature. The polarization curves revealed that the (AETB) acted as mixed type inhibitor. The extract was physisorbed on steel surface and obeys

Abstract The anti-corrosive Zn and Zn–Ni alloy coatings were electrodeposited on different copper substrates using an optimized sulphate electrolyte bath by conventional Hull cell method with glycine as an additive. The composition and surface morphology of the coatings were dependent on the current density. The co-deposition of Zn and Ni in Zn–Ni alloy showed anomalous behaviour, wherein, the deposition

A solution has been developed for deposition of cerium-containing coatings on an alloy steel base that meets the requirements for protective coatings. It is established that the protective coating on alloyed steel consists of cerium oxides Ce2O3 and CeG2, iron oxide Fe2O3, and chromium oxide Cr2O3. Passivation of stainless steel in a cerium-containing solution has been shown to significantly increase

Abstract—In this paper, chromate-free conversion coatings on aluminum alloys D16 and AMg3 are studied in a tropical marine climate. It has been shown that the conversion coating IFKhANAL-3 independently provides corrosion protection for aluminum alloy AMg3 for 9 months, and for alloy D16, for 6 months. Additional treatment with acrylate or PTFE varnishes makes it possible to increase this to 12 months

Abstract The paper presents the results of a study of the corrosion-electrochemical behavior of coatings based on the metastable phase of tungsten β-W obtained by chemical vapor deposition from fluorine-containing media in a neutral medium. It is shown that the corrosion nature of coatings based on β-W is fundamentally similar to that of the coatings based on α-W, but the β-W based coatings, due to

The plasma electrolytic oxidation of the titanium alloy OT4 was studied; the characteristics of the resulting coatings were determined–thickness, breakdown potential, corrosion current density, and X-ray phase; micro-X-ray spectral analysis was performed, and the morphology of the coatings was studied by scanning electron microscopy. We studied the effect of plasma electrolytic oxidation of OT4 and

Abstract— The chronoamperometry method was used to study corrosion of the aluminum alloy AD31 in the presence of potassium permanganate in chloride-containing acidic media. A rotating disk electrode was used to establish the kinetic features, and the mechanisms of cathodic oxygen reduction on AD31 in permanganate-containing acidic solutions were proposed.

Abstract The results of a study of the effect of aluminide coatings of the NiCrAlY and Al(Si) systems on intermetallic heat-resistant titanium alloys VIT1 based on Ti2NbAl orthophase or TNM-B1 based on γ-TiAl on the resistance to isothermal oxidation are presented. The structures, phase, and chemical composition of the coatings after annealing and after high-temperature oxidation at temperatures of

Abstract Using a set of physicochemical (ellipsometry and contact angle measurements), electrochemical (potentiometric anode polarization and electrochemical impedance spectroscopy), and corrosion (periodic moisture condensation test) methods, the properties of adsorption films formed on the AMg6 aluminum alloy surface by the chamber method in vapors of some amines of heterocyclic compounds, carboxylic

Abstract Using a set of physicochemical (ellipsometry and contact angle measurements), electrochemical (electrochemical impedance spectroscopy and polarization measurements), and corrosion (periodic moisture condensation and salt fog tests) methods, the properties of adsorption films formed on copper by the chamber method from vapors of benzotriazol (BTA), 1H-1,2,4-triazole, tolyltriazole (TTA), 5-chloro-1

Abstract The method of electrochemical impedance spectroscopy was used to study the adsorption of an IFKhAN-92 inhibitor, 3-substituted 1,2,4-triazole, on low-carbon steel from 2.0 M H2SO4 (22°C). It was shown that the Temkin isotherm with a relatively high value of free energy of adsorption (−ΔGads) = 49 kJ/mol described its adsorption. It was suggested that the inhibitor adsorption has a chemisorption

Abstract The adsorption and protective properties of three thiadiazole derivatives on St3 steel from 5 and 15% H2SO4 solutions have been studied by the method of impedance spectroscopy. A series of changes in absorbability and protective effect depending on the compound structure have been determined. Equivalent electrical circuits have been suggested, and numerical values of circuit parameters have

Abstract The process of local corrosion of the aluminum surface in solutions of 0.1 M NaCl (pH 10–11.4) was studied. Data on the rates of local partial processes were obtained based on processing a series of images using computer vision methods. It is shown that the places of localization of defects are determined at the very beginning of the process and their location can be estimated in the first

Abstract— A by-product of oxygen biotransformation during the life of bacteria is the superoxide ion \({\text{O}}_{2}^{ - }\), which quite easily, including nonenzymatically, can turn into the stable product H2O2, which, as is well known, may exhibit corrosive properties for metals. Thus, the vital products of bacterial can act on a metal not only as chemical agents, they can also electrochemically

It is shown that the multimolecular protective layer of an organic inhibitor formed on the surface of chromium–nickel steel in an HCl solution containing a triazole derivative, the inhibitor IFKhAN-92, has a protective aftereffect in background solutions of the same acid. Such a protective layer is chemically bonded to the Fe, Cr, and Ni oxide and hydroxide phase adjacent to the metal phase. The lower

The possibilities of protecting the aluminum alloy D16 with organic corrosion inhibitors are considered. The protective ability of the obtained nanoscale layers was evaluated by an express method (drop test), tests in a heat and moisture chamber, salt spraying, and electrochemical impedance spectroscopy. The efficiency of treating D16 in aqueous solutions of organic inhibitors is correlated with the

Abstract Alternating current accelerates stress corrosion cracking of grade X70 pipe steel in electrolytes of various compositions: 3.5% NaCl solution (pH 7), citrate buffer (pH 5.5), and a mixture of NS4 solution with borate buffer (pH 7). The increase in crack growth rate upon static load and deterioration of steel crack resistance during constant extension rate testing correlate with an increase

Abstract To predict \(K_{1}^{{{\text{pr}}}}\) values, the dose-response functions (DRFs) presented in the ISO 9223:2012(E) standard were used, both new and universal ones. This work is based on experimental data of the corrosion losses of St3, Zn, Cu, and Al for the first year of exposure (\(K_{1}^{{\exp }}\)) and calculated by the DRF values ​​of corrosion losses for the first year (\(K_{1}^{{{\text{pr}}}}\))

Abstract—It is known that lithium-containing aluminum alloys possess low pitting corrosion resistance. It has been previously shown that an IFKhANAL-3 alkaline chromate-free conversion composition gives the coatings on a series of aluminum alloys, such as AMg3, D-16, and V95, which are comparable to conventional chromate coatings in terms of protective properties. It should also be noted that inhomogeneous

Abstract Composite electrochemical coatings (CECs) based on zinc, modified with carbon nanotubes (CNTs) from an alkaline electrolyte in a pulsed electrolysis mode have been obtained. The microstructure and tribological properties of these CECs are investigated. It was found that the introduction of the dispersed CNT phase into the alkaline galvanizing electrolyte reduces the sliding friction coefficient

Abstract It was shown that the physical and/or chemical interactions of the polymer matrix and the nanofiller surface are determined by two factors: the degree of polymer adsorption by the nanofiller and its surface structure. The introduction of a binding agent enhances these interactions and increases the level of interfacial adhesion. If structural factors and physical and/or chemical interactions

Abstract A thermodynamic estimation of the Rebinder effect is analytically constructed upon adsorption of sulfonol from an aqueous solution on a flat surface of limestone. For the constructed function for evaluating the effect (increment of surface tension), conditions for its dome-shaped shape are obtained depending on the volume concentration of sulfonol. Comparison of the experimental curve of the

Abstract The distribution of the density of the adsorbate inside the transition region of the liquid–vapor interface in a slit pore, in which the density of the substance varies both along the pore width and along the transition region between the vapor and the liquid, has been investigated. Equilibrium molecular distributions at the phase boundary are described in the framework of the discrete-continuum

Abstract The effect of magnetic activation on the surface characteristics of clinoptilolite, such as particle size, surface area, pore size, and distribution, were determined. Magnetic activation was performed in an ultrahigh frequency electromagnetic field (UHF EMF) and a weak pulsed magnetic field (WPMF). A significant effect of magnetic activation was detected: particle aggregation during treatment

Abstract Using the method of diffusion enrichment with a nonsolvent of polymer solutions in mixed solvents, porous structures are obtained and their structural characteristics are determined. Quasi-binary state diagrams of two four-component systems were obtained. Viscosities of polymer solutions in mixed solvents were measured. The dependences of the reduced viscosity on the polymer concentration

Abstract— A one-step notion of synthesis was developed to prepare microporous activated carbons from walnut shell by physical gas activation in a CO2 atmosphere for a low-temperature methane accumulation system operating at 120, 160, and 178 K. The raw material was carbonized within a temperature range from 240 to 950°C. Temperatures close to 900°С were found to be optimal for the development of microporosity

Abstract This work is devoted to the deposition of Cr3C2 chromium carbide powder on steel 35 by electrospark treatment in titanium granules. Three mixtures of granules containing Cr3C2 powder were prepared from 7.4 to 15.6 vol %. X-ray phase analysis of coatings showed the predominance of the Cr7C3 phase, which is the product of the decarbidation of Cr3C2 chromium carbide when it interacts with the

Abstract The synthesis of a carbon sorbent modified with lactic and glycolic acids using a vacuum rotary evaporator was carried out. The parameters of the process of modification of the carbon sorbent are optimized: the duration of synthesis, the temperature of polycondensation, and the consumption of the modifier. The physicochemical properties of the original and modified sorbents were studied before

Abstract Coatings based on transition metal borides (Ti, Mo, Cr, Zr) were obtained by magnetron sputtering of ceramic targets in Ar and Ar–15% N2 gaseous media. Resistance of coatings to cyclic impact loading against WC–6%Co ball was estimated at a load of 1 kN for 105 cycles using a CemeCon impact tester. The analysis of the relationship between the structure characteristics, chemical composition

Abstract The reasons for the expansion of the temperature range of inelasticity of a polymer material at temperatures above the glass transition temperature when it is filled with zinc powder, studied using the method of dynamic mechanical relaxation spectroscopy, are analyzed. In the internal friction spectra of the filled polymer, a decrease in the intensity of α-relaxation processes in the region

Abstract— A Zr–BDC metal–organic framework was synthesized by the solvothermal method using N,N‑dimethylformamide as an organic solvent at the temperature 110°С. The adsorbent thus obtained is characterized by a developed porous structure with specific BET surface SBET = 1060 m2/g, micropore volume W0 = 0.44 cm3/g, and average micropore radius х0 = 0.54 nm, which is indicative of a potentially effective

Abstract In the present work, we have proposed a method for estimating the roughness coefficient of films based on organosols of silver nanoparticles under conditions of homogeneous and heterogeneous wetting using the method for determining contact angles. Concentrated organosols of silver nanoparticles stabilized with a nonionic surfactant sorbitan monooleate have been used as initial systems. Films

Abstract It has been confirmed in the present work that the components of an electrolyte and impregnating solution accumulated in pores can serve as a material for the microcrystal formation on the surface of oxide layers at high-temperature oxidative annealing. WO3 microcrystals were formed in the pores and along the pore perimeter of coatings formed by the method of plasma-electrolytic oxidation

Abstract Due to the need to develop technologies for nonregenerative adsorptive separation of ethane, propane, and butane from mixtures (1–5%) with natural gas, the molecular dynamics method was used to calculate the dependence of the adsorbed amounts and separation coefficients of the components of binary mixtures of methane with ethane, propane, and butane on the composition of mixtures, temperature

Abstract The morphology and composition of metal–oxide coronaparticles after the thermal oxidation of iron particles within the temperature range of 25–600°C under atmospheric conditions were investigated by in situ Raman-scattering spectroscopy. Thermal treatment at 100–300°C results in the predominant formation of a Fe3O4 and γ-Fe2O3 mixture, with a small amount of α-Fe2O3, on the surface of the

Abstract The interaction of thin Ti–B–N films obtained by magnetron reactive sputtering of a TiB2 target was studied in an atmosphere of a gas argon–nitrogen mixture (85 vol % Ar + 15 vol % N2), with mineral acids (HCl, H2SO4, H3PO4, HNO3). It was found that the hexagonal boron nitride formed during the deposition process, along with titanium nitride, forms a resistant protective film that protects

Abstract Based on a numerical experiment, it is proven that the Dubinin theory of micropore filling can be extended to adsorption equilibria at supercritical temperatures. The temperature dependences of the main parameters of the theory are refined.

Abstract Synthesized new organosilicon derivatives of dithizone with high sorption activity and nonselective metalchromic properties. The possibility of increasing the selectivity of the metalchromic effect and the prospects for their use as test systems are shown.

Abstract As an addition to previously obtained data, it has been shown that the adsorption isotherms calculated by the molecular dynamics method for components of light hydrocarbon mixtures in micropores of active carbons and on graphene surfaces are quantitatively described by equations of lattice models with well-coordinated equation parameters.

Abstract The Al2O3 powder was added as a filler to polyurea and the effect of doping amount on Shore hardness and wetting property were investigated. The electrochemical impedance spectroscopy (EIS) was used to investigate the corrosion resistance of coating/aluminum alloy system in 0.1 mol/L NaOH solution. The results showed that with the increase of the doping amount, the Shore hardness of the coating

Abstract The effect of adding 5 and 10% of TiB2 on the corrosion of Udimet 700 (U700) in 1 M HCl including altered concentrations of organic compounds was considered at 25°C by electrochemical methods: potentiodynamic polarization (PP), electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) methods. Microstructure characterization of these alloys was studied by

Abstract Powdered mixtures of aluminum with 20 wt % of organic components were subjected to plastic deformation under a pressure of 0.5–4.0 GPa on an anvil-type high-pressure apparatus and then investigated by thermogravimetry and DSC. In deformed mixtures in the T-range of 30–500°C, there was a decrease in mass associated with the decomposition of organic components, while there was an increase in

Abstract In this study, a mixture of 93% Ni–7% Mg and 97% Ni–3% Mg powders were produced by the TM method and the diffusion kinetics, surface properties of borided nickel–magnesium alloy at different temperatures and times were investigated. The samples were sintered at 530°C. The boriding process was performed Ekabor II boron powder in atmospheric furnace environment at 900, 950 and 1000°C temperatures

Abstract The thermodynamic, inhibitive and synergistic properties of Fragaria ananassa (strawberry) and Cucurbita pepo L (zucchini) leaf extracts on the corrosion of mild steel in Hydrochloric acid solutions were examined by potentiodynamic polarization curves measurements and electrochemical impedance spectroscopy (EIS) technique as well as optical photographic study. Fourier transform infrared spectroscopy

Abstract Adsorption isotherms of methane on AUK, АU-1, and Р-300 active carbons, which possess completely different structural-energy characteristics at the temperatures of 120, 160, and 180 K and pressures of up to 6 bar, as well as the dependences of the specific amount of accumulated methane on these adsorbents on pressure, have been calculated based on the Dubinin’s theory of volumetric filling

Abstract A new class of corrosion inhibitors, namely, pyridine-2,6-diamine (PD) , pyrimidin-2-amine (PA), 6-amino-3,4-dihydropyrimidine-2(1H)-thione (ADT) and ethyl (R)-6-(4-chlorophenyl)-2-mercapto-4-methyl-1,6-dihydropyrimidine-5-carboxylate (EMMD) has been used. The influence of these pyridine-pyrimidine on the dissolution of aluminum in molar HCl has been investigated using impedance spectroscopy

Abstract The method of magnetron sputtering of a ZrB2–20% Si target was used to obtain coatings on substrates of molybdenum, chromium, and hard alloy. The composition, structure and tribological properties of the coatings have been studied. The influence of physical and mechanical properties of substrates on the behavior of coatings under friction sliding and impact of impact dynamic loading is established

Abstract An approach to calculating the surface energy and the surface tension in solid–vapor systems of binary solid solutions with different degrees of ordering is developed based on the lattice gas model (LGM). The LGM is the only procedure allowing a uniformly accurate description of the properties of phases and transition regions between the coexisting equilibrium phases. The model is targeted

Abstract The results of a study of the adsorption of zinc(II) and chromium(III) ions by zeolites modified by HCl are presented. According to the data of elemental analysis and electron spectroscopy, the zeolites contain at least 75% heulandite in their composition. The removal of aluminum ions from the tetrahedral framework of the sorbent formed by AlO4 and SiO4 occurs upon modifying the zeolites by

Abstract The role of Echium angustifolium Mill extract for advancing corrosion resistance of carbon steel in 1.0 M H2SO4 solution was discussed in this research. Weight loss (WL), open circuit potential (OCP), potentiodynamic polarization (PP) and electrochemical impedance spectroscopy (EIS) methods were applied to monitor the corrosion behavior of carbon steel in 1.0 M H2SO4 solution. The influence