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    Wyświetlanie 1-3 z 3
    Tytuł:
    Plant extract as biodegradable inhibitor for zinc in dilute solution of sulphuric acid
    Autorzy:
    Onukwuli, O. D.
    Ezeugo, J. O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1163555.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Picralima nitida leaf
    Zinc
    corrosion
    inhibition
    inhibitor
    Opis:
    The inhibitive action of the ethanol extract of oil from Picralima nitida leaf, towards acid corrosion of zinc, is tested using weight loss, and thermometry methods. It was found that the extract acted as a good corrosion inhibitor for zinc corrosion in 0.5 M H2SO4 solution. The inhibitive action of the extract was discussed in view of Langmuir adsorption isotherm. It was revealed that the adsorption of the extract on zinc surface is governed by spontaneous process. The inhibition efficiency (IE) increases in line with corresponding increase in extract concentration. The temperature effect of the corrosion inhibition on the IE was studied. Revelation from the studies indicates that the presence of extract increases the activation energy of the corrosion reaction. Furthermore, from the calculated thermodynamic parameters, it was observed that Picralima nitida extract provides a good protection to zinc against pitting corrosion in chloride ion containing solutions.
    Źródło:
    World Scientific News; 2018, 109; 195-210
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization and Optimization study of Epiphyllum oxypetalum extract as corrosion inhibitor for mild steel in 3 M H2SO4 solutions
    Autorzy:
    Emembolu, L. N.
    Onukwuli, O. D.
    Okafor, V. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030954.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Acid corrosion
    Epiphyllum oxypetalum extract
    Optimization
    Photochemical
    Response Surface Methodology
    Opis:
    This study investigated characterization of Epiphyllum oxypetalum (EO) leaf extracts and optimization of process variables on inhibition of mild-steel in 3 M H2SO4 aggressive environment. Response Surface Methodology (RSM) was employed to examine the influence of process variables namely acid concentration (1.0 – 3.0 mols), inhibitor concentration (0.2 – 1.0 g/l), time (1–10 hr) and temperature (303 -343K) on inhibition efficiency. The results of phytochemical screening showed that organic components present in EO extract as a good inhibitor. Fourier transform infrared spectroscopy (FTIR) and Scanning electron microscopy (SEM) studies established the presence of active compounds and adsorption of leaf extracts on metal surface. The experimental data was statistically analyzed and regression equations for corrosion rate and inhibition efficiency generated. The optimum conditions were achieved at acid concentration of 1.00 mol, inhibitor concentration of 0.055 g/l temperature of 333K, and time of 2.750 hr. The optimization results revealed that inhibition efficiency of 82.93 % was obtained at optimum combination of the extract concentration, the acid concentration, the temperature and the immersion time. The inhibitive potentials of EO extract was found to impede the localized and uniform corrosion of mild steel in acidic media, showing that the Epiphyllum oxypetalum leaf extract is a good inhibitor for mild steel in acidic solutions.
    Źródło:
    World Scientific News; 2020, 145; 256-273
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of Chrysophyllum albidum leaf extract as corrosion inhibitor for aluminium in 0.5 M H2SO4
    Autorzy:
    Ezeugo, J. O.
    Onukwuli, O. D.
    Ikebudu, K. O.
    Ezechukwu, V. C.
    Nwaeto, L. O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1075618.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Aluminium
    Chrysophyllum albidum
    corrosion
    electrochemical
    optimal
    Opis:
    Inhibition of Chrysophyllum albidum leave (CAL) extract toward 0.5 M H2SO4 corrosion of aluminium was optimized applying response surface methodology. Corrosion analysis was carried out using weight loss and electrochemical techniques. The results of the various analyses of the leave extracts acted as a good corrosion inhibitor for aluminium in 0.5 M H2SO4. Inhibition efficiency increases as the extract concentration increased. Results of molecular dynamic simulations of the active constituents of the extracts confirmed the adsorption potentials of the ethanol extracts of CAL. Optimal inhibition efficiency of 78.43(%) was obtained at optimum inhibitor concentration of 1.00 g/l, 11.71hs and temperature of 303.60k
    Źródło:
    World Scientific News; 2019, 125; 32-50
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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