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Gravimetric study of corrosion inhibition of mild steel in H2SO4 environment using watermelon (Citrullus lanatus (Thunb.) Matsum. & Nakai) leaf extract as inhibitor

100%
Monday O., Tony G. B., Okorie O., Azuka E. J., Ogechukwu A. S.
World News of Natural Sciences
|
2024
|
vol. 53
17-31
EN
ABSTRACT This work presents gravimetric study of corrosion inhibition of mild steel in H2SO4 environment using watermelon (Citrullus lanatus) leaf extract as inhibitor. The extract was characterized in terms of phytochemical status and functional groups. Its efficiency in the corrosion inhibition was optimized using response surface methodology (RSM). In the RSM, interactive effects of inhibitor concentration, temperature and time on the efficiency of the extract were monitored using central composite design of design expert software. Analysis of the results show that watermelon leaf extract successfully inhibited corrosion of mild steel in H2SO4 environment. Predominant functional groups of watermelon leaf include; C-H stretch (2851.4 cm-1), N-H symmetric and asymmetric stretch (3267.7 cm-1), C=H stretch (2195.4 cm-1), =C-O-C stretch (1241.2 cm-1), C=O symmetric and asymmetric stretch (17722.0 cm-1), C-F (1155.5 cm-1) and =C-H bend (674.0 cm-1). It contains polar atoms of nitrogen and oxygen. Its major phytochemicals are alkaloids (243.14 ±0.03 mg/100g) and tannins (216.32 ±0.02 mg/100g). The extract possesses good inhibitive properties. Weight loss, corrosion rate, inhibition efficiency and degree of surface coverage were influenced by time of immersion of the mild steel, temperature and concentration. The watermelon leaf extract exhibited high inhibition efficiency. Hence, it can be used to inhibit corrosion of mild steel in H2SO4 solution. Quadratic equation reliably connects the inhibition efficiency with the considered factors. Optimum Inhibition efficiency of 92.96% was attained by the watermelon leaf extract.
2
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Quinine sulfate: a pharmaceutical product as effective corrosion inhibitor for carbon steel in hydrochloric acid solution

88%
Samide A., Tutunaru B.
Open Chemistry
|
2014
|
vol. 12
|
issue 9
901-908
EN
Quinine sulfate dihydrate (QNS), IUPAC name: (8S,9R)-6-methoxy-4-quinolenyl-5-vinyl-2-quinuclidinyl methanol sulfate dihydrate, was tested as corrosion inhibitor for carbon steel in 1.5 mol L−1 HCl solution using the potentiodynamic polarization and the electrochemical impedance spectroscopy (EIS) associated with UV-Vis spectrophotometry. The electrochemical results showed that, the inhibition efficiency (IE) increased with the increase in QNS concentration, reaching a maximum value of 93.35±0.25%. The polarization resistance (R p) followed the same trend, obtaining the highest value of 659.7 Ω cm2, while the corrosion current density (i corr) reached the lowest level of 195 µA cm−2. The action mechanism of QNS was proposed considering the ability of quinine (QN) to be adsorbed on the metal surface via the lone pairs of electrons from hydroxyl oxygen atom, and/or from quinoline and quinuclidinic nitrogens. The occurrence of the complexes between inhibitor and iron ions was considered an additional process, which may contribute to protective layer formation. The Temkin adsorption isotherm was found as the best fitting for the degree of surface coverage (θ) values. In order to elucidate the mechanism of protective layer formation, the free energy of adsorption (ΔG o ads) value was calculated. This indicates that the inhibitor acts by chemical adsorption on the steel surface.
3
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Retarding Carbon Steel Dissolution in Oil Well Acidizing Solution using Leave Extracts of Evolvulus alsinoides (Linn.) Linn. [Family: Convolvulaceae]

75%
Iroha N. B.
World News of Natural Sciences
|
2023
|
vol. 50
1-10
EN
The corrosion inhibition performances of leave extracts of Evolvulus alsinoideson (EA) X70 carbon steel in 5% HCl was investigated using weight loss and surface analysis. Weight loss measurement showed that this leave extract has high inhibiting properties for X70 steel corrosion in acidic solution and the inhibition efficiency increased with the increase in inhibitor concentration. The inhibitive action of plant extract is discussed on the basis of adsorption of stable complex at the X70 steel surface. Adsorption of EA on the X70 steel surface in 5% HCl obeys the Langmuir adsorption isotherm. Gibbs free energy of adsorption was calculated and indicated that adsorption occurred through physical and spontaneous process. Scanning electron microscopy (SEM) of the inhibitor-adsorbed steel surface affirmed the adsorption of inhibitor and improvement in the surface smoothness of the X70 steel.
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