Protection of Metals and Physical Chemistry of Surfaces最新文献

{"title":"Sorption of Nickel Ions on Iron(III) Hydroxide Freshly Precipitated from a Solution of Iron(II) Sulfate. Part 2. Structure and Composition of Iron(III) Hydroxide Precipitates","authors":"O. D. Linnikov,&nbsp;I. V. Rodina,&nbsp;G. S. Zakharova,&nbsp;I. V. Baklanova,&nbsp;Yu. V. Kuznetsova,&nbsp;A. P. Tyutyunnik,&nbsp;Z. A. Fattahova,&nbsp;L. Yu. Buldakova","doi":"10.1134/S2070205124701880","DOIUrl":"10.1134/S2070205124701880","url":null,"abstract":"<p>A comparative analysis of the composition and structure of freshly precipitated iron(III) hydroxide precipitates obtained from a solution of iron(II) sulfate in the presence of sodium sulfate (400 mg/L) at pH 7 and 8 before and after sorption of nickel ions on them was carried out. Using IR and Raman spectroscopy and X-ray phase and thermogravimetric analysis, it was shown that the precipitates have the gross formula Fe₂O₃⋅2H₂O and contain small amounts of goethite (α-FeOOH) and lepidocrocite (γ-FeOOH). It has been established that the sorption of nickel ions on these precipitates is not accompanied by chemisorption, i.e., the formation of mixed compounds between iron and nickel. The ζ potential of precipitate particles at pH &lt; 6 has a positive value, and at pH &gt; 6 it becomes negative. The point of zero charge of precipitate particles corresponds to pH 6.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 3","pages":"373 - 380"},"PeriodicalIF":1.1,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142870472","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":"Study of Catalytic Properties and Corrosion Resistance of Nickel Foam on Copper Substrate in the Process of Ethanol Low-Temperature Oxidation in a Strongly Alkaline Environment","authors":"K. R. Tarantseva,&nbsp;K. V. Tarantsev,&nbsp;E. A. Polyanskova","doi":"10.1134/S2070205124701910","DOIUrl":"10.1134/S2070205124701910","url":null,"abstract":"<p>Catalytic activity of nickel foam on a copper substrate in the process of ethanol oxidation in highly alkaline media proposed for membraneless fuel cells was studied using cyclic voltammetry and electrochemical impedance methods. Studies confirmed the high activity of the NiFoam/Cu catalyst in the processes of ethanol oxidation in these media. It was revealed that ethanol oxidation on nickel foam occurs according to the mechanism of ethanol oxidation in highly alkaline media. Ethanol begins to oxidize at potentials from ‒350 mV on Ni(OH)₂ and then continues to oxidize after the formation of Ni(OOH) oxyhydroxide, when the nickel oxidation state changes from +2 to +3. Studies showed the catalyst high chemical stability, its swelling and peeling off from the substrate were not observed. It has been shown that this catalyst can be used as a basis for subsequent application of layers of cobalt, iron and other component oxides to it in order to improve its catalytic characteristics in low-temperature ethanol oxidation processes.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 3","pages":"463 - 474"},"PeriodicalIF":1.1,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142870477","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":"Sorption of Nickel Ions on Iron(III) Hydroxide Freshly Precipitated from a Solution of Iron(II) Sulfate. Part 1. Mechanism and Efficiency of the Sorption Process","authors":"O. D. Linnikov,&nbsp;I. V. Rodina","doi":"10.1134/S2070205124701879","DOIUrl":"10.1134/S2070205124701879","url":null,"abstract":"<p>The paper studies the sorption properties of iron(III) hydroxide obtained by precipitation from a solution of iron(II) sulfate in relation to nickel ions. The study was carried out at room temperature on a model solution of sodium sulfate (400 mg/L), which imitated polluted natural and waste water. It is shown that the removal of nickel ions from a model solution by a precipitate of freshly precipitated iron(III) hydroxide at pH 7 and 8 is described with satisfactory accuracy by the classical Freundlich, Langmuir, and Dubinin–Radushkevich adsorption isotherms. The values of free energy of adsorption calculated using this last equation do not exceed 8 kJ/mol, which indicates the physical nature of adsorption and excludes ion-exchange interaction of nickel ions with iron(III) hydroxide. The most complete removal of nickel ions from solution occurs during sorption with iron(III) hydroxide at pH 8. The sorption capacity of iron(III) hydroxide for nickel ions, both at pH 7 and at pH 8, is almost an order of magnitude greater than the similar value for many mineral, carbon, and coal sorbents. A comparison of the efficiency of sorption purification of a model solution using iron(III) hydroxide precipitates obtained by precipitation from solutions of iron(II) sulfate and iron(III) chloride showed that the deepest removal of nickel ions is achieved using iron(III) hydroxide precipitates obtained from a FeCl₃ solution.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 3","pages":"364 - 372"},"PeriodicalIF":1.1,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142870474","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":"Formation of SiO2@NPs (NPs = Ag, Au, CdS) Coatings on Slides from Decane Organogels in the Presence of AOT","authors":"T. Yu. Podlipskaya,&nbsp;N. O. Shaparenko,&nbsp;A. I. Bulavchenko","doi":"10.1134/S2070205124701892","DOIUrl":"10.1134/S2070205124701892","url":null,"abstract":"<p>A possibility of isolating gels from organosols of silica by high-speed centrifugation is demonstrated. Organosols of Ag, Au, and CdS nanoparticles (NPs) synthesized in reverse emulsions of AOT are used as the staining additives. Porous rough coatings are molded from the gels by the Doctor Blade method followed by drying and thermolysis at 500°C. The obtained coatings are promising for medical and biological, photovoltaic, and photocatalytic applications.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 3","pages":"409 - 417"},"PeriodicalIF":1.1,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142870475","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 Influence of Plasma Electrolytic Oxidation Parameters on the Composition, Structure, and Surface Properties of Rare-Earth WE43 Magnesium Alloy","authors":"A. V. Pospelov,&nbsp;A. A. Kasach,&nbsp;D. S. Kharitonov,&nbsp;A. R. Tsyganov,&nbsp;I. I. Kurilo","doi":"10.1134/S2070205124701909","DOIUrl":"10.1134/S2070205124701909","url":null,"abstract":"<p>The influence of the parameters of the plasma-electrolytic oxidation process of WE43 magnesium alloy in a pyrophosphate electrolyte on the structure, composition, and protective properties of the formed coatings was studied using scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray phase analysis, and electrochemical methods. It has been shown that, with an increase in the duration of plasma electrolytic oxidation, the porosity of the formed coatings decreases and the content of magnesium orthophosphate in their composition increases. It was found that, compared to the original sample of WE43 alloy, PEO helps to reduce the corrosion rate in Hanks solution by 4.1–31.6 times.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 3","pages":"449 - 462"},"PeriodicalIF":1.1,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142870420","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":"A Study of the Physicochemical Properties of an Al–2.3% V Alloy-Based Powder As a Feedstock for 3D Printing","authors":"V. G. Shevchenko,&nbsp;D. A. Eselevich,&nbsp;N. A. Popov,&nbsp;M. N. Baklanov","doi":"10.1134/S2070205124701922","DOIUrl":"10.1134/S2070205124701922","url":null,"abstract":"<p>Thermogravimetry, combined with differential scanning calorimetry and single-wave ellipsometry, was used to study the thermal stability and protective properties of oxide films of Al–2.3% V alloy powder in compressed and bulk forms over a temperature range of 25–1200°C in air. Optical constants measured on massive polycrystalline samples were employed to examine the growth of the oxide layer and the change in the metal content on the surface of the initial aluminum and Al–2.3% V alloy powders compressed into tablets. The influence of the vanadium alloy additive on the structural changes of the surface oxide of aluminum powder under conditions of programmable heating was explained.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 3","pages":"475 - 481"},"PeriodicalIF":1.1,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142870470","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 Role of the Mesh Size of Modified Mica in CO2–Cl– Environment Resistant Epoxy Coatings","authors":"Han Yu,&nbsp; Shidong Zhu,&nbsp;Anqing Fu","doi":"10.1134/S2070205124701867","DOIUrl":"10.1134/S2070205124701867","url":null,"abstract":"<p>The corrosion resistance of pure epoxy resin coatings in oil and gas fields must be enhanced by the addition of filler to meet the demands of the severe service environment, particularly under an environment with high Cl^– and CO₂ contents. In this work, mica materials with different mesh sizes (400^#, 800^#, and 1250^#) were first modified to enhance compatibility with epoxy resin, and then 35 wt % modified mica was doped into epoxy resin to prepare composite coatings, and the effect of the modified mica mesh on the corrosion resistance of the composite coatings in a high Cl^– environment containing CO₂ was studied. For these materials, the thermal stabilities of the epoxy resin coatings with modified mica were analyzed using a thermogravimetric analyzer, the service environment was simulated by an autoclave, the electrochemical characteristics were studied using an electrochemical workstation, and the surface characteristics were observed by scanning electron microcopy. The results showed that mica was improved by modification with a silane coupling agent, and that with an increase in the mesh size, the uniform distribution of the mica, open circuit potential, capacitance arc radius, and adhesion of the composited coating first increased and then decreased, while the self-corrosion current density, water absorption, and diffusion coefficient showed the opposite trend. When the mesh size of the modified mica was 800^#, the highest charge transfer resistance (7.404 × 10⁸ Ω cm²), and adhesion (7.26 MPa), and the smallest double electric layer capacitance (6.814 × 10^–9 F cm^–2), composite coating capacitance (3.866 × 10^–10 F cm^–2), self-corrosion current density (3.441 × 10^–10 A cm^–2), final saturated water uptake (2.03%), and diffusion coefficient (5.306 × 10⁷ cm² s^–1) were observed, indicating that the composite coating with the 800^# modified mica soaked for 240 h still had the best corrosion resistance. Finally, a corrosion resistance evolution mechanism was proposed for composite coatings containing epoxy resin with different mesh sizes of modified mica.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 3","pages":"438 - 448"},"PeriodicalIF":1.1,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142870260","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":"Mechanical and Tribological Evaluation of Zinc/Zinc-Zirconia Composite Coatings on Ti6Al4V Alloys","authors":"Kaan Kuştepe,&nbsp; Ebru Saraloğlu Güler","doi":"10.1134/S2070205124701764","DOIUrl":"10.1134/S2070205124701764","url":null,"abstract":"<p>Zinc plays a vital role in supporting prenatal and postnatal growth and development. Moreover, for over a century, zinc and its alloys have been extensively used as coatings to enhance the surface properties of various metals. However, zinc coatings alone exhibit limited resistance to frictional loads, which necessitates their combination with ceramic particles. Particle reinforced composite coatings have emerged as a promising solution to further enhance the mechanical and tribological properties of metals. This study focuses on the electroplating of zinc and zinc reinforced with ZrO₂ onto Ti₆Al₄V alloys, exploring the impact of coating parameters on the thickness and mechanical behavior of the coatings. Through a comprehensive analysis, including electron microscope examination (SEM) of the microstructure, tribometer measurements, scratch resistance test, adhesion strength analysis and atomic force microscope (AFM) assessment of surface roughness, the performance of the coated Ti₆Al₄V alloys is investigated. The results demonstrate that the Zn–ZrO₂ composite coated specimen exhibits the lowest minimum wear rate. Additionally, an increase in the incorporation of ZrO₂ particles correlates with a decrease in the wear rate.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 3","pages":"418 - 429"},"PeriodicalIF":1.1,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142870257","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":"Effective Tricationic Surfactants that Prevent Oxidation of Iron Atoms on the Metal Surface in Acidic Environment","authors":"Serkan Öztürk,&nbsp;Fatih Şeker,&nbsp;Gülşen Akgül","doi":"10.1134/S207020512470179X","DOIUrl":"10.1134/S207020512470179X","url":null,"abstract":"<p>One of the methods that can avoid the rapid corrosion of the metal surface, which occurs when iron atoms on steel surface are oxidized in an acidic environment, is to use suitable inhibitors. From this point of view, in this study, 4 tricationic surfactants containing long chains of 14 to 16 carbons at the end of the compound and 6 to 11 carbons in the middle of the compound were synthesized. The FT-IR and NMR spectra confirmed the chemical formulas of these surfactants. The surfactants’ physicochemical parameters (critical micelle concentrations, surface tensions at these concentrations and Gibbs free energies of micelle formation) were determined. Then, their effectiveness against the corrosion of the metal surface by iron atoms’ oxidation in 1.0 M HCl solution was measured by gravimetric method. For this purpose, metal coupons were immersed in acid solutions with and without inhibitors for twenty-four hours at room temperature. Very good inhibition efficiencies (around 95–97%) were obtained for different inhibitor concentrations (1, 5, 10, 25, 50, 100, 250 ppm) in the rust tests. The equilibrium constants (<i>K</i>_ads) and Gibbs free energies (Δ<i>G</i>_ads) of their adsorption on the metal surface, which are the reason for these strong inhibition activities, were calculated by Langmuir Isotherm studies. To support their anticorrosion activity, the metal surfaces’ contact angles and scanning electron microscopy images with 1000 times magnification were obtained.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 3","pages":"519 - 534"},"PeriodicalIF":1.1,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142870323","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":"Effect of TiO2 and SiO2 Nanoparticles on the Bisphenol A Diglycidyl Ether (BADGE) and its Derivatives Migration from Food Can Coatings","authors":"Shekoofa Layeghi,&nbsp;Davood Zaarei,&nbsp;Morteza Ehsani,&nbsp;Ramin Khajavi,&nbsp;Saeedeh Mazinani","doi":"10.1134/S2070205124701831","DOIUrl":"10.1134/S2070205124701831","url":null,"abstract":"<p>Epoxy coatings have common application as inner surface coating of food cans and have good mechanical properties, adhesion, flexibility and integrity and protect food cans against corrosion. These coatings contain bisphenol A diglycidyl ether (BADGE), also bisphenol A (BPA) units as residues, which are toxic and there is danger for migration of these derivatives into the Foodstuffs and poisoning them. In this research, titanium dioxide and silica nanoparticles were added into the formulation of epoxy can coating and its effects on migration of BPA and BADGE derivatives was investigated by using Inductively coupled plasma (ICP) and High-performance liquid chromatography (HPLC) test methods. Also, Physical and mechanical properties as well as coatings resultant safety were studied. Observations clarified that the coatings’ hardness was increased by adding 0.5 wt % of SiO₂ nanoparticles. Mechanical properties of coating had no noticeable changing by addition of TiO₂ nanoparticles up to 0.75 wt %, but the gloss was decreased. The migration rates of TiO₂ and SiO₂ were negligible. The migration rate of BPA and BADGE derivatives were lower than acceptable limit mentioned in Commission Regulation (EU 10/2011), with Commission Regulation (EC) No 1895/2005, respectively. The lowest migration rate of the BADGE, beside its hydrated, also, hydrochloride derivatives (BADGEs), into acidic and alcoholic food simulants, was belong to the epoxy coating containing 0.5 and 0.15 wt % of TiO₂ nanoparticles, respectively. Also, the lowest values of BADGEs migration, into the acidic and alcoholic food simulants, was belong to the coatings containing 0.15 and 0.3 wt % of SiO₂, respectively.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 3","pages":"397 - 408"},"PeriodicalIF":1.1,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142870324","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}