Protection of Metals and Physical Chemistry of Surfaces最新文献

{"title":"Biodegradation of the As-Bearing Flotation Concentrate with Silicate Bacilli","authors":"Tatiana Abashina,&nbsp;Alyona Yachkula,&nbsp;Andrey Machulin,&nbsp;Mikhail Vainshtein","doi":"10.1134/S2070205124701727","DOIUrl":"10.1134/S2070205124701727","url":null,"abstract":"<p>Biodegradation of mineral materials is object of great research interest. Its positive practical application is related with industrial bioleaching for microbial recovery of valuable metals from the low-grade ores and solid wastes. Its negative significance is related with biodestruction of building materials and includes both metal biocorrosion and mineral biodegradation. The most studied theme is bioleaching sulfide ores that is accompanied with the microbial sulfide oxidation. Meanwhile, biodegradation of silicates is still an insufficient studied problem. In this paper, authors present a research on possible role of the so-named “silicate bacilli” in biodegradation of the arsenopyrite gold-bearing flotation concentrate which is refractory, toxic, and contains aluminosilicates. The paper belongs both to materials science and microbiology and describes biodegradation of silicate materials, namely: (1) isolation of the silicate bacilli from the concentrate and their identification, (2) experiments on the biodegradation of the concentrate with the strains, (3) bacterial formation of micro-voids on the mineral surface, (4) study on the strain resistance to toxic mineral arsenic via genetic analyses of their genomes. In general, the work presents the first suggestions about ways of the surface biodestruction in solid aluminosilicates that realized by silicate bacteria.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 3","pages":"381 - 389"},"PeriodicalIF":1.1,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142870325","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":"Corrosion Behaviour of Boronized Ductile irons in Formic and Nitric Acid Solutions","authors":"Gülcan Toktaş,&nbsp; Selman Korkmaz","doi":"10.1134/S207020512470182X","DOIUrl":"10.1134/S207020512470182X","url":null,"abstract":"<p>The corrosion behavior of boronized Cu, Ni, and Mo-alloyed and unalloyed ductile irons in two acid solutions was investigated using the gravimetric method. Ductile irons were pack boronized at 900 and 950°C for 2, 4, 6, and 8 h. The boride-layer compounds were detected using X-ray analysis. Boronized and untreated irons were immersed in 10 wt % formic acid and 10 wt % nitric acid solutions for 14 days (336 h). Every two days, mass losses were measured, and corrosion rates were estimated using these results. The corroded surfaces were examined with scanning electron microscopy. Untreated alloyed ductile cast iron lost less mass in both acid solutions than unalloyed cast iron. Pitting is the most common type of corrosion in formic acid solution. Higher corrosion rates after 48 h of immersion decreased dramatically in 96 h for all irons due to the passivation effect of the nitric acid solution.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 3","pages":"535 - 543"},"PeriodicalIF":1.1,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142870259","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 Rubus fruticosus Leaf Extract as an Eco-Friendly Copper Corrosion Inhibitor","authors":"Milica Zdravković,&nbsp;Vesna Grekulović,&nbsp;Jasmin Suljagić,&nbsp;Nada Štrbac,&nbsp;Ivana Marković,&nbsp;Milan Gorgievski,&nbsp;Miljan Marković","doi":"10.1134/S2070205124701843","DOIUrl":"10.1134/S2070205124701843","url":null,"abstract":"<p>The behavior of copper in 0.5 mol/L NaCl containing different <i>Rubus fruticosus</i> leaf extract (RFLE) concentrations was studied. Electrochemical methods such as open circuit potential (OCP) measurement and cyclic voltammetry (CV) were performed. The weight loss measurements were performed at different immersion times to determine the time influence on copper corrosion in the solution without and with the addition of RFLE. UV–Vis spectrophotometry was used to examine whether the formation of a copper-extract complex occurs. The characterization of the copper surface after exposure to the solution with the addition of 15 g/L RFLE was performed using SEM-EDS analysis. The results show the examined extract acts as a good copper corrosion inhibitor in 0.5 mol/L NaCl. Both electrochemical methods indicate that blackberry leaf extract acts as a mixed type of inhibitor. Better CV results were achieved in the presence of higher extract concentrations. The gravimetric results show that corrosion rate values decrease with an increase in the RFLE concentration. The lowest value of the corrosion rate was obtained with the addition of 15 g/L RFLE, after 10 days, with an inhibition efficiency of 99.1%. The UV–Vis absorption spectrums confirmed the formation of a complex between copper and extract molecules. SEM-EDS analysis confirmed that RFLE molecules adsorb on the copper surface, acting as a corrosion inhibitor.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 3","pages":"544 - 553"},"PeriodicalIF":1.1,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142870320","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":"Molecular Dynamics Simulation of the Interaction between Alkaline NaCl Solution and Carbon-Supported Composite Electrodes","authors":"Jianping Zeng,&nbsp;Haibo Yang,&nbsp;Haichuan Zuo,&nbsp;Song Chen","doi":"10.1134/S2070205124701855","DOIUrl":"10.1134/S2070205124701855","url":null,"abstract":"<p>Using carbon-supported (M/C, M = Ag, MnO, MnO₂, Mn₃O₄ and Pd) composite electrodes as the oxygen depolarized cathode (ODC) for chlor-alkali electrolysis, the energy consumption can be greatly reduced. However, the electrode stability and mass transfer process caused by the interaction between the ODC and the electrolyte solution are not very ideal, resulting in low efficiency of the electroreduction reaction, and its mechanism is still unclear. In this work, the interaction model of ORR of M/C electrodes in alkaline NaCl solution (ANS) were constructed, and MD simulation of the models were carried out. Based on the calculation and analysis of the interaction energy, diffusion coefficient and radial distribution function, the interaction law between the carbon-supported composite electrode and ANS was found out, and the interaction mechanism was revealed. The results showed that the interaction between O₂ in ANS and different M/C electrodes is mutually attractive at 353 K, and the order is Ag/C &gt; Pd/C &gt; MnO/C &gt; MnO₂/C &gt;Mn₃O₄/C. The change law of diffusion coefficients of O₂ in different M/C composite electrode systems is consistent with that of the interaction energy, but the ANS is opposite. O₂ molecule needs to break through the interaction between ANS and M/C composite electrode to interact with the composite electrode. The results of RDF illustrated that it is difficult for O₂ molecule to bond with the active component M in different M/C electrodes in the short-range region, but they form non-bonding interaction in the remote region. On the other hand, ANS and the active component M of different M/C electrodes have bond interaction in the short-range region, and non-bond interaction is greater than bond interaction in the remote region. These results provide theoretical basis for further research and development of electrode materials in chlor-alkali electrolysis industry.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 3","pages":"355 - 363"},"PeriodicalIF":1.1,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142870322","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":"Hydrophobic Coatings on Aluminum Substrate Based on Different Metal Oxides: Co3O4, ZnO, and MgO","authors":"Zehira Belamri","doi":"10.1134/S2070205124701740","DOIUrl":"10.1134/S2070205124701740","url":null,"abstract":"<p>The formation of different nanostructured metal oxides, Co₃O₄, ZnO, and MgO, has been carried out by thermal oxidation at 500°C using a low-cost electroplating technique at ambient temperature. The structure and morphology of the elaborated layers, along with their hydrophobic properties, have been investigated using various surface characterization techniques such as X-ray diffraction (XRD), Raman spectroscopy, field emission gun scanning electron microscope (FEG-SEM), and EDX analysis. The wettability properties of the elaborated coating were evaluated by measuring the contact angle between the surface of the films and a deposited water drop (WCA). The obtained results suggest the existence of metal oxide phases after thermal oxidation at 500°C with a nanometric crystallite size. Structural characterization by XRD demonstrates that the synthesized thin films were polycrystalline. The Raman analysis shows normal vibrational modes, which correspond to the structure of each thin film. The morphological study of elaborated thin film coatings illustrates the formation of nanometric grains distributed uniformly on the surface of each thin film. The surface morphologies change throughout the oxide type. The best hydrophobicity with WCA of 136.93° is obtained for MgO coating with nanowire morphology.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 3","pages":"390 - 396"},"PeriodicalIF":1.1,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142870254","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":"Lavandula angustifolia Extract as a Green Corrosion Inhibitor for Protection of Mild Steel in HCl Acid Solution","authors":"Selim Arslanhan,&nbsp;Gökmen Sığırcık,&nbsp;Reşit Yıldız,&nbsp;Mehmet Fırat Baran","doi":"10.1134/S2070205124701739","DOIUrl":"10.1134/S2070205124701739","url":null,"abstract":"<div><p>A new <i>Lavandula angustifolia</i> extract was prepared to investigate the anti-corrosion effect against mild steel in corrosive environment. Inhibitory performance of green extract was examined in detail with electrochemical, morphological, as well as quantum chemical calculation analyses. The effects of inhibitor concentration and exposure time were examined to describe the inhibition behavior. Physical and chemical adsorption kinds happen between the surface of the steel and <i>Lavandula angustifolia</i> extract. Furthermore, surface analysis studies were applied to justify the formation of protective adsorption coating occurred on the surface of steel. Quantum chemical calculation results are also in good consistent with other experimental outcomes.</p></div>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 3","pages":"554 - 570"},"PeriodicalIF":1.1,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142870255","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 Chitosan Crosslinked with Citric Acid Coating on Kraft Paper for Food Packaging Applications","authors":"Pawinee Theamdee,&nbsp; Penpetch Pliantong","doi":"10.1134/S2070205124701818","DOIUrl":"10.1134/S2070205124701818","url":null,"abstract":"<p>Chitosan (CS) films were prepared by crosslinking them with citric acid (CA) at various concentrations (0, 0.1, 0.2, 0.3, 0.4, and 0.5 wt %, calculated based on the dry weight of CS). These films were prepared using the solution blending-casting method and then dried at 50°C for 15 h. The thickness, water activity (<i>a</i>_w), and water vapor permeability (WVP) of these films were investigated. The thickness of the films ranged from 0.30 to 0.60 mm, while the a_w of the films ranged from 0.48 to 0.55. Importantly, the properties of the films showed changes that correlated with the varying CA content, and Fourier transform infrared (FTIR) confirmed the crosslinking between CS and CA. Subsequently, kraft paper was coated with CS solution at different CA concentrations. Basis weight, water adsorption, oil resistance, puncture strength, and tear strength were measured. The results indicated that the properties of the CS films crosslinked with CA showed improvement when compared to the uncross-linked films. However, excessive CA addition in the films had negative effects due to the solidifying crystals of CA on the film surface. After 3 months, the degradation of the paper coating films reached 26.98%. The findings suggested that the kraft paper-coated chitosan crosslinked with 0.3 wt % CA exhibited the best overall properties. This study has the potential for application as a paper-coating film in the food industry.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 3","pages":"430 - 437"},"PeriodicalIF":1.1,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142870258","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":"Corrosion Inhibition Efficiency of Metal Complex of Carboxymethylchitosan in 3.5% NaCl","authors":"V. Nayana Senan,&nbsp;K. S. Beena Kumari,&nbsp;O. Lekshmy","doi":"10.1134/S2070205124701806","DOIUrl":"10.1134/S2070205124701806","url":null,"abstract":"<p>The effectiveness of zinc carboxymethylchitosan metal complex (ZCMC) as a copper corrosion inhibitor in 3.5% NaCl solutions was investigated using electrochemical impedance spectroscopy, Tafel extrapolation techniques and SEM/EDX. The potentiodynamic polarisation investigations demonstrate that ZCMC is a good inhibitor for copper in neutral media. In 3.5% NaCl solutions, it more significantly reduces the anodic reaction rate than the cathodic reaction rate and increases the open circuit potential of copper. This Cu(II) is generated by oxidation of the Cu(I) ion formed at the beginning of the corrosion process in the aerated solution of NaCl. SEM-EDX studies confirmed the absence of the deterioration products on the copper surface.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 3","pages":"511 - 518"},"PeriodicalIF":1.1,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142870321","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":"Anticorrosion Performance of TiO2/Epoxy Films with Doped Polyaniline and Poly(o-ethoxyaniline) Applied to Carbon Steel in 3.5 wt % NaCl Acid Solution","authors":"Nacer Mounir,&nbsp;Malha Nazef,&nbsp;M’hamed Bousbai,&nbsp;Hamid Yousfi","doi":"10.1134/S2070205124701788","DOIUrl":"10.1134/S2070205124701788","url":null,"abstract":"<p>In an effort to enhance the corrosion resistance of carbon steel in hostile environments, researchers have incorporated doped conductive polymers with sulfo-5-salicylic acid, such as polyaniline (PANI) and poly(ortho-ethoxyaniline) (POEA), into a conventional epoxy resin dissolved with xylene solvent. The primary objective was to develop more effective anticorrosion films compared to traditional zinc phosphate (ZP) coatings. The newly created epoxy resin coatings underwent thorough characterization methods; including techniques such as Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), atomic force microscopy (AFM), and immersion tests. To assess the corrosion resistance of these coatings, a range of tests were performed, as did the open circuit potential (OCP), linear polarization resistance (LPR), potentiodynamic polarization curves (Tafel plots), electrical impedance spectroscopy (EIS), and solution iron analysis extended to 3.5 wt % NaCl solution at pH 4.5. The results clearly demonstrated a substantial improvement in the corrosion resistance when the PANI and POEA coatings were applied, outperformed the ZP coating. These enhancements were attributed to a tenfold increase in the impedance of the ZP coating, a significant reduction in substrate degradation, and a threefold decrease in iron loss into the solution. These findings suggest that PANI−TiO₂/epoxy and POEA−TiO₂/epoxy coatings hold great promise as potential replacements for traditional zinc phosphate-based anticorrosion coatings, thanks to their superior protective barrier and enhanced performance.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 3","pages":"493 - 510"},"PeriodicalIF":1.1,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142870326","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 Comparison of Localized Corrosion Behavior of Hastelloy X and Stainless Steel 316 in Persian Gulf Costal Water","authors":"M. Jalali,&nbsp;P. Najafisayar","doi":"10.1134/S2070205124701752","DOIUrl":"10.1134/S2070205124701752","url":null,"abstract":"<p>Localized corrosion behaviors of Hastelloy X and stainless steel 316 in Persian Gulf coastal water were compared fundamentally using cyclic potentiodynamic polarization (CPC), electrochemical impedance spectroscopy (EIS), Mott–Schottky analysis. X-ray diffraction spectroscopy and scanning electron microscopy techniques. The results showed that passive films that are formed on Hastelloy X and stainless steel 316 are mainly include nickel and chromium oxides that exhibit <i>p</i>-type semiconducting behavior. The films that are formed on the surface of former include less crystal defects than those on the latter one surface. In both cases, films with more crystal defects will form when their respective formation temperature increases. Such passive films’ characteristics lead to find Hastelloy X to be more resistant to localized corrosion than stainless steel 316 in Persian Gulf water as was proved by the CPC and EIS test results; i.e. as the temperature increases from 25 to 75°C, pitting corrosion resistance (<i>R</i>_pit) and film resistance (<i>R</i>_film) values decreased in the case of Hastelloy X and stainless steel 316 samples while the former is more resistant to corrosion than the latter.</p>","PeriodicalId":745,"journal":{"name":"Protection of Metals and Physical Chemistry of Surfaces","volume":"60 3","pages":"482 - 492"},"PeriodicalIF":1.1,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142870256","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}