Inhibitory Mechanism of Carbon Steel Corrosion in Sea Water by an Aqueous Extract of Henna Leaves

Johnsirani, V.; Sathiyabama, J.; Rajendran, Susai; Prabha, A. Suriya

doi:10.5402/2012/574321

Cited by 19 publications

(20 citation statements)

References 23 publications

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“…This also further supports the inhibition activities of the plant extract under study. Similar results have been reported earlier (Johnsirani et al, 2012).…”

Section: Effect Of Extract Concentration On Inhibition Efficiencysupporting

confidence: 93%

“…The surface of the mild steel before immersion (Plate 1) appeared fine and smooth with a clear uniform pattern. This shows absence of any corrosion products formed on the metal surface (Johnsirani et al, 2012).…”

Section: Scanning Electron Microscopy (Sem)mentioning

confidence: 79%

“…It indicates clear disarrangement in the surface formation of the mild steel due to high metal dissolution rate and more active sites available for corrosion (Ji et al, 2012;Johnsirani et al, 2012).…”

Section: Scanning Electron Microscopy (Sem)mentioning

confidence: 99%

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Assessment of anti-corrosion potentials of extract of Ficus asperifolia -Miq (Moraceae) on mild steel in acidic medium

Fadare¹,

Okoronkwo²,

Olasehinde³

2016

Afr. J. Pure Appl. Chem.

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The inhibitory potentials of ethanolic extracts and four fractions of the stem bark of Ficus asperifoliaMiq. for the corrosion of mild steel were assessed using weight loss method, Fourier atomic absorption spectroscopy, scanning electron microscopy (SEM). The effects of varying immersion period, concentration of the inhibitors and temperatures for mild steel corrosion in 5 M HCl acid solution were carried out. A detailed kinetic reaction, thermodynamic (Ea, ∆H, ∆S) and adsorption isotherm studies were obtained. The crude extract of F. asperifolia (EFA) has the highest inhibition efficiency of 55%. The inhibitory efficiency of the four fractions of F. asperifolia (EFA) compared with the crude extract was in the order ethyl acetate > n-hexane > butanol > EFA > Aqueous. The inhibition efficiency was found to increase with increase in the extracts concentration but decreased with temperature. Corrosion rate increases with time but decreases with extracts concentration. The kinetic studies of the data followed a first order reaction. Thermodynamic studies revealed that corrosion inhibition may be due to spontaneous mixed adsorption of the plant constituents on the metal surface. Experimental data were fitted to Langmuir, Freundlich and Temkin adsorption isotherms. The plant investigated showed a good potential for green corrosion inhibitors. Investigation of phytochemical constituents showed that the extracts contain alkaloids, flavonoids, saponins, tannins anthraquinones and reducing sugars.

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“…This also further supports the inhibition activities of the plant extract under study. Similar results have been reported earlier (Johnsirani et al, 2012).…”

Section: Effect Of Extract Concentration On Inhibition Efficiencysupporting

confidence: 93%

Section: Scanning Electron Microscopy (Sem)mentioning

confidence: 79%

See 1 more Smart Citation

Assessment of anti-corrosion potentials of extract of Ficus asperifolia -Miq (Moraceae) on mild steel in acidic medium

Fadare¹,

Okoronkwo²,

Olasehinde³

2016

Afr. J. Pure Appl. Chem.

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“…Inhibition efficiencies (IE%) of o-nitrophenol-Zn 2+ systems in controlling corrosion of aluminium (6061) immersed in aqueous solution at pH 11 in the presence and absence of inhibitor system (immersion period -1 day) are given in Tables 1 and 2 [6][7][8][9]. …”

Section: Weight Loss Methodsmentioning

confidence: 99%

The inhibition effect of o-nitrophenol and Zn2+ system on corrosion of aluminium

2017

Int. J. Corros. Scale Inhib.

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Corrosion inhibition of aluminum (6061) in aqueous solution at pH 11 by o-nitrophenolZn 2+ systems has been reported. The study was carried out using classical weight loss method, potentiodynamic polarization study and Fourier Transform Infra-red Spectrocopy (FTIR) Technique. Experimental results indicated that the presence of o-nitrophenol-Zn 2+ inhibit the corrosion of Al(6061). The inhibition efficiency (IE) has been determined by the classical weight loss method. The maximum inhibition efficiency offered by the onitrophenol 250 ppm and Zn 2+ 50 ppm system is 94%. To determine the values of Linear polarization resistance (LPR) and corrosion current (I corr ), potentiodynamic polarization study has been used and it reveal that the inhibitor act as anodic inhibitor and it controls the anodic reaction. The protective film has been characterized by FTIR, SEM, EDAX and AFM. The protective film consists of Al 3+ -o-nitrophenol complex on the anodic metal surface. By using Density Functional Theory (DFT) various quantum chemical parameters such as E HOMO (highest occupied molecular orbital energy), E LUMO (lowest unoccupied molecular orbital energy), energy gap (ΔE), electron affinity (A), ionization potential (I), absolute electronegativity (χ), global hardness (η), softness (S), fraction of electrons transferred (ΔN) have been calculated and discussed. The theoretical results were found to be consistent with the experimental data generated. The inhibition efficiency of the inhibitor is evaluated by weight loss method.

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“…The extracts from plant leaves, roots and seed have been studied and found to be cheap, environmental friendly and good corrosion inhibitors [9]. Henna consists of four main constituents which are Lawsone, gallic acid, α-D-Glucose and tannic acid.…”

Section: Introductionmentioning

confidence: 99%

LawsonialnermisExtract Enhances Performance of Corrosion Protection of Coated Mild Steel in Seawater

et al. 2016

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Abstract. The investigation of coating incorporated with various percentages of henna has been conducted by means of weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy method. Mild steel has been studied at ambient temperature and 50°C in order to examine the effect of temperature. The potentiodynamic polarization measurements indicate that henna extract acts as a mixed inhibitor while the corrosion rate (CR) value decreases as the current density (I corr ) decreases in the presence of 10% henna extract for both temperatures. Surface and protective film analysis have been carried out using Fourier transform infrared (FTIR) and scanning electron microscopy (SEM).The inhibition activity is mainly correlated with the major active functional groups of lawsone. The main components can be found in lawsone structures are phenols O-H, carboxylic acid C=O and alkenes C=C. The morphology of the uninhibited sample showsa rough surface of mild steel as a result of corrosion process and severe damage can be seen. In the presence of henna, a smooth surface of mild steel anda uniform deposition of henna were observed.

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Inhibitory Mechanism of Carbon Steel Corrosion in Sea Water by an Aqueous Extract of Henna Leaves

Cited by 19 publications

References 23 publications

Assessment of anti-corrosion potentials of extract of Ficus asperifolia -Miq (Moraceae) on mild steel in acidic medium

Assessment of anti-corrosion potentials of extract of Ficus asperifolia -Miq (Moraceae) on mild steel in acidic medium

The inhibition effect of o-nitrophenol and Zn2+ system on corrosion of aluminium

LawsonialnermisExtract Enhances Performance of Corrosion Protection of Coated Mild Steel in Seawater

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