Zastita materijala最新文献_第6页

Confrontation of linear versus nonlinear approach in Fe2B boridelayer thickness predictions Fe2B 硼化物层厚度预测中线性方法与非线性方法的对抗

Zastita materijala Pub Date : 2024-03-15 DOI: 10.62638/zasmat1016

Y. El Guerri, B. Mebarek, Mourad Keddam

引用次数: 0

A review on improved physical and thermal properties of oxide nanoparticles reinforced epoxy composites 氧化物纳米颗粒增强环氧树脂复合材料物理和热性能改进综述

Zastita materijala Pub Date : 2024-03-15 DOI: 10.62638/zasmat1038

A. Upadhyay, M. Goyat

{"title":"A review on improved physical and thermal properties of oxide nanoparticles reinforced epoxy composites","authors":"A. Upadhyay, M. Goyat","doi":"10.62638/zasmat1038","DOIUrl":"https://doi.org/10.62638/zasmat1038","url":null,"abstract":"Epoxy resins are well-known because of their desirable thermal and mechanical characteristics in a variety of fields, including the automotive, construction, and aerospace sectors. However, the inherent brittle nature of highly cross-linked epoxy resins generally leads to weakness in resisting the formation of cracks and their movement. The brittleness of the epoxy resins is one of the major obstacles inhibiting its use at a wider scale. Therefore, many researchers focused on reinforcement of epoxy resins by different types of nanostructures including carbon nanotubes (CNTs), organic/inorganic nanofillers to provide higher strength, without diminishing other essential thermo-physical characteristics of the nanocomposites. Most of the review articles focused on the CNT-reinforced epoxy composites and very limited review articles are available that focus on the oxide nanofiller reinforced epoxy composites. In this review article, epoxy nanocomposites reinforced with alumina (Al2O3), titania (TiO2), silica (SiO2), and zirconia (ZrO2) nanoparticles have been investigated. The influence of the oxide nanoparticles in modifying the physical and thermal properties of the epoxy nanocomposites has been presented, compared, and critically analysed to optimize the performance of epoxy nanocomposites.","PeriodicalId":23842,"journal":{"name":"Zastita materijala","volume":"7 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140241168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Corrosion inhibition of carbon steel by eucalyptus leaves in acidic media: An overview 桉树叶在酸性介质中对碳钢的缓蚀作用：综述

Zastita materijala Pub Date : 2024-03-15 DOI: 10.62638/zasmat1034

A. Ndukwe

{"title":"Corrosion inhibition of carbon steel by eucalyptus leaves in acidic media: An overview","authors":"A. Ndukwe","doi":"10.62638/zasmat1034","DOIUrl":"https://doi.org/10.62638/zasmat1034","url":null,"abstract":"This paper concerns the overview of previous studies on the corrosion and inhibition of carbon steel that is allowed to degrade in a corrosive medium by the extract of the eucalyptus plant, with an emphasis on the extract's adsorption behaviour. Many researchers have largely employed eucalyptus plant bark, oil, and leaf extracts to prevent the corrosion of mild steel in acidic environments under various temperature settings. According to the results, when the bark extract of the eucalyptus plant was added to HCl (5%) at a concentration of 900 ppm, the inhibitor's maximum efficiency was 98.2 %. The leaf extract, on the other hand, had the maximum inhibitory efficacy of 93.09 % at 600 mg/L extract concentration in the H2SO4 (0.5 M) medium. The extracts' potency was shown to diminish with increasing temperature. The mechanism for eucalyptus extract's protection of carbon steel from corrosion in diverse corrosive situations was largely associated with the adsorption of the extract's inhibitive components on the steel's surface to reduce the interaction between the metal and the corrosive surroundings. The majority of the reported inhibitive behaviour of the eucalyptus extract was consistent with the Langmuir adsorption isotherm model.","PeriodicalId":23842,"journal":{"name":"Zastita materijala","volume":"6 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140238973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reinforce the surface properties of domestic garbage activated carbon by low temperature plasma accustomed in energy storage applications 利用低温等离子体增强生活垃圾活性炭的表面性能，并将其应用于储能领域

Zastita materijala Pub Date : 2024-03-15 DOI: 10.62638/zasmat1000

Vijayalakshmi K.A, Sowmiya K C

{"title":"Reinforce the surface properties of domestic garbage activated carbon by low temperature plasma accustomed in energy storage applications","authors":"Vijayalakshmi K.A, Sowmiya K C","doi":"10.62638/zasmat1000","DOIUrl":"https://doi.org/10.62638/zasmat1000","url":null,"abstract":"Since activated carbon is a highly porous material with a sizable internal surface area, it is simple to adsorb a wide range of substances when used in energy storage devices, sewage treatment, water purification, catalyst, food processing and other applications. This work focuses on the viability of using mixed fruit peels as a precursor for the carbonization process with physical activation to produce activated carbon. The Phase confirmation was examined using X-ray diffraction (XRD). Fourier transform infrared spectrometer (FTIR) concludes the functional groups present in mixed fruit peels activated carbon. Field emission scanning electron microscopy (FESEM) was used to analyze the morphological makeup and textural traits of the activated carbon that was produced. Energy Dispersive X-Ray Analysis (EDX) shows the elemental composition of nano powdered carbon. Raman spectroscopy confirms the presence of graphene that appears at 1580cm-1. Electrochemical Impedance Spectroscopy (EIS) and Nyquist plot in order to evaluate the conductivity performance over the frequency range of 1mHz to 10 kHz, measurements were used.\u0000Carbon yield analysis were conducted and analyzed. Wettability of the mixed fruit peels were examined using contact angle. The Mixed Fruit peels activated carbon were subjected to low temperature plasma to increase its surface properties, The outcomes were evaluated, and the charge transfer resistance and the polarization resistance for air plasma treatment is 1.43 and 0.2 ohms. Hydrophilic nature is occurred when treated with air plasma. According to these findings, air plasma treatment of mixed fruit peel activated carbon improves its surface characteristics, making it suitable for electrode in energy storage applications.","PeriodicalId":23842,"journal":{"name":"Zastita materijala","volume":"4 35","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140241412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of white cement production during low-temperature firing 低温烧制白水泥的生产分析

Zastita materijala Pub Date : 2023-01-01 DOI: 10.5937/zasmat2303256c

Lev Chernyak, N. Dorogan, L. Melnyk, P. Varshavets, Victoria Pakhomova

引用次数: 0

Investigation of the corrosion inhibition properties of hexamine (HMTA) for mild steel in NaCl solution HMTA对低碳钢在NaCl溶液中的缓蚀性能研究

Zastita materijala Pub Date : 2023-01-01 DOI: 10.5937/zasmat2302134f

Fathabadi Ebrahim, M. Ghorbani

引用次数: 0

Characterization of zirconium oxidecoating stabilized with cerium and yttrium oxide deposited on the bonding coating nickel chromium aluminum cobalt yttrium oxide 在镍铬铝钴氧化钇键合涂层上沉积铈钇稳定氧化锆涂层的表征

Zastita materijala Pub Date : 2023-01-01 DOI: 10.5937/zasmat2301005m

M. Mrdak, Č. Lačnjevac, D. Bajić

{"title":"Characterization of zirconium oxidecoating stabilized with cerium and yttrium oxide deposited on the bonding coating nickel chromium aluminum cobalt yttrium oxide","authors":"M. Mrdak, Č. Lačnjevac, D. Bajić","doi":"10.5937/zasmat2301005m","DOIUrl":"https://doi.org/10.5937/zasmat2301005m","url":null,"abstract":"Zirconium dioxide ZrO2 is used as a basic material for thermal barriers and as a biomaterial for manufacturing parts for hip implants in orthopedic surgery and in dentistry for making crowns. Use of ZrO2 ceramics as an insulating material and biomaterial is due to its good chemical and dimensional stability, mechanical strength, toughness and elastic modulus. The aim of this study was to analyze the characteristics of zirconium oxide coating of stabilized cerium and yttrium oxide deposited by atmospheric plasma spraying (APS) process on the bond coating of nickel chromium cobalt yttrium oxide. Coatings were deposited on cold substrates and on substrates preheated to 180°C. Composite powder nickel chromium/aluminum/cobalt/yttrium oxide was used for the production of bond layers and for the ceramic layers zirconium oxide stabilized with cerium and yttrium oxide powder. Testing the quality of coatings was done by measuring microhardness of layers using the HV method and for bond tensile strength of the coating system tensile testing was applied. Metallographic evaluation of the share of pores in the bond and ceramic layers was performed with image analysis - processing of images from a light microscope. Powder particle morphology and EDS analysis were performed on the SEM. The obtained results confirm that the preheating temperature of the substrate has a significant impact on structural mechanical properties of the tested coatings system.","PeriodicalId":23842,"journal":{"name":"Zastita materijala","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76534246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of stress-corrosion cracking of welded joint of H70 steel under cathodic polarization in near neutral environment 近中性环境下阴极极化条件下H70钢焊接接头应力腐蚀开裂研究

Zastita materijala Pub Date : 2023-01-01 DOI: 10.5937/zasmat2301096n

L. Nyrkova, P. Lisovyi, Larysa Gonchasrenko, S. Osadchuk, Yulia Kharchenko, Anatoly Klymenko, V. Kostin

{"title":"Investigation of stress-corrosion cracking of welded joint of H70 steel under cathodic polarization in near neutral environment","authors":"L. Nyrkova, P. Lisovyi, Larysa Gonchasrenko, S. Osadchuk, Yulia Kharchenko, Anatoly Klymenko, V. Kostin","doi":"10.5937/zasmat2301096n","DOIUrl":"https://doi.org/10.5937/zasmat2301096n","url":null,"abstract":"Study of stress-corrosion cracking of welded joints made of X70 steel at cathodic polarization in near neutral solution NS4 was carried out. It was established that the tendency of base metal of X70 steel to stress-corrosion cracking, estimated by KS coefficient, increases from 1.07 to 1.13 whereas polarization potential changing from the corrosion potential to maximum protective potential -1.05 V. Such regularity correlates with increasing of hydrogen penetration through X70 steel, which at maximum protective potential -1.05 V is equal to 0.000518 mol/m3 . Susceptibility of welded joint is lower than the base metal, KS coefficient change not much near the value 1.0. With increasing of polarization potential from -0,75V to -1.05V fracture surface of X70 steel characterized by decreasing in the size of holes and the appearance of flat areas, through that the rupture occurred. A similar nature of the rupture was observed for the welded joint, but visually larger proportion of flat areas can be noted. It was established that the rupture of the welded joint occurs on the base metal, which allows to propose stress-corrosion cracking susceptibility factor KS to be legitimately used for estimation to stress-corrosion cracking of welded joint, provided the weld is performed in a high-quality manner. Stress-corrosion cracking results of welded joint of X70 steel correlate satisfactorily with the experience of stress-corrosion cracking on main gas pipelines, where stress-corrosion cracks form and develop along the base metal of gas pipelines.","PeriodicalId":23842,"journal":{"name":"Zastita materijala","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89692970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Biofuels as a challenge of sustainable development 生物燃料是可持续发展的挑战

Zastita materijala Pub Date : 2023-01-01 DOI: 10.5937/zasmat2303291p

Saša Papuga, Aleksandra Kolundžija, Milica Đurđević

引用次数: 0

Analyzes of hydrocarbons (PAH, alkanes and BTEX) in marine water of Vlora's port 维拉港海水中碳氢化合物(多环芳烃、烷烃和苯醚)的分析

Zastita materijala Pub Date : 2023-01-01 DOI: 10.5937/zasmat2302153h

Esmeralda Halo, Jonida Tahiraj, B. Murtaj, Sonila Kane, E. Marku, A. Nuro

{"title":"Analyzes of hydrocarbons (PAH, alkanes and BTEX) in marine water of Vlora's port","authors":"Esmeralda Halo, Jonida Tahiraj, B. Murtaj, Sonila Kane, E. Marku, A. Nuro","doi":"10.5937/zasmat2302153h","DOIUrl":"https://doi.org/10.5937/zasmat2302153h","url":null,"abstract":"In this study, levels of polycyclic aromatic hydrocarbons (PAH), aliphatic hydrocarbons (n-alkanes) and volatile hydrocarbons were determined in water samples of the port of Vlora which is the second largest port in Albania. It is located in Vlora Bay, near Vlora city. Presence of these pollutants in port area is mainly because of ships transport, commercial/passengers processing and the water currents in-side/out-side the port area. Hydrocarbons (PAHs, n-alkanes and BTEX) are generated mainly by the transport (automobiles, ships, trains, etc), extracting/processing of oil industry, coal mine and other industries. Forest burning and their natural background make them very often in environment. Water samples were taken in May 2022 in different stations of the Vlora's port (inside and outside its area). Aromatic and aliphatic hydrocarbons were extracted simultaneously using two steps liquid-liquid extraction (LLE) technique. Firstly, dichloromethane (MeCl2) and after that n-hexane were used as extraction solvents. After extraction, the organic phase was dried with sodium sulfate anhydrous, for water removing. \"Clean-up\" procedure was realized in an alumina column. After the concentration to 2 ml, the samples were injected in Varian 450 GC equipped with FID detectors. BTEX were analyzed using head space solid phase micro-extraction technique (HS/SPME) by using polydimethylsiloxane fiber (PDMS) followed by GC/FID technique. PAH, n-alkanes and BTEX were found almost in all water samples of Vlora's port. Their presence could be because of anthropogenic factors (elevated activity and ship transport) in the port area. The levels of hydrocarbons in water samples of Vlora's port were higher / comparable than reported levels for them in other stations of the Adriatic Sea, Albania part.","PeriodicalId":23842,"journal":{"name":"Zastita materijala","volume":"45 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85970014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0