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    Wyświetlanie 1-2 z 2
    Tytuł:
    Fabrication, Characterization, and Corrosion Protection of Hot Dip Aluminized Coatings for Steel Using Discarded Soda Cans
    Autorzy:
    Hernandez, Jan Cedric M.
    Ureta, Romnick M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1164111.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Aluminium coating
    Corrosion
    Solid waste management
    Opis:
    Corrosion which seriously affects the quality and functionality of steel can be reduced by hot dip aluminizing which involves dipping substrate to a molten aluminum bath. Thus, this study aimed to produce hot dip aluminized coating for steel using discarded soda cans. A total of 80 steel nails with length of 65.62±0.56 mm were used wherein 40 nails were intended for the hot dip aluminizing process at 650-700 °C with an average coating mass and thickness of 547 g/m2 and 170 μm, respectively, with density of 2.627 g/cm3 following ASTM standards. Compared to the non-coated setups, the fabricated aluminum coating reduced 0.178g and 0.092g of corrosion products accumulation after immersions on H2O2 and NaCl solutions for 7 days and 4 weeks, respectively. Optical analysis of surface and cross sections of the coated samples showed less pitting, and corrosion products. Aluminum coating tends to pit that starts from small cracks and fractures when immersed in corrosive medium. Moreover, scanning electron microscopy showed that the coated nail sample experienced minimal corrosion in the form of thin cracks compared to non-coated nails which had relatively rough surface as result of heavy corrosion. In addition, t-test showed significant difference between the accumulated corrosion products’ weights of coated and non-coated setups after immersing in NaCl (t = -13.801; p = 0.000) and H2O2 (t = -31.005; p = 0.000) wherein less corrosion product was obtained by the coated set-up (x̅ = 0.036 (H2O2) and x̅ = 0.028 (NaCl)). Thus, the results proved that the produced aluminized coating from waste soda cans provides a significant corrosion protection on the steel substrates.
    Źródło:
    World Scientific News; 2018, 108; 158-179
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Potential of Selected Agricultural Wastes Fibers as Acoustic Absorber and Thermal Insulator Based on their Surface Morphology via Scanning Electron Microscopy
    Autorzy:
    Mercado, Ricky Dave T.
    Ureta, Romnick M.
    Templo, Reynan Jay D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1109605.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Agricultural wastes fibers
    Analytical imaging
    Banana pseudustem
    Coconut husk
    Recycling
    SEM
    Sugarcane husk
    Surface morphology
    Opis:
    Natural fibrous materials have been studied to address noise and high heat indices, but many of the existing studies about natural fibers do not sufficiently support their claims of better acoustical and heat insulating materials. Thus, this study investigated the surface morphology of easily available agricultural materials such as coconut husks, banana pseudostem and sugarcane husk for their potential as sound absorbers and thermal insulators. Fiber pads from the materials were constructed and analyzed for noise reduction coefficients, thermal insulating performance, water absorbing capacity and flame tolerance - using the methods specified in the American Society for Testing Materials. Herein, scanning electron microscopy (SEM) was applied for analytical imaging of the agricultural materials. Noise reduction coefficients (0.80 dB and 0.92 dB), (0.75d B and 0.78 dB) and (0.50 dB and 0.35 dB) each at 800 Hz and 440 Hz, and heat reductions of 2.56 °C, 1.71 °C, and 1.24 °C were obtained from coconut husk, sugarcane husk and banana pseudostem, respectively. The coconut husk also gave the highest water absorbing capacity and high flame tolerance of 56%, compared to that of sugarcane husk (49%) and banana pseudostem (32.67%). The morphology of the coconut husk, after SEM application revealed more diverse microporous cells with varying shapes and sizes compared to that of sugarcane husk and banana pseudostem. Thus, results indicate that porosity affects the noise and heat reduction indices of the fibers. The more porous the material is, the better its potential as sound absorber and thermal insulator.
    Źródło:
    World News of Natural Sciences; 2018, 20; 129-147
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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