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    Wyświetlanie 1-5 z 5
    Tytuł:
    Corrosion inhibition potential of Terminalia avicennioides extract on mild steel in 1.0 M HCl: kinetics, thermodynamics and synergestic studies
    Autorzy:
    Ijuo, G. A.
    Surma, N.
    Oloruntoba, S. O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1177459.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Terminalia avicennioides
    inhibition efficiency
    physisorption
    synergestic effect
    Opis:
    The corrosion inhibition effect of Terminalia avicennioides (TA) stem extract in 1.0 M HCl solution was investigated using weight loss and electrochemical method. The operation variables considered include temperature (303-333 K) and concentration of the inhibitor (0.2 - 1.0 g/L). Inhibition efficiency increased from 21.88% to 88.71% with concentration but decreased with rise in temperature which is suggestive of physisorption. This was supported by the values of activation energies (Ea) obtained ranging from 22.67 KJ mol−1 to 60.67 KJ mol−1 which was lower than 80 KJ mol−1. The values of Gibb’s free energy of adsorption (∆Gads) indicated that the adsorption of the inhibitor on mild steel surface was a spontaneous process. The Kinetic treatment of the data followed a pseudo-first order reaction while the positive values obtained for enthalpy and entropy of activation is reflective of endothermic reaction nature and associative activation complex respectively. The adsorption mechanism followed the Langmuir adsorption isotherm model. Electrochemical analysis showed that the inhibitor functioned as a mixed type inhibitor. The inhibition efficiency of the inhibitor was found to be enhanced by the presence of KI. Therefore the extract functioned as good corrosion inhibitor for mild steel in 1.0 M HCl.
    Źródło:
    World Scientific News; 2018, 102; 1-16
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization and optimization study of Ficus exasperata extract as corrosion inhibitor for mild steel in seawater
    Autorzy:
    Oyewole, O.
    Aondoakaa, E.
    Abayomi, T. S.
    Ogundipe, S. J.
    Oshin, T. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031411.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Corrosion
    Ficus exasperata
    inhibition efficiency
    optimization
    weight loss
    Opis:
    This study investigated the characterization of Ficus exasperata extract and the optimization of the process variables on inhibition of mild steel in seawater environment. Box Behnken Design was employed to examine the influence of three process variables: Temperature: 25-29 °C; Time: 3 – 6 days; Inhibitor concentration: 1-5 v/v. Phytochemical screening of the extract was done. The physicochemical constituents of the seawater were also determined. The experimental data was statistically determined and Scanning Electron Microscope (SEM) was used to characterize the mild steel. The result of the phytochemical screening of the Ficus exasperata plant extract (FEPE) showed the presence of contain inhibitive constituents: alkaloids, tannins, saponins, flavonoids and glycosides. The highest inhibition efficiency of 86.31% at a temperature of 29 ℃ for 6days at an inhibition concentration of 3v/v was observed from the experimental run. The optimal process levels of time: 5.74 days, temperature: 27.95 ℃ and inhibitor concentration: 2.90v/v, gave 87.52% as its inhibition efficiency. The result of the SEM from the optimal process level validated showed that more passive film was formed which can be attributed to the adsorption of the Ficus exasperata extract. It can be concluded that the Ficus exasperata was a good eco-friendly inhibitor.
    Źródło:
    World Scientific News; 2021, 151; 78-94
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of Some Inorganic Anions and Organic Compounds as Corrosion Inhibitors of Cu-Zn Alloys in H2SO4 and HNO3 Solutions
    Autorzy:
    Ahmed, Amal S. I.
    Ghanem, Wafaa A.
    Hussein, Walaa A.
    Gaber, Ghalia A.
    Powiązania:
    https://bibliotekanauki.pl/articles/351226.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Cu-Zn alloys
    oxy-acid solution
    inhibition efficiency
    inorganic anions
    organic compounds
    Opis:
    Evaluation of inorganic and organic compounds as corrosion inhibitors of Cu-Zn alloys in H2 SO4 and HNO3 solutions was studied using potentiodynamic and impedance spectroscopy along with scanning electron microscope (SEM) and energy dispersive X-Ray analyzer (EDX) investigations. The corrosion inhibition of Cu-Zn alloys was investigated in oxy acid solutions using inorganic potassium permanganate and di-hydrogen phosphate, amino acids as environmentally safe materials, commercial cooling water, and green tea extracts. Both potassium permanganate and di-hydrogen phosphate improve the corrosion resistance of Cu-Zn alloys. Phosphate appears more effective as corrosion inhibitor for Cu-Zn alloys than permanganate. The inhibition efficiency (IE%) of the different amino acids such as valine, leucine and lysine was also calculated. The experimental results have shown that amino acid-like lysine can be used as an efficient corrosion inhibitor for the Cu-Zn alloys in oxy acid solutions. This may be due to the presence of two amino groups adsorbed together. For lysine, inhibition efficiency, IE%, of ~87 and ~59 is for H2SO4 and ~96.3 and 54.9 for HNO3 for alloy I and II respectively are observed. Due to the composition of green water have a great effect on the inhibition action on Cu-Zn alloys which reaching 91.8 and 96.5% for Alloy I and 95.4 and 87.1% for Alloy II in 0.5 M H2 SO4 and HNO3 respectively. Although benzotriazole, in cooling water, is an excellent inhibitor suitable for use in a wide variety of environments, it has toxic properties. So, much of the recent researches have focused on formulating new and more environmentally acceptable preservation solutions. The green tea, as plant extract, will be very environmentally friendly. The EDX confirm the formation of a protective layer on the Cu-Zn alloys containing aluminum in Alloy II. This sequence reflects the beneficial effects of Al in Alloy II. The presence of 2.43% Al in Alloy II improves the corrosion resistance due to the formation of thin, transparent, stable and self-healing Al2 O3 layer. This confirmed the results obtained from the potentiodynamic polarization measurements and EIS methods.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 2; 639-651
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molibdenian(VI) sodu jako inhibitor korozji stali węglowej
    Sodium molybdate(VI) as a corrosion inhibitr of carbon steel
    Autorzy:
    Trela, J.
    Scendo, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/134674.pdf
    Data publikacji:
    2015
    Wydawca:
    ADVSEO
    Tematy:
    molibdenian sodu (VI)
    stal węglowa
    korozja
    sodium molybdate(VI)
    carbon steel
    inhibition efficiency
    Opis:
    The influence of the concentration of sodium molybdate(VI) on the corrosion of S235 carbon steel in solutions contained chloride and nitrate(V) ions have been studied. For the research purpose a weight loss method has been used. It can be concluded that the addition of Na2MoO4 to the aggressive environment reduces the weight loss of the sample. Inhibition efficiency and corrosion rate have been calculated. The efficiency inhibition of corrosion has been about 93%. It has been found that the corrosion rate of S235 steel, in a solution containing 100 mM sodium molybdate (VI) was about 14 times lower than in the solution without inhibitor. Therefore, the examined compound was an effective inhibitor of the corrosion of S235 carbon steel.
    Źródło:
    Technical Issues; 2015, 2; 47-53
    2392-3954
    Pojawia się w:
    Technical Issues
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ molibdenianu (VI) sodu na korozję stali węglowej
    Influence of sodium molybdate (VI) on the corrosion of S235 carbon steel
    Autorzy:
    Trela, J.
    Chat, M.
    Scendo, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/142606.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
    Tematy:
    molibdenian(VI) sodu
    stal węglowa
    wydajność inhibitowania
    adsorpcja
    sodium molybdate(VI)
    carbon steel
    inhibition efficiency
    adsorption
    Opis:
    Zbadano wpływ stężenia molibdenianu (VI) sodu na korozję elektrochemiczną stali węglowej S235 w kwaśnych roztworach zawierających jony chlorków i azotanowe (V). Na podstawie przeprowadzonych badań wyznaczono parametry: szybkość oraz wydajność inhibitowania reakcji korozji stali. Stwierdzono, że szybkość korozji stali, S235 w roztworze zawierającym 100 mM molibdenianu (VI) sodu jest ok. 18 razy mniejsza niż w roztworze elektrolitu podstawowego. Wydajność inhibitowania reakcji korozji jest wysoka i wynosi 95%. Zatem badany związek jest skutecznym inhibitorem korozji stali węglowej S235.
    The influence of the concentration of sodium molybdate (VI) on the corrosion of S235 carbon steel in solutions contained chloride and nitrate (V) ions were studied. Corrosion parameters, inhibition efficiency and corrosion rate were calculated. The efficiency inhibition of corrosion was about 95%. It was found that the corrosion rate of S235 steel, in a solution containing 100 mM sodium molybdate (VI) was about 18 times less than in the solution without inhibitor. Therefore, the examinated compound was an effective inhibitor of the corrosion of S235 carbon steel.
    Źródło:
    Chemik; 2015, 69, 9; 592-599
    0009-2886
    Pojawia się w:
    Chemik
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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