Structural & Engineering Materials
Rajni Narang; Priya Vashishth; Himanshi Bairagi; Rashmi Sehrawat; Sudhish K. Shukla; Bindu Mangla
Abstract
This review highlights the overview of recent trends in the usage of drugs as corrosion inhibitor for metal/alloy surfaces, particularly mild steel, aluminum, and copper in acidic, basic, or saline medium. The drug molecules generally containing atom having lone pair of electrons such as nitrogen (N), ...
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This review highlights the overview of recent trends in the usage of drugs as corrosion inhibitor for metal/alloy surfaces, particularly mild steel, aluminum, and copper in acidic, basic, or saline medium. The drug molecules generally containing atom having lone pair of electrons such as nitrogen (N), oxygen (O), Sulphur (S) and phosphorus (P) as well as a hydrophobic moiety that will repel aqueous corrosive species away from the metal surface and a mediately with an aromatic ring, unsaturation that are observed to be a significant component of extremely efficient inhibitors. The efficacy of various drugs, including antipyretics, analgesics, antibiotics, anti-depressants, and anti-histamines, is studied using weight loss, electrochemical impedance spectroscopy, potentiodynamic polarization and surface analysis techniques. Drugs molecules work by producing a layer on the metal's surface and can serve as anodic, cathodic, or mixed inhibitors. This protective film formed results of strong interactions such as free- orbital adsorption, chemisorption, and electrostatic adsorption, which prevent corrosive species from attacking the metal surface. Recent concerns and future prospective for further research and development to achieve more efficient and environmentally friendly inhibitors are additionally highlighted.
Composite Materials
Viktor Gribniak
Abstract
The modern industry allows producing composite materials with a broad spectrum of mechanical properties applicable in medicine, aviation, and automotive industries. However, the building industry generates a substantial part of budgets worldwide and utilizes vast material amounts. At the same time, the ...
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The modern industry allows producing composite materials with a broad spectrum of mechanical properties applicable in medicine, aviation, and automotive industries. However, the building industry generates a substantial part of budgets worldwide and utilizes vast material amounts. At the same time, the engineering practice has revealed that innovative technologies require new design concepts related to developing materials with mechanical properties tailored for structural purposes. It is the opposite of the current design philosophy when design solutions allow applying only the existing typical materials, the physical characteristics of which, in general, are imperfectly suiting the technical requirements, leading to an inefficient increase of the material amounts for safety’s sake. Moreover, some structural solutions are barely possible using standardized approaches. The “Industrialised material-oriented engineering for eco-optimized structures” research project supported by the European Regional Development Fund inspired this article’s emergence, which adapts the Award lecture at the European Advanced Material Congress 2022 in Genoa. It summarizes the project results and illustrates the implementation of the proposed adaptive design concept.
Experimental Techniques
Beata Stankiewicz
Abstract
Depending on the type of the load which affects the durability and design life glass fibre reinforced polymer (GFRP) structures should be designed so as to take into account as first of all the chemical-physical conditions in which the structure is used including: ultraviolet (UV) radiation, temperature ...
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Depending on the type of the load which affects the durability and design life glass fibre reinforced polymer (GFRP) structures should be designed so as to take into account as first of all the chemical-physical conditions in which the structure is used including: ultraviolet (UV) radiation, temperature influences, humidity, water and chemicals. The results presented herein provide a predictions regarding of the mechanisms involved in the ageing of GFRP pultruded bridge profiles and predicting the property micro scale changes with time and remaining service life of GFRP under real environmental degradation impacts and during simulation laboratory conditions. The outermost layers of FRP (fibre reinforced polymer) composites are damaged mostly because of UV radiation. Radiation also induces remarkable microstructural changes depending on wavelength and intensity, and oxygen availability, eventually leading to polymer chain scission. A scanning electron microscope (SEM) was used to investigate the degradation mechanism of the GFRP samples subjected among others to UV radiation and water vapor condensation. Glass fibre-reinforced polymer GFRP pultruded profiles have great potential in the construction industry, presenting several advantages comparing with traditional materials, among which, the potentially improved durability under environmental influents.
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