Green corrosion inhibitors for mild steel in H2SO4 solution: Comparative study of flavonoids extracted from gongronema latifoliunm with crude the extract

Ikeuba, IA; Ita, B. I.; Okafor, Peter C.; Ugi, Benedict U.; Kporokpo, E. B.

doi:10.1134/s2070205115060118

Cited by 46 publications

(40 citation statements)

References 12 publications

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“…From Table 3, it is clearly seen that the charge transfer resistance exhibits an increasing trend with increasing AEOTR and FEOTR concentration up to 2.0 g/L within the range of concentration studied. Similar observation has been reported earlier [11][12][13][14][15] and other workers which was attributed to an increase in heterogeneity resulting from the adsorption of the inhibitors on the steel surface.…”

Section: Eis Resultssupporting

confidence: 91%

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Inhibition Efficiency of Eco-friendly Green Inhibitors (Ocimum tenuiflorum Phytocompounds) on Corrosion of High Carbon Steel in HCl Environment using Thermometric and Electrochemical Methods

Ugi¹,

Obeten²,

Ikeuba³

2018

JAEC

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Corrosion inhibition behavior of crude alkaloids and flavonoids extracts of Ocimum tenuiflorum roots on the corrosion of high carbon steel in hydrogen chloride acid environment was studied using thermometric, electrochemical impedance spectroscopy and potentiodynamic polarization techniques. The phytocompounds showed excellent corrosion retardation ability on the high carbon steel metal in HCl acid environment. The alkaloids demonstrated a more reliable inhibition efficacy compared to flavonoids extracts with maximum inhibition efficiency of 98.1% and 93.6% respectively at a maximum concentration of 2.0 g/L. There was a noticeable increase in inhibition mitigation potential of the inhibitors with increasing concentration of extracts. A physical adsorption mechanism was recorded by the inhibitor and the Langmuir adsorption isotherm was well obeyed with correlation coefficient (R 2) at approximately 0.999. Results of electrochemical impedance spectroscopy and potentiodynamic polarization confirmed the strong adsorption of the inhibitors on the steel surface through the values of charge transfer resistance and corrosion current densities. The inhibitors proved to be stable ones on the metal and a spontaneous reaction process was recorded from the data derived from the Gibbs free energy of adsorption.

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Section: Eis Resultssupporting

confidence: 91%

“…The temperature of the system was varied across the inhibitor concentrations from which the activation energy for the corrosion of high carbon steel in solutions of HCl was evaluated using the Arrhenius equation given by Eq. (3) [11][12][13][14][15].…”

Section: Thermodynamic Propertiesmentioning

confidence: 99%

Inhibition Efficiency of Eco-friendly Green Inhibitors (Ocimum tenuiflorum Phytocompounds) on Corrosion of High Carbon Steel in HCl Environment using Thermometric and Electrochemical Methods

Ugi¹,

Obeten²,

Ikeuba³

2018

JAEC

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“…These results are in agree with that reported by Samaha et al [29]. Flavonoids have been reported to be present in effective green corrosion inhibitors [30][31][32]. The corrosion inhibition activity of flavonoids could be due to presence of electron rich multiple bonds and heteroatoms [33,34].…”

Section: Characterization Of J Procera Leaf Extractsupporting

confidence: 92%

Effect of Acid Extract of Leaves of Juniperus procera on Corrosion Inhibition of Carbon Steel in HCl Solutions

Ali¹

2018

International Journal of Electrochemical Science

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The efficiency of the hydrochloric acid leaf extract of Juniperus procera as a corrosion inhibitor against C-steel and its adsorption behavior were investigated in 1.0 M HCl solution using mass loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) techniques. Results revealed that the inhibition efficiency increased with the inhibitor concentration. EIS spectra exhibited one capacitive loop and confirmed the inhibitive capacity. The activation energy (E a ) of the corrosion process clearly increased when the extract was used. The leaf extract was found to act as mixed-type inhibitor. The inhibition properties of the extract are discussed in terms of the mechanism by which its components adsorb onto the C-steel surface. This adsorption process obeyed a Langmuir adsorption isotherm.

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“…This implies that the activation complex in the rate determining step represents association rather than dissolution step, meaning that a decrease in disordering takes place on going from reactants to the activated complex. The negative value for entropy also indicates the non-spontaneous nature of the dissolution as a result of the addition of the inhibitors [23] [24] [25].…”

Section: Activation Parametersmentioning

confidence: 99%

Mild Steel Corrosion Mitigation in Sulphuric Acid via Benign Isolated Phytochemicals from <I>Viscum album</I>

Nya¹,

Ikeuba²,

Okafor³

et al. 2018

MSCE

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We present the evaluation of four Eco-friendly corrosion inhibitors for the corrosion mitigation of mild steel in acid media. The corrosion inhibition of mild steel by ethanol extracts from Viscum album (EEVA) and some of its isolated phytochemical components; phytates extract (PEVA), saponins extract (SEVA), and flavonoids extracts (FEVA) have been studied using gravimetric and gasometric techniques. The results of the study reveal that these ecofriendly and benign extracts function as good inhibitors for mild steel corrosion in sulphuric acid. Inhibition efficiency of the extracts increases with inhibitor concentration and temperature rise. The trend of inhibition efficiency in lower inhibitor concentration is EEVA > PEVA > SEVA > FEVA and at higher concentration, the order was SEVA > PEVA > EEVA > FEVA. The presence of the plant extracts decreases the corrosion activation energy in the solution which indicates chemical adsorption mechanism. The adsorption of the components of the extracts is consistent with Temkin isotherm. The interaction between the isolated extracts is synergistic at lower inhibitor concentration and antagonistic at higher concentrations. The K ads values for PEVA and SEVA are higher than those of EEVA and FEVA. This implies that PEVA and SEVA are more efficiently adsorbed on the mild steel surface.

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Green corrosion inhibitors for mild steel in H2SO4 solution: Comparative study of flavonoids extracted from gongronema latifoliunm with crude the extract

Cited by 46 publications

References 12 publications

Inhibition Efficiency of Eco-friendly Green Inhibitors (Ocimum tenuiflorum Phytocompounds) on Corrosion of High Carbon Steel in HCl Environment using Thermometric and Electrochemical Methods

Inhibition Efficiency of Eco-friendly Green Inhibitors (Ocimum tenuiflorum Phytocompounds) on Corrosion of High Carbon Steel in HCl Environment using Thermometric and Electrochemical Methods

Effect of Acid Extract of Leaves of Juniperus procera on Corrosion Inhibition of Carbon Steel in HCl Solutions

Mild Steel Corrosion Mitigation in Sulphuric Acid via Benign Isolated Phytochemicals from <I>Viscum album</I>

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Green corrosion inhibitors for mild steel in H2SO4 solution: Comparative study of flavonoids extracted from gongronema latifoliunm with crude the extract

Cited by 46 publications

References 12 publications

Inhibition Efficiency of Eco-friendly Green Inhibitors (Ocimum tenuiflorum Phytocompounds) on Corrosion of High Carbon Steel in HCl Environment using Thermometric and Electrochemical Methods

Inhibition Efficiency of Eco-friendly Green Inhibitors (Ocimum tenuiflorum Phytocompounds) on Corrosion of High Carbon Steel in HCl Environment using Thermometric and Electrochemical Methods

Effect of Acid Extract of Leaves of Juniperus procera on Corrosion Inhibition of Carbon Steel in HCl Solutions

Mild Steel Corrosion Mitigation in Sulphuric Acid via Benign Isolated Phytochemicals from &lt;I&gt;Viscum album&lt;/I&gt;

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Mild Steel Corrosion Mitigation in Sulphuric Acid via Benign Isolated Phytochemicals from <I>Viscum album</I>