Protection of Metals and Physical Chemistry of Surfaces最新文献

{"title":"Corrosion of Centrifuged Hot Dip Galvanized Pad Hooks Used in GFRC Panels","authors":"Husnu Gerengi,&nbsp;Muhammed Maraşlı,&nbsp;Moses M. Solomon,&nbsp;Kader Coskun,&nbsp;Yusuf Guner","doi":"10.1134/S2070205124702459","DOIUrl":"10.1134/S2070205124702459","url":null,"abstract":"<p>Anchor elements and pad hooks are necessary components for securing GFRC panels to the main building structure, but they are vulnerable to corrosion when exposed to the atmosphere. This study evaluated the corrosion resistance of two centrifuged hot-dip pad hooks (designated A1 and B1) in a 5% (w/v) NaCl solution. The samples were subjected to a 20-day salt spray test and observed visually and through SEM-EDX for elemental composition. The thickness of the surface coating was measured before and after the salt spray test. The visual observation and SEM images indicate that the pad hook samples remained corrosion-free in the studied environment as the brownish iron oxides were not observed. The surface products were mainly Zn-rich corrosion products. The average thickness of samples A1 and B1 before the corrosion test was found to be 78.15 and 145.65 µm. After the corrosion test, the thickness increased to 100.98 and 191.74 µm for samples A1 and B1, respectively. The EDX results, however, revealed that both samples were corroded when exposed to the corrosive medium but B1 had a superior resistance than A1. It is therefore recommended to improve the production processes to focus on surface pre-treatment and Zn coating thickness for improved corrosion resistance.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 6","pages":"1113 - 1119"},"PeriodicalIF":1.1,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On the Use of Positron Flaw Detection in Monitoring the Atomic-Electronic and Defect Structure of Deformed Metal Mixtures","authors":"I. I. Bardyshev,&nbsp;V. A. Kotenev","doi":"10.1134/S2070205124702575","DOIUrl":"10.1134/S2070205124702575","url":null,"abstract":"<p>This article considers methodological issues of applying positron annihilation (PA) spectroscopy in monitoring the atomic-electronic and defect structure of deformed metallic mixtures. This method, like many other complex methods for determining the atomic-electronic structure, structure and characteristics of defects, requires specialists not only to carry out the measurements themselves, but also to analyze the initial experimental data. On the other hand, to understand the results of annihilation spectroscopy and their significance in terms of material properties, no special training is required, except for several basic concepts that are presented in this paper. This paper describes the method using the example of studying the atomic-electronic properties of heavily deformed mixtures of aluminum and copper powders. It is shown that the positron annihilation method is extremely sensitive to the vacancy composition of deformed powders associated with their chemical activity.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 6","pages":"1167 - 1172"},"PeriodicalIF":1.1,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Adsorption of Ethane (С2Н6) onto a La–BTC Microporous Metal–Organic Framework Structure at High Pressures","authors":"A. A. Pribylov,&nbsp;A. E. Grinchenko,&nbsp;A. A. Fomkin,&nbsp;A. V. Shkolin,&nbsp;I. E. Men’shchikov","doi":"10.1134/S2070205124702630","DOIUrl":"10.1134/S2070205124702630","url":null,"abstract":"<p>The absolute adsorption of ethane onto a La–BTC metal–organic framework (MOF) structure, which was prepared using such a rare metal as lanthanum, was examined within a pressure range of 0.1–4 MPa at temperatures of 303.0, 313.0, 323.0, and 333.0 K. As follows from the experimental data on the adsorption of С₂Н₆ onto a La–BTC MOF obtained in the present study<i>,</i> the adsorption isotherms are reversible, and the amount of adsorbed molecules increased with pressure and decreased with rising temperature. The isosteres of adsorption plotted in coordinates ln<i>P = f</i>(1/<i>T</i>) at constant adsorption values are well described by linear functions at all pore fillings. The dependences of isosteric differential molar heats of ethane adsorption onto a La–BTC MOF on the value of adsorption were calculated for the studied range of temperatures. It was shown that the La–BTC MOF is a microporous adsorbent and can be employed for extracting ethane from natural gas.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 6","pages":"1077 - 1083"},"PeriodicalIF":1.1,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Relaxation Behavior of Latex Acrylate Polymers. 2. The Interrelationship between Physicochemical and Physicomechanical Properties of Polymers","authors":"T. R. Aslamazova,&nbsp;V. A. Kotenev,&nbsp;V. A. Lomovskoi","doi":"10.1134/S2070205124702563","DOIUrl":"10.1134/S2070205124702563","url":null,"abstract":"<p>The review is devoted to the generalization of results of research on the relaxation behavior of latex acrylic resins polymers used as a binder in composite coatings on surfaces of various chemical nature, structure, and composition with the aim of identifying the temperature regions of realization of their elastic and inelastic (dissipative) properties at temperatures from –150 to +200°C established using the method of dynamic relaxation spectroscopy. In the second section, an analysis of experimental data on the spectra of internal friction and temperature–frequency dependences of the oscillatory process of latex polyacrylates was carried out to demonstrate the relationship between their physicochemical and physicomechanical properties of the polymer.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 6","pages":"1147 - 1166"},"PeriodicalIF":1.1,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigating the Treatment of Transition Metals for Ameliorating the Ability of Boron Nitride for Gas Sensing & Removing: A Molecular Characterization by DFT Framework","authors":"Fatemeh Mollaamin","doi":"10.1134/S2070205124702502","DOIUrl":"10.1134/S2070205124702502","url":null,"abstract":"<p>The electronic, magnetic and thermodynamic properties of adsorption of toxic gases including NO molecules by using transition metals of <i>X</i> (<i>X</i> = Sc, V, Cr, Co, Cu, Zn)-doped boron nitride nanocage (B₅N₁₀_NC) have been investigated using density functional theory. The results denote that NO@<i>X</i>–B₄N₁₀_NC are stable compounds, with the most stable adsorption site being the center of the cage ring. The partial density of states (PDOS) can evaluate a determined charge assembly between gas molecules and <i>X</i>–B₄N₁₀_NC which indicates the competition among dominant complexes of Sc, V, Cr, Co, Cu, Zn. Based on NQR analysis, <i>X</i>-doped on B₅N₁₀_NC has shown the lowest fluctuation in electric potential and the highest negative atomic charge including 0.3710 C (copper), 0.5970 C (chromium), 0.7392 C (vanadium), 0.7768 C (zinc) and 0.8259 C (scandium), respectively, have presented the most tendency for being the electron acceptors. Furthermore, the reported results of NMR spectroscopy have exhibited that the yield of electron accepting for doping atoms on the <i>X</i>–B₄N₁₀_NC through gas molecules adsorption can be ordered as: Co ≈ Cr &gt; Cu &gt; Zn &gt; V ≈ SC that exhibits the strength of covalent bond between scandium, vanadium, chromium, cobalt, copper, zinc and NO towards toxic gas removal from air. In fact, the adsorption of NO gas molecules can introduce spin polarization on the <i>X</i>–B₄N₁₀_NC which specifies that these surfaces may be employed as magnetic scavenging surface as a gas detector. Regarding IR spectroscopy, doped nanocages of Sc–B₄N₁₀_NC, V–B₄N₁₀_NC, Cr–B₄N₁₀_NC, Co–B₄N₁₀_NC, Cu–B₄N₁₀_NC and Zn–B₄N₁₀_NC, respectively, have the most fluctuations and the highest adsorption tendency for gas molecules which can address specific questions on the individual effect of charge carriers (gas molecule-nanocage), as well as doping atoms on the overall structure. Based on the results of <span>(Delta G_{{text{R}}}^{^circ })</span> amounts in this research, the maximum efficiency of Sc, V, Cr, Co, Cu, Zn atoms doping of B₅N₁₀_NC for gas molecules adsorption depends on the covalent bond between NO molecules and <i>X</i>–B₄N₁₀_NC as a potent sensor for air pollution removal. Finally, high selectivity of atom-doped on boron nitride nanocage (gas sensor) for gas molecules adsorption has been resulted as: Cu <span>( gg )</span> Co &gt; Cr &gt; V &gt; Zn &gt; Sc.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 6","pages":"1050 - 1063"},"PeriodicalIF":1.1,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of Prior Chemical Treatment in a Nitric Acid, and a Weak Perpendicular to the Surface Heterogeneous Magnetic Field on the Corrosion behavior of AISI 316L Austenitic Stainless Steel, Intended for Use as an Implant, in Chloride Solution","authors":"Djedjiga Ben Abdesselam,&nbsp;Nacer Zazi,&nbsp;Fatah Hellal,&nbsp;Mărioara Abrudeanu,&nbsp;Denis Negrea,&nbsp;Jean Paul Chopart","doi":"10.1134/S2070205124702435","DOIUrl":"10.1134/S2070205124702435","url":null,"abstract":"<p>Prior chemical treatment in an aerated 65 wt % nitric acid solution (PCTNA), and weak permanent heterogeneous magnetic fields perpendicular to the surface WPHMFP effects on corrosion behavior of AISI 316L alloy in immersion in 0.9 wt % NaCl containing 0.1wt % glucose solution, proposed to use as an implant, have been studied. A PCTNA coupled with reduces localized corrosion during the immersion in a chloride solution. A PCTNA induces the formation of Al₂O₃ and SiO₂ oxides on the surface in absence of magnetic field and Al₂O₃ containing nitrogen in presence of WPHMFP. The corrosion in the presence WPHMFP during the rest potential and current–potential test increases the rest potential, and cancels the electrochemical noise (EN) on the rest potential curve during the first 4 h of immersion in nitric acid solution, withdraws the EN in anodic domain of polarization curves, remove the intergranular corrosion observed after polarization test following the first hour of immersion, and reduces the localized corrosion. The WPHMFP effects are almost removed after 3 days of immersion in nitric acid solution. The corrosion in chloride solution, after chemical treatment in the presence or in the absence of magnetic field, and the corrosion in a chloride solution in presence of magnetic field and without prior chemical treatment induce AgCl deposition on the surface of AISI 316L alloy after its dissolution from the Ag/AgCl reference electrode.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 6","pages":"1183 - 1199"},"PeriodicalIF":1.1,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simulation of the Cyclic Adsorption–Desorption Processes in an Adsorbed Natural Gas Storage System Loaded by a Peat-Derived Nanoporous Carbon Adsorbent","authors":"I. D. Shelyakin,&nbsp;I. E. Men’shchikov,&nbsp;A. V. Shkolin,&nbsp;S. S. Chugaev,&nbsp;A. E. Grinchenko,&nbsp;A. V. Shapagin,&nbsp;E. V. Khozina,&nbsp;A. A. Fomkin","doi":"10.1134/S2070205124702290","DOIUrl":"10.1134/S2070205124702290","url":null,"abstract":"<p>Practical vehicular application of the adsorbed natural gas (ANG) storage technique depends on the selection of an accessible adsorbent with required properties and the development of optimal charge–discharge conditions that ensure the maximum efficiency and vehicle tank mileage. In the present study, we carried out the simulation of the charge–discharge of a full-size ANG vessel with a volume of 65 and 150 L employing a carbon adsorbent under conditions with and without using forced thermal control (TC) for different gas flow rates of charge ranging from 5 to 5000 L min^–1. A lumped-parameter model of the charge–discharge of the ANG system used the experimental methane adsorption data, including adsorption-induced deformation and heat effects on the commercial peat-derived carbon adsorbent PAC-3 measured over a temperature range of 213 to 393 K. According to the X-ray diffraction and scanning electron microscopy data, PAC-3 possessed the heterogeneous morphology and diverse chemical composition inherited from the precursor and activation conditions. The analysis of low-temperature nitrogen adsorption revealed its predominantly microporous structure with a small proportion of mesopores. The dilatometric measurements observed the methane adsorption-induced changes in the linear and volumetric dimensions of PAC-3 granules with a maximum magnitude of 0.62 and 1.85%, respectively, which should be taken into account in order to maintain the integrity of the ANG vessel as well as to accurately assess the temperature fluctuations arising during the charge–discharge processes. The simulations revealed that the use of TC facilities in the ANG system prevented the strong heating of the adsorbent, improved the deliverable capacity, and increased the vehicle tank mileage. The advantages of using TC in the ANG systems are most obvious at low gas flow rates (5 to 80 L min^–1), high pressures, and large volumes of the vessel.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 5","pages":"807 - 826"},"PeriodicalIF":1.1,"publicationDate":"2025-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143581073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Relaxation Behavior of Latex Acrylate Polymers. 1. The Effect of Polymerization Factors. 1.2. Statistical and Seed Polymers","authors":"T. R. Aslamazova,&nbsp;V. A. Kotenev,&nbsp;V. A. Lomovskoi","doi":"10.1134/S2070205124702332","DOIUrl":"10.1134/S2070205124702332","url":null,"abstract":"<p>Chemical structures and relaxation behavior of polyacrylates synthesized using statistical and seed emulsion copolymerization methods were compared, taking into account their relaxation behavior in the glass-transition temperature range and at negative temperatures in the range from –150 to 0°C. To clarify the difference in the relaxation structures of both polymers, the effect of a water-soluble modifier on the main and local dissipative processes is considered. The relaxation microuniformity of the statistical and seed polymers is determined, taking into account also the effect of the modifier on the spectrum of internal friction of latex polymers of various polymerization structures. A theoretical approach to the assessment of the relaxation microuniformity of latex polymers is proposed based on the choice of a function for describing the dissipative processes occurring in latex polymers and its correlation with experimental data.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 5","pages":"866 - 881"},"PeriodicalIF":1.1,"publicationDate":"2025-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143581219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Surface and Interfacial Tension of Two-Component Two-Phase Separating Systems of Cubic Shape","authors":"E. S. Zaitseva,&nbsp;Yu. K. Tovbin","doi":"10.1134/S2070205124702356","DOIUrl":"10.1134/S2070205124702356","url":null,"abstract":"<p>A numerical analysis of the thermodynamic determination of the surface tension (ST) between a fluid and a solid of a binary mixture and the interfacial tension (IT) between two dense phases as an excess value of free energy is carried out Δ<i>F</i> two-phase system with and without taking into account the presence of a phase boundary. Stratification is considered for cubic condensates, which were previously discussed in thermodynamic approaches. A microscopic analysis is given of the generalization of the Gibbs thermodynamic approach, introducing surface tension on the mathematical interface, to the case of a complex boundary shape with the introduction of local surface tensions for faces, edges, and vertices of faces. Depending on the type of averaging of local inhomogeneous regions, two forms of layered dividing surfaces are constructed: with straight and smoothed angles. The calculation was carried out in the simplest version of the lattice gas model (LGM) taking into account the interaction of nearest neighbors in the quasi-chemical approximation on a rigid lattice. Each node of a two-component mixture in the LGM system can be occupied by the components of the mixture A + B and vacancy V. Two main methods of calculating ST and IT, which are expressed through different partial contributions of <span>(M_{f}^{i})</span> into excess free energy Δ<i>F</i> (here, <i>i =</i> A, B, V are vacancies and 1 ≤ <i>f</i> ≤ <i>t</i>, where <i>t</i> is the number of different types of nodes, depending on the position of the node inside the corner regions of the cube), are compared. An ambiguity of the values of ST and IT depending on the type of functions <span>(M_{f}^{i})</span> is obtained when calculating the dependence of ST and IT on the domain size at a fixed temperature. The role of vacancies as the main mechanical characteristic of a two-component mixture in the LGM under the condition of strict phase equilibrium according to three partial equilibria (mechanical, thermal, and chemical) is discussed. It is shown that, if calculations of the IT are carried out for two dense stratified phases without taking into account vacancies, this distorts the real value of the IT.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 5","pages":"891 - 905"},"PeriodicalIF":1.1,"publicationDate":"2025-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143581221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electrophilic Substitution in Alkenes by the Example of Bromination of Vinylporphyrins","authors":"V. S. Tyurin,&nbsp;A. O. Shkirdova,&nbsp;I. A. Zamilatskov","doi":"10.1134/S2070205124702393","DOIUrl":"10.1134/S2070205124702393","url":null,"abstract":"<p>The bromination of a carbon–carbon double bond is a classic reaction, the mechanism of which has been thoroughly studied for a long time. However, it has been found that the behavior of certain porphyrin substrates does not follow generally accepted concepts. Instead of bromine addition to the double bond, these substrates undergo substitution of a hydrogen atom by a bromine atom. Using the methods of low-temperature NMR spectroscopy and quantum chemical calculations, the mechanism of the bromination reaction of vinylporphyrins has been established. It has been demonstrated that the influence of a porphyrin substituent on the double bond leads to a change in the mechanism from electrophilic addition Ad_E, which is typical for alkenes, to electrophilic substitution S_E, which is characteristic of aromatic compounds but not alkenes. This fact significantly challenges the well-established classical concept that alkenes do not undergo electrophilic substitution reactions. The obtained results of mechanistic studies have not only fundamental scientific value, but also practical application: using the bromination reaction studied, it is possible to perform the CH-functionalization of vinyl substrates in a single step with high efficiency. As a result of this functionalization, corresponding bromovinyl (2-bromovinyl) derivatives are obtained, which are valuable electrophilic synthons— building blocks for catalytic reactions of carbon–carbon (cross-coupling) and carbon–heteroatom (substitution) bond formation.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 5","pages":"934 - 942"},"PeriodicalIF":1.1,"publicationDate":"2025-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143581286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}