Exploiting the Anticorrosion Effects of Vernonia Amygdalina Extract for Protection of Mild Steel in Acidic Environments

Adindu, Blessing; Ogukwe, Cynthia E.; Eze, F. C.; Oguzie, Emeka E.

doi:10.5229/jecst.2016.7.4.251

Cited by 3 publications

(3 citation statements)

References 46 publications

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“…The corrosion potential was also shifted slightly towards the negative value by the inhibitor, all these indicate that the extract inhibited the corrosion of mild steel in the solutions studied in line with the results reported elsewhere [31]. The inhibition effieciency was estimated from the polarization data by comparing the corrosion current density in the uninhibited solution (i corr,inh ) and the corrosion current density in the presence of the inhibitor(i corr,bl ) as follows: [32] IE (%) = ( i corr,bl −i corr,inh i corr,bl ) × 100 (4).…”

Section: (A) Electrochemical Impedance Spectroscopy (Eis) Resultssupporting

confidence: 85%

Determination of the corrosion inhibiting properties of ethanol extract of Pennisetum purpureum in acidic solutions

Adindu

2023

IJRSI

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The corrosion inhibition of mild steel by leave extract of Pennisetum purpureum (PP) in 1 M HCl and H_2 SO_4 was studied using gravimetric, electrochemical and computer simulation methods of corrosion monitoring. The results obtained showed that the PP extract retarded the mild steel corrosion in both acidic solutions and that inhibition efficiency improved with concentration increase but decreased gradually with prolonged exposure time. Electrochemical results revealed that the extract reduced both the anodic and cathodic corrosion reactions by the adsorption of some of its chemical constituents on the metal surface. To further confirm the adsorption characteristics of the extract, some of its constituents were simulated using density functional theory simulation method.

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Section: (A) Electrochemical Impedance Spectroscopy (Eis) Resultssupporting

confidence: 85%

Determination of the corrosion inhibiting properties of ethanol extract of Pennisetum purpureum in acidic solutions

Adindu

2023

IJRSI

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“…The measurements were performed at the end of 1800 secs in an aerated environment and stagnant test solution. Polarization curves were determined from the scanning electrode potential of -250 mV to +250 mV versus corrosion potential (Ecorr) at a scan rate of 0.33 mV/s [29] while linear polarization segments of cathodic and anodic curves were extrapolated to determine corrosion current densities (i corr ) using V 3 studio software.…”

Section: Electrochemical Experimentsmentioning

confidence: 99%

Experimental and computational studies of the corrosion inhibitive effects of Zingiber officinale rhizomes on mild steel corrosion in acidic solutions

Adindu,

Nwanonenyi,

Ikpa

2023

J. Nig. Soc. Phys. Sci.

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The study investigates the anticorrosion potentials of Zingiber officinale (ZO) on mild steel induced in 1.0 M HCl and 0.5 M H2SO4 acid solution respectively using structural characterization (gas chromatography-mass spectroscopy, GC-MS and Fourier transform infrared spectroscopy, FTIR) and electrochemical (electrochemical impedance spectroscopy, EIS and potentiodynamic polarization, PDP) techniques respectively and theoretical simulations. The structural characterization was performed to identify chemical constituents and functional groups present in the plant extract whereas electrochemical techniques and theoretical computations were used to examine the anticorrosion potentials of the extract and validate the experimental results. The GC-MS result revealed the presence of twenty-three (23) compounds within the extract and out of which three (1-(1,5-dimethyl-4-hexenyl)-4-methyl-, dodecanoic acid and 9-Octadecenoic acid (Z)-2-hydroxy-1-(hydroxymethyl)ethyl ester) were selected for computational simulation and the results of FTIR revealed the presence of the following functional groups (O-H, C=C, C=O, C-C and C-H) in the ZO extract. The results of EIS revealed that extract of ZO exhibited corrosion inhibition efficieny of 82.7% and 93.6 % for mild steel in 1 M HCl and 0.5 M H2SO4 solution respectively at maximum inhibitor concentration of 1000 mg/L for mild steel. Also, PDP results revealed that ZO extract functioned as mixed inhibitor because both the anodic and cathodic reaction process was altered. The quantum chemical calculation results revealed that 9- Octadecenoic acid (Z)-2-hydroxy-1-(hydroxymethyl) ethyl ester had a good energy gap (\Delta E) compared to other two compounds, indicating its better adsorption interaction with the metal surface in sulfuric acid environment. This was further confirmed by its good adsorption energy of -355.55 Kcal/mol with mild steel surface in H2SO4 environment compared with -167.81Kcal/mol in HCl environment from the molecular dynamic simulation.

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“…The mild steel specimen used for the experiments has the weight percentage of C = 0.05, Mn = 0.6, P = 0.36, Si = 0.3 and the balance Fe [20][21]. The corrosive solution was KOH prepared using analytical grade reagents.…”

Section: Preparation Of Materialsmentioning

confidence: 99%

Corrosion inhibition behaviour of synthetic 2-(phenylsulphonamido)-3-methylbutanoic acid on mild steel in alkaline solution

Adindu¹

2023

Int. J. Sci. Res. Arch.

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The corrosion inhibiting behaviour of synthetic 2-(phenylsulphonamido)-3-methylbutanoic acid (PSMBA) on mild steel in the presence of 0.1 M KOH was investigated using combined gravimetric, electrochemical and theoretical simulation corrosion monitoring methods. The gravimetric data showed that the inhibitor effectively protected the metal from alkaline corrosion and that the inhibition ability depended on concentration increase and reduced gradually with prolonged immersion time. The electrochemical impedance spectroscopy results show that the charge transfer resistance increased with the addition of the inhibitor while potentiodynamic polarization results showed that the corrosion current density decreased upon the addition of the inhibitor, theoretical simulation results revealed a low and comparable energy gap between the LUMO and HOMO energies. All these showed that 2-(phenylsulphonamido)-3-methylbutanoic acid functioned as a good corrosion inhibitor for mild steel in alkaline medium.

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Exploiting the Anticorrosion Effects of Vernonia Amygdalina Extract for Protection of Mild Steel in Acidic Environments

Cited by 3 publications

References 46 publications

Determination of the corrosion inhibiting properties of ethanol extract of Pennisetum purpureum in acidic solutions

Determination of the corrosion inhibiting properties of ethanol extract of Pennisetum purpureum in acidic solutions

Experimental and computational studies of the corrosion inhibitive effects of Zingiber officinale rhizomes on mild steel corrosion in acidic solutions

Corrosion inhibition behaviour of synthetic 2-(phenylsulphonamido)-3-methylbutanoic acid on mild steel in alkaline solution

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