Wyniki wyszukiwania - BazTech

1

Analiza zawartości suchej masy i makroelementów w nawozach naturalnych oraz ocena możliwości stosowania tych nawozów zgodnie z obowiązującymi przepisami

Tkaczyk Przemysław, Sawicka Jolanta, Igras Janusz

Przemysł Chemiczny

|

2025

|

T. 104, nr 7

702--707

PL

Przeprowadzono analizę zawartości suchej masy i zawartości azotu, fosforu, potasu, magnezu oraz wapnia w nawozach naturalnych pobranych z gospodarstw prowadzących produkcję zwierzęcą. Przebadano podstawowe nawozy, takie jak obornik, gnojowica, gnojówka i pomiot ptasi. Stwierdzono duże zróżnicowanie zawartości suchej masy i składników pokarmowych. Największe ilości analizowanych składników pokarmowych stwierdzono w pomiocie, nieco mniejsze w obornikach, a najmniejsze w gnojowicy i gnojówce. Wykazano, że stosowanie nawozów naturalnych zgodnie z maksymalnym limitem azotu wpłynie na przekroczenie dopuszczalnej ilości fosforu przy zastosowaniu każdego z badanych nawozów naturalnych, co pogorszy zarządzanie tymi nawozami w gospodarstwach rolnych.

EN

The dry matter content and the level of N, P, K, Mg and Ca in natural fertilizers collected from farms engaged in animal prodn. were analyzed. The studies included such natural fertilizers types as solid manure, slurry, liq. manure and poultry litter. Considerable variability in the dry matter content and nutrient content of the manures was obsd. The highest concns. of the analyzed nutrients were found in poultry litter, slightly lower in solid manure and the lowest in slurry and liq. slurry. The study showed that the use of org. fertilizers in accordance with the max. N limit would lead to exceeding the permissible P limit for each of the tested fertilizers, which would complicate the management of natural fertilizers on farms.

2

Synthesis and characterisation of magnesium-doped nanoparticles by the microwave combustion technique for novel applications

Baskar Sivaraman, Kanithan Sivaraman, Vignesh Natarajan, Santhosh N., Alfaisal Faisal M., Alam Shamshad, Majidi Hasan Sh., Algburi Sameer, Al-sareji Osamah J.

Materials Science Poland

|

2025

|

Vol. 43, No. 1

80--92

EN

In this study, synthesis and characterisation of magnesium-substituted Ni–Fe nanoparticles using microwave combustion are carried out. Using Schererr’s formula, the crystal size of the synthesised magnesium-substituted Ni–Fe nanoparticles is determined, which falls between 18 and 32 nm. Additionally, agglomerative spherical-shaped nanoparticles have been observed by high-resolution scanning electron microscopy investigation, and energy-dispersive X-ray spectroscopy is used to determine the elemental composition of Mg, Ni, Fe, and O. With the aid of diffuse reflectance spectroscopy, band gap values for the produced samples are determined to fall between 3.35 and 2.32 eV. Metal–oxygen tetrahedral sites are represented by the absorption band at 583 cm -1 , while octahedral sites are linked to the absorption bands at 436 and 457 cm-1. The nickel ferrite nanoparticles being replaced with magnesium show ferromagnetic hysteresis curves.

3

Porównanie zawartości magnezu, cynku oraz żelaza w różnych typach mięs z rozróżnieniem sposobu przygotowania przy użyciu atomowej spektrometrii absorpcyjnej

Gowin Aleksandra, Miklusiak Krystyna, Krakowska Agata

Analit

|

2025

|

Nr 15

25--32

PL

W niniejszym artykule przeprowadzono analizę zawartości magnezu, cynku oraz żelaza w trzech rodzajach mięs dostępnych w popularnym supermarkecie. Użyto mięsa drobiowego, wieprzowego oraz wołowego. Każde z mięs było badane w stanie surowym, ugotowane w wodzie destylowanej oraz usmażone na oleju roślinnym. Wszystkie próbki zostały poddane mineralizacji przy użyciu perhydrolu oraz kwasu azotowego. Analizę zawartości poszczególnych pierwiastków przeprowadzono przy użyciu atomowej spektrometrii absorpcyjnej.

EN

This article analyzes the content of magnesium, zinc, and iron in three types of meat available in a popular supermarket. Poultry, pork, and beef were used for the study. Each type of meat was examined in its raw state, cooked in distilled water, and fried in vegetable oil. All samples were mineralized using hydrogen peroxide and nitric acid. The analysis of the individual element contents was conducted using atomic absorption spectrometry.

4

Effect of higher contents of manganese and magnesium on the mechanical properties of twin-roll cast aluminium alloy EN AW-8011

Pavlasek Lukas, Bernatik Martin, Trojan Jan

Materials Science and Welding Technologies / Technologie Materiałowe i Spawalnicze

|

2024

|

Vol. 68, No. 4

art. no. 3

EN

Because of their excellent formability and sufficient mechanical properties, aluminium alloys based on an aluminium–iron–silicon system are very popular materials, commonly used in the production of thin foils. Alloy EN AW-8011 contains approximately 0.50–1.00 wt. % of iron and 0.40–0.80 wt. % of silicon. The other elements, including manganese and magnesium, are present only as impurities. However, these two elements are generally very effective enhancers of mechanical properties. Due to their very low concentrations in alloy EN AW-8011, the influence of manganese and magnesium on mechanical properties is often overlooked. In the research work discussed in the article, the properties of two Twin-Roll cast aluminium alloy EN AW-8011 containing various amounts of manganese and magnesium were investigated using optical microscopy, scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and tensile tests. The test results revealed that higher contents of magnesium and manganese significantly changed the mechanical properties of the alloy.

PL

Ze względu na swoją doskonałą odkształcalność i odpowiednie właściwości mechaniczne, stopy aluminium na bazie układu aluminium – żelazo – krzem są bardzo popularnymi materiałami stosowanymi w produkcji cienkich folii. Stop EN AW-8011 zawiera około 0,50–1,00% żelaza oraz 0,40–0,80% krzemu. Pozostałe pierwiastki, w tym, m.in. mangan oraz magnez, występują jedynie w postaci zanieczyszczeń, chociaż na ogół bardzo skutecznie poprawiają właściwości mechaniczne stopów. Ze względu na bardzo niskie stężenia manganu i magnezu w stopie EN AW-8011, ich wpływ na właściwości mechaniczne stopu jest często pomijany. Artykuł przedstawia badania właściwości dwóch, uzyskanych metodą Twin-Roll, odlewanych stopów aluminium EN AW-8011 o różnej zawartości manganu i magnezu. Badania obejmowały obserwacje z użyciem mikroskopu optycznego oraz skaningowego mikroskopu elektronowego, analizy z zastosowaniem spektroskopii rentgenowskiej z dyspersją energii oraz próby rozciągania. Badania wykazały, iż większa zawartość magnezu oraz manganu prowadzi do istotnych zmiany właściwości mechanicznych ww. stopu.

5

The Boron Solubility in Al-Mg-B Alloys

Zeman J., Herman Ales, Šerák J.

Archives of Foundry Engineering

|

2024

|

Vol. 24, iss. 4

15--20

EN

This study deals with the effect of magnesium content in Al-Mg-B alloy (with a boron content of about 5 wt. %) on the formation of intermetallic phases and elimination of inclusions in the form of boron powder particles in the final structure. At first look, the high melting temperature difference between pure aluminium (660 °C) and boron (2 076 °C) appears to be a potential problem. Moreover, boron has a minimal solubility in aluminium (0.055 wt.%) and the liquidus temperature increases very rapidly with increasing boron content (liquidus temperature approx. 1 160 °C at 5 wt.% for Al-B binary alloy). Alloying with magnesium results in the transformation of the intermetallic phases AlB12 and AlB2 to the (Al, Mg)B2 phase and has a significant beneficial effect on the formation of intermetallic boron phases in the aluminium alloy without residual boron powder particles.

6

Wymywanie jonów magnezu, chromu, manganu i cynku z odpadów pohutniczych w zależności od pH opadów atmosferycznych

Kocoł Patrycja, Porębska Gabriela, Muller Dominik, Zalewska Aleksandra

Analit

|

2024

|

Nr 14

19--28

PL

W niniejszym artykule zajęto się sprawdzeniem intensywności wymywania poszczególnych jonów metali z różnych warstw hałdy żużlu stalowniczego pochodzącej z huty stali w Ostrowcu Świętokrzyskim. Wymywania dokonano symulując opady atmosferyczne - wykorzystując wodę destylowaną, jak i sztuczne kwaśne deszcze (roztwór kwasu azotowego (V) o pH ≈ 2). Próbki pobrano z terenu składowiska odpadów poprzemysłowych, należących do firmy Madrohut w Krakowie, zarówno z wierzchniej warstwy hałdy jak i z głębokości 0.5 m w głąb hałdy, które zostały następnie poddane suszeniu na powietrzu. Do oznaczeń wykorzystano metodę Atomowej Spektrometrii Absorpcyjnej (ASA), a przedmiotem oznaczeń były cztery pierwiastki: Mg, Mn, Cr i Zn. Celem było sprawdzenie przenikania jonów metali z hałd żużlu stalowniczego do potencjalnych wód gruntowych i możliwego przez to zanieczyszczenia środowiska naturalnego.

EN

The presented article concerns an examination of the intensity of metal ion leaching in different layers of a steel slag heap originating from a steel mill located in Ostrowiec Świętokrzyski. Leaching was induced by simulating precipitation, using destilled water, and acidic rainwater (nitric acid solution of pH ≈ 2). The samples were collected, on site of factory landfill area of Madrohut company located in Cracow, from both surface layer the heap as well as from the layer around 0.5 m within the heap itself which were all subsequently air-dried for the period of two weeks. Quantification was conducted using the Atomic Absorption Spectrometry method (AAS) within a scope of four metal elements: Mg, Mn, Cr and Zn. The goal was to examine the metal ion leaching from steel slag heap into potential groundwater supply and the possibility of polluting the environment as the result.

7

Wpływ na środowisko wybranych pierwiastków wymywanych z odpadów hutniczych stosowanych do budowy dróg

Krygowska Karolina, Kubek Maria, Ścigaj Justyna

Analit

|

2024

|

Nr 14

29--37

PL

W niniejszej pracy dokonano analizy ilości wymywanych pierwiastków (cynku, magnezu i manganu) jakie mogłyby wydostać się do środowiska z odpadów hutniczych wraz z zastosowaniem ich w budownictwie dróg i nawierzchni asfaltowych. Badanym materiałem były hałdy zawierające żużel stalowniczy, muł z oczyszczania spalin metodą mokrą z oczyszczalni z Dąbrowy Górniczej, świeży żużel oraz żużel po leżakowaniu zlokalizowane na terenie Zakładu Odzysku Surowców Madrohut Sp. Z o.o. w Krakowie. Analizy wymywanych pierwiastków dokonano metodą atomowej spektroskopii absorpcyjnej. Otrzymane wyniki porównano z zawartościami pierwiastków w różnych typach gleb celem określenia czy mogłyby okazać się toksyczne dla ekosystemu w pobliżu dróg. Badania wykazały, że największą zawartością oznaczanych pierwiastków cechują się hałdy z mułu po oczyszczaniu spalin metodą mokrą, natomiast w wielu przypadkach zawartość wybranych pierwiastków była poniżej granicy oznaczalności metodą ASA. Wykazano, że otrzymane wartości zawartości pierwiastków nie powinny stanowić zagrożenia dla środowiska w przypadku zastosowania odpadów jako surowca w budownictwie drogowym.

EN

In the presented paper, the amount of washed out elements (zinc, magnesium and manganese) from metallurgical wastes used for road construction might be released to the environment. The analysed samples were obtained from the wastes heaps containing slug and loam from the exhaust gases purification system in Dąbrowa Górnicza. The waste heaps were localized at site belonging to the Raw Materials Retrieval Company “Madrohut” Sp.Z o.o. in Kraków. The washed out elements’ concentrations were determined by means of Atomic Absorption Spectrometry. The obtained results were compared with the elements’ concentrations in various soils, to determine whether such materials could be toxic for the environment. It can be concluded that the highest concentrations of the elements was found in the loam samples, but in many instances, the elements’ concentrations were below the detection limits. It was shown, that the determined content of the examined elements should not be dangerous for the environment if used in road construction.

8

Effect of fertilisation with P, Mg or S enriched urea-ammonium nitrate solution on the management of macronutrients in common maize

Wierzbowska Jadwiga, Sienkiewicz Stanisław, Światły Arkadiusz

Journal of Water and Land Development

|

2023

|

no. 57

39--51

EN

The purpose of this study has been to determine the effect of fertilisation with urea-ammonium nitrate (UAN) solution enriched with P, Mg or S on the content of macronutrients in the grain and straw of maize. The following fertilisers were tested in the field experiment: ammonium nitrate, urea, UAN - 32% N; RSM+S - 26% N + 3% S; RSM+P(Medium) - 26% N and 4.80% P; RSM+P(Starter) - 21% N and 7.86% P; UAN + Mg - 20% N + 4% Mg. In each year of the experiment, significant differentiation in the contents of P, K, Ca, Mg and S in maize grain and straw was observed, depending on the applied nitrogen fertilisation. However, considering the average values from each treatment achieved over the three years, it was demonstrated that the fertilisation significantly changed only the content of P and S in grain and K and Ca in straw of maize. The removal of nutrients was the highest in the second year of the research and amounted in kg∙ha-1 : P - about 100, K - about 350, Ca - about 80, Mg - about 35 and S - about 31, which in turn were differentiated over the years of the experiment in the three years. The removal of P, K, Mg and S also significantly depended on fertilisation. Significant differences, however, most often concerned the control treatment relative to the fertilised ones. The contribution of grain to the accumulation of nutrients also varied significantly in the three years of the experiment. Significantly the lowest share of grain in terms of P and S accumulation was noted in maize grown without N fertilisation.

9

The Effects of Various Organic Materials on Dactylis glomerata Yield and Content of Selected Macroelements

Malinowska Elżbieta, Wiśniewska-Kadżajan Beata, Ostaszewska Urszula, Horaczek Tomasz

Journal of Ecological Engineering

|

2023

|

Vol. 24, nr 7

108--118

EN

The aim of the experiment was to assess the effects of various organic materials on Dactylis glomerata yield, on the content of selected macroelements (K, Ca and Mg) and on K:Ca, K:Mg and K:(Ca + Mg) ratios. As a valuable forage plant, Dactylis glomerata (cocksfoot grass) is a common grass in Poland both in grassland and in arable fields. Its rapid spring growth and its resistance to drought, low temperatures, but also to frequent mowing and pests, makes it a common species in meadows, pastures and grassland, both permanent and alternating. In order to achieve the research goal, a three-year pot experiment was established in a greenhouse. The experiment was conducted in a completely random design, in four replications. In the autumn before the experiment, soil was mixed with organic materials (chicken manure, mushroom substrate and rye straw) and put into pots. To selected units, an additional amount of mineral N was applied in the first year and NPK fertilizers in consecutive years. Mineral fertilizers were applied at the beginning of the growing period. Compared to control, the application of mineral and organic fertilizers resulted in a significant increase in Dactylis glomerata yield. The highest biomass yield (average over the growing periods) was recorded on the unit treated with manure, straw and mineral fertilizers (27.64 g•pot-1) and on the one with mushroom substrate applied together with rye straw and mineral fertilizers (26.47 g•pot-1). The K:(Ca+Mg) ratio in the forage was normal and averaged 0.933, but mineral fertilizers, compared to other treatments, narrowed it.

10

Impact of Spraying the Shots Parts with Ascorbic Acid on the Concentration of Some Mineral Nutrients in Vicia faba Treated with Heavy Metals

Al-Rashedy Hussein Saber Mohammed Ali, Mame Suzan Othman Omar, Alsinjari Waffaa Esam

Journal of Ecological Engineering

|

2023

|

Vol. 24, nr 6

1--7

EN

This study aimed examine the impact of Ascorbic acid spraying once and twice at concentrations 250 and 500 mg/L on the concentration of some nutrients in the seeds of the bean plant (Vicia faba L.) grown on soils contaminated with nickel at concentrations 30 and 60 and lead at concentrations 300, 600 mg/kg soil.The results showed that soil treated with 600 mg/kg lead has a significant decrease of concentration of magnesium, phosphorous, potassium and chloride in the seeds of the bean plants which amounted to 1.16 , 1.121, 4.113 and 0.071 mg/g, respectively compared to the control group. It was also found that spraying the vegetative parts of the bean plant with 250 mg/L ascorbic acid twice was attributed to increasing of magnesium significantly in the seeds of the bean plant, which amounted to 4.00 mg/g. otherwise, spraying with the same concentration, but once, led to a significant increase in phosphorous concentration, which reached 1.335 mg/g. The results also showed that one-time spraying of 500 mg/L ascorbic acid led to a significant increase in chloride concentration, which amounted to 0.395 mg/g compared to the control group. The results show that lead treatment had a more negative effect on the concentration of nutrients compared to the effect of nickel. It was found that spraying with ascorbic acid at a concentration of 250 mg/L was significantly superior to the concentration of 500 mg/L of magnesium, phosphorous, potassium and chloride in the seeds of bean plants. Also, spraying with ascorbic acid once was superior to spraying twice with the concentration of both magnesium and chloride.

11

Comparative performance assessment of nano-composite cathode of lmso-bscmf for low temperature solid oxide fuel cell applications

Subhashini P.V.C.K., Rajesh K.V.D.

Composites Theory and Practice

|

2023

|

R. 23, nr 4

235--238

EN

The development of novel cathode materials for low temperature solid oxide fuel cell (SOFC) applications is one of the significant research areas in materials engineering. In the current work, composite cathode materials were prepared by two different modes and the fuel cell performance was assessed using a gadolinium-doped ceria (GDC) electrolyte. Nanocomposite cathodes were fabricated using a lanthanum strontium manganite oxide (LSMO) powder of a 50-100 nm particle size and Ba0.5Sr0.5(Co0.2Mg0.8)0.2Fe0.8O3 (BSCMF) powder of a 1 μm particle size. The cathodes were prepared as layered composites and mixed composites. The electrochemical performance of the symmetric cells was investigated by electrochemical impedance spectroscopy (EIS) at the intermediate temperature of 700°C using air atmosphere. The cathode film coating on the electrolyte was sintered at three different temperatures (900, 950 and 1000°C) and the cell performance was assessed at 700°C. Lower polarization resistance (RP) values were recorded for the cell produced at 900°C. The RP of the nano-composite cathodes was measured as lower (2.72 Ω-cm2 for the layered composites and 1.76 Ω-cm2 for the mixed composites) compared with LSMO. Hence, the results demonstrate the potential of using an LSMO-BSCMF composite in the mixed mode as a cathode for low temperature SOFCs to achieve a lower polarization potential.

12

Electrochemical behavior and morphology of selected sintered samples of Mg65Zn30Ca4Pr1 alloy

Hrapkowicz Bartłomiej, Lesz Sabina, Drygała Aleksandra, Karolus Małgorzata, Gołombek Klaudiusz, Babilas Rafał, Popis Julia, Gabryś Adrian, Młynarek-Żak Katarzyna, Garbiec Dariusz

Bulletin of the Polish Academy of Sciences. Technical Sciences

|

2023

|

Vol. 71, nr 3

art. no. e145564

EN

In order to investigate the effect of the milling time on the corrosion resistance of the Mg65Zn30Ca4Pr1 alloy, powders of the alloy were prepared and milled for 13, 20, and 70 hours, respectively. The samples were sintered using spark plasma sintering (SPS) technology at 350◦C and pressure of 50 MPa. The samples were subjected to potentiodynamic immersion tests in Ringer’s solution at 37◦C. The obtained values of Ecorr were –1.36, –1.35, and –1.39 V, with polarization resistance Rp = 144, 189, and 101 Ω for samples milled for 13, 20 and 70 h, respectively. The samples morphology showed cracks and pits, thus signaling pitting corrosion.

13

Additive manufacturing of metallic biomaterials: a concise review

Mahajan Amit, Singh Gurcharan, Devgan Sandeep

Archives of Civil and Mechanical Engineering

|

2023

|

Vol. 23, no. 3

art. no. e187, 2023

EN

Additive manufacturing (AM) is one of the critical techniques of novel medical devices which is capable of processing complicated or customized structures to best match the human’s bones and tissues. AM allows for the fabrication of devices with optimal architectures, complicated morphologies, surface integrity, and regulated porosity and chemical composition. Various AM methods can now consistently fabricate dense products for a range of metallic, nonmetallic, composites, and nanocomposites. Different studies are available that describe the microstructure and various properties of 3D-printed biomedical alloys. However, there are limited research on the wear characteristics, corrosion resistance, and biocompatibility of 3D-printed technology-constructed biomedical alloys. In this article, AM metallic biomaterials such as stainless steel, magnesium, cobalt–chromium, and titanium are reviewed along with their alloys. The helicopter view of essential characteristics of these additively manufactured biomaterials is comprised. The review will have a significant impact on fabricating metallic surgical equipment and its sturdiness in the biomedical field.

14

Investigate the Metallurgical, Degradation Behavior, and Mechanical Characteristics of a Novel Magnesium Alloy

Al Khaqani Baraa H., Dawood Nawal Mohammed

Advances in Science and Technology. Research Journal

|

2023

|

Vol. 17, no. 5

302--312

EN

Today, the use of magnesium alloys in medical applications as a decomposing material is extensive, so a new magnesium alloy Mg-2Al-1Nd was prepared by an investment-casting method in a medium protected from atmospheric oxygen. One of the rare elements, Nd, was added to improve the microstructural and mechanical properties and corrosion resistance in simulated blood plasma media. The XRF test determined the chemical characterization elements, the SEM test was used to identify the distribution of phases and their shape inside the base before and after heat treatment, and the XRD test was conducted to determine the type of phases that formed and the effect of these phases on other properties was studied. Also, hardness was measured using Vickers microhardness, in which the improvement rate was 75%, and a compression test to determine the mechanical properties of the prepared alloy found that the modulus of elasticity was 42GPa.To study its corrosive behavior inside the human body, a test was conducted on corrosion by the Tafel method to measure corrosion resistance in simulated blood plasma solution, Where the value of the corrosion rate of the alloy after the heat treatment became 0.089mm/y and Rp equal 4.13KΩ/cm2, These results made the new magnesium alloy a good candidate for use in temporary medical applications.

15

Asymetryczne reakcje pericykliczne katalizowane kompleksami magnezu

Czombik Anna

Wiadomości Chemiczne

|

2022

|

[Z] 76, 9-10

755--788

EN

II Group-metals, like magnesium, are one of the most widespread elements in the environment. The abundance of II-group metals in the Earth’s crust is over 108 times greater than the precious metals. For the industrial applications, the important factors are the low costs of production and higher accessibility of their compounds. This puts the spotlight on alkaline-earth metals competing with transition elements as catalysts in organic synthesis. Features of their derivatives, like mild Lewis acidity and strong Brønsted basicity enabled them to catalyze reactions where Lewis-acidactivation of the substrate is essential. In this review the emphasis was put on magnesium-catalyzed pericyclic reactions, which are recognized as one of the most important methods of new carbon-carbon or carbon-heteroatom bonds formation. Using the catalysts based on II-group metal cations and chiral ligands, a highly stereoselective conversion of achiral substrates into enantioenriched products is possible. The Mg-based catalysts have been used in Diels-Alder, ene and 1,3-dipolar additions. Described synthesis methods were characterized by high efficiency (chemical yields and enantiomeric excesses). Where applicable, the relationships between the structure of catalyst/substrates, conditions and efficiency were discussed. Just now there are a few applications, for example in synthesis of alkaloid (–)-manzacidine or antibiotic of algal origin – (–)-malyngolide.

16

Fortyfikacja magnezem napojów funkcjonalych

Szymańska Monika, Kręgiel Dorota

Przemysł Spożywczy

|

2022

|

T. 76, nr 4

36--40

PL

W ostatnich 10 latach nastąpił wyraźny wzrost zainteresowania magnezem i formą jego codziennej suplementacji. To zainteresowanie ma uzasadnienie, gdyż magnez jest czwartym, pod względem zawartości, pierwiastkiem ciała człowieka, wykazującym holistyczny wpływ na funkcjonowanie całego organizmu. Niedobór magnezu może powodować nie tylko stany niepokoju, zdenerwowania, lęku, zniecierpliwienia, ale także zwiększać pobudliwość mięśnia sercowego i zaburzać procesy mineralizacji kości. Dlatego suplementacja diety magnezem poprzez lub stosowanie produktów fortyfikowanych, np. napojów funkcjonalnych, może być wygodnym sposobem uzupełnienia niedoborów tego pierwiastka w organizmie człowieka. W artykule dokonano przeglądu literatury dotyczącej magnezu i jego znaczenia dla organizmu człowieka oraz zagadnień związanych z fortyfikacją napojów funkcjonalnych.

EN

In the last decade, there has been a marked increase in interest in magnesium and its daily supplementation. This interest is justified, because magnesium is the fourth element in the human body in terms of content, showing a holistic effect on the functioning of the entire organism. Magnesium deficiency can not only cause anxiety, nervousness, anxiety and impatience, but also increase the excitability of the heart muscle and disrupt bone mineralization processes. Therefore, supplementing the diet with magnesium through or using fortified products, e.g. functional drinks, can be a convenient way to supplement the deficiencies of this element in the human body. The article reviews the literature on magnesium and its importance for the human body as well as issues related to the fortification of functional drinks.

17

Zinc and Magnesium vs COVID-19

Sokołowska Barbara, Nazaruk Stanisława Katarzyna, Radzka-Pogoda Agnieszka, Henrykowska Gabriela, Borzęcki Andrzej

Polish Hyperbaric Research

|

2022

|

nr 2(79)

45--52

EN

Zinc and magnesium are among the most important elements for the human body. A deficiency or excess of either of them may pose a potential threat to the homeostatic mechanisms of the body. Both elements condition the proper functioning of the immune system. Zinc and magnesium deficiency significantly reduces the body's immunity, facilitating infection with various pathogens, including SARS-COV-2 infection. In this paper, we reviewed the literature on the impact of zinc and magnesium deficiencies on the incidence and course of COVID-19.

PL

Cynk i magnez to jedne z ważniejszych pierwiastków dla organizmu człowieka. Niedobór lub nadmiar któregoś z nich może stanowić potencjalne zagrożenie dla mechanizmów homeostazy ustroju. Pierwiastki te warunkują prawidłowe funkcjonowanie układu immunologicznego. Niedobór cynku i magnezu istotnie zmniejsza odporność organizmu ułatwiając infekcje różnymi patogenami, w tym zakażenia SARS-COV-2. W pracy dokonano przeglądu piśmiennictwa obejmującego zagadnienia wpływu niedoborów cynku i magnezu na zachorowanie i przebieg COVID-19.

18

An Analysis of the Features of Cast Composite Materials Based on Light Alloys Reinforced by Particles

Dan Olena

Journal of Casting & Materials Engineering

|

2022

|

Vol. 6, no. 1

8--13

EN

Light alloys are widely used in industry and everyday life due to their high physical and mechanical properties, wear and corrosion resistance, as well as low cost. In this regard, the use of light alloys as a basis for composite materials is both justified and expedient. The potential of these materials has not been fully used to this day, despite the growing interest in metal matrix composites and extensive investigations aimed at the development of production technology and the introduction of advanced systems based on light matrices. The article presents a short review of the analysis of the main components of the technology of cast composite materials based on light alloys of aluminum and magnesium reinforced by particles. Particular attention is paid to the choice of the matrix alloy, the type, size and amount of reinforcing particles introduced into it, as well as the thermal-time and kinetic parameters of the process.

19

The role of β (Al12Mg17) phase on corrosion behavior of the AM90 alloy in NaCl aqueous solution

Hatakeyama Masahiko, Shimada Yusuke, Kawate Naoki, Sarayama Kaede, Sunada Satoshi

Archives of Metallurgy and Materials

|

2022

|

Vol. 67, iss. 2

759--766

EN

The β phase (Al12Mg17) precipitated by heat treatment in some alloy compositions may result deterioration of corrosion resistance. However, much of its role remains unclear. The effect of the β phase on the corrosion resistance behavior in a NaCl solution was presented in this study. The specimen was Mg-9mass%Al (AM90) alloy and the content of the β phase precipitant was controlled systematically by aging time at 473 K. Area rate of β and lamellar phase in the specimens were 0, 10 and 100%, respectively. According to the results of cathodic polarization curves measurement, the corrosion current density of α phase was 0.215 A/m2 and β phase of it was 0.096 A/m2. While, the specimen includes 10% of β and lamellar phase showed large corrosion current density of 0.251 A/m2. Positive correlation between the β phase and the open circuit potential, suggest that the β phase acts as a cathodic electrode. Moreover, the microstructure after postentiostatic corrosion tests was also support the role of β phase.

20

A comparative Study on the Mechanical and Corrosion Properties of the ZM20 and ZM21 Alloys after Casting and Rolling

Gören Halil Ahmet, Ünal Mehmet, Türen Yunus, Ahlatçı Hayrettin, Sun Yavuz

Archives of Metallurgy and Materials

|

2022

|

Vol. 67, iss. 4

1387--1394

EN

In this study, the effects of grain refinement and production methods on the corrosion, corrosive wear and mechanical properties of the as-cast and as-rolled Mg-2 wt.% Zn (ZM20) and Mg-2 wt.% Zn-0,51 wt.% Mn (ZM21) alloys were examined by using OM, XRD, SEM, hardness and uniaxial tensile test. Additionally, the potentiodynamic polarization, immersion corrosion test and corrosive wear properties of the ZM20 and ZM21 alloys were compared. According to the XRD results, MgZn and MgZn2 phases were found in the alloys and also MnZn3 phase occurred in the ZM21 alloy with the addition of manganese. Both during solidification forming nucleation points with the added manganese and during rolling the broken secondary phase particles distributed into the matrix prevented grain growth and led to the formation of a more refined structure. The tensile test results showed that the strength of the as-cast ZM21 alloys were better than that of the as-cast ZM20 alloys and further improvement in mechanical properties occurred with the rolling of the both alloys. The most superior hardness was found in the as-rolled ZM21 alloy. In the total 400-m reciprocal corrosive wear test in the 3.5% NaCl solution, the lowest mass loss was in the as-rolled ZM21 alloys. In the potentiodynamic corrosion test, the highest corrosion resistance was occurred by the as-cast ZM20 alloy.