Electrochemical and statistical study of the inhibition effect of T. conophorum leaf extract on aluminum corrosion in acidic medium

Emembolu, Loveth Nwanneka; Aniagor, Chukwunonso O.; Umembamalu, Josiah C.; Onyenanu, C. N.

doi:10.1007/s42797-021-00040-2

Cited by 6 publications

(3 citation statements)

References 31 publications

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“…Again, the values of the slopes Table 3 affirms that the inhibitor molecules were adsorbed on the MS surface in accordance with Langmuir adsorption model. The obtained Kads values implied that B. eurycoma leaves extracts has high adsorption capability for the metal surface, that is, the better the Kads, the tougher and more efficient the adsorbed layer on the steel surface and the greater the surface coverage [19]. The adsorption process of the B. eurycoma leaves extracts on the metal surface can be promising as disclosed by the negative values of ∆Gads as well as its workability and spontaneous nature.…”

Section: Adsorption Isotherm Considerationsmentioning

confidence: 91%

“…The EIS results were obtained over a frequency range of 0.01Hz to 10 kHz with 10mV amplitude. The equations (1) and (2) were used in the calculating the corrosion inhibition efficiency based on polarization (ηpolarization) and EIS (𝜂 𝐸𝐼𝑆 ) results [19]:…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

“…Furthermore, B. eurycoma leaves extract can be seen as a group of heterocyclic compounds comprising of one or more heteroatoms, aromatic rings and polar functional groups. Also, the capability as H-bond acceptors and donors, and the π-conjugated molecular structure of the extracted inhibitors adds to the strength of organic layers development during adsorption on the mild steel (MS) surfaces [19][20][21][22]. The behavioral performance of B. eurycoma leaves extract was evaluated in this current work using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP) studies.…”

Section: Introductionmentioning

confidence: 99%

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Corrosion Inhibition Performance of Brachystegia eurycoma Leaf Extract on Mild Steel in Acid Media

Emembolu,

Iwuchukwu,

Ejiofor

et al. 2024

JERR

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The aim of this work is to investigate the corrosion inhibition of B. eurycoma leaves extract as a natural inhibitor for mild steel corrosion in 3 M H2SO4 solution. The corrosion inhibitory activity was analyzed by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. The surface roughness and its properties through scanning electron microscopy (SEM). The obtained result from EIS divulges that the gradual increase in inhibitor concentration and time of immersion leads to progressive increase in inhibition efficiency. At the end of 8 hours immersion time and inhibitor concentration of 1000 mg/l the highest inhibition efficiency of (88%) was obtained. The potentiodynamic polarization results indicated that addition of B. eurycoma leaves extracts hindered the reaction rates of anodic and cathodic reactions thereby performing as mixed- type inhibitor. The corrosion current density also revealed that in the presence of B. eurycoma leaves extracts the value of corrosion density reduced considerably from 265.2 \(\mu\) A/cm2 for sample without inhibitor to 67.8 \(\mu\) A/cm2 for sample with inhibitor. Again, it was observed that in the presence B. eurycoma leaves extracts the mechanism of hydrogen (effervescence) evolution was unique whereas the anodic dissolution of iron mechanism experienced the impact of the inhibitor. SEM inspection revealed that the mild steel surface showed smoother and lower damage in the presence of inhibitor. Obvious correlations were found between corrosion inhibition efﬁciency and some quantum chemical parameters such as energy of highest occupied molecular orbital (EHOMO), energy of lowest unoccupied molecular orbital (ELUMO), energy gap (EL–H) and electronic density etc. The obtained results were further elucidated with frontier molecular orbital theory.

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Section: Adsorption Isotherm Considerationsmentioning

confidence: 91%

Section: Electrochemical Measurementsmentioning

confidence: 99%