Thermodynamic, adsorption and electrochemical studies for corrosion inhibition of carbon steel by henna extract in acid medium

Hamdy, A.; El-Gendy, Nour Sh.

doi:10.1016/j.ejpe.2012.06.002

Cited by 232 publications

(119 citation statements)

References 24 publications

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“…1a). Several scientists in their studies (Table 3) reported similar results [2,4,6,[15][16][17][18][19], which confirm that the SSE act as effective inhibitors. The evolution in inhibition efficiency may be attributed to the adsorption of the particles at the carbon steel (X52) surfaces [20].…”

Section: Weight Loss Measurementssupporting

confidence: 64%

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Saccocalyx satureioides as corrosion inhibitor for carbon steel in acid solution

et al. 2016

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The inhibitory effect of the crude ethyl acetate extract of Saccocalyx satureioides was estimated on the corrosion of carbon steel (X52) in 1 M HCl solution sing weight loss measurement, potentiodynamic polarization, electrochemical impedance spectroscopy and scanning electron microscopy techniques. Potentiodynamic polarization curves indicated that the plants extract behaves as a mixed-type inhibitor. The adsorption of the inhibitor on the carbon steel surface was found to follow Freundlich adsorption isotherm. The free energies, enthalpies and entropies for the adsorption and dissolution process were discussed in details. The inhibiting action increases with increasing concentration of the extract. The results obtained show that the extract of the aerial parts of Saccocalyx satureioides could serve as an effective corrosion inhibitor of carbon steel (X52) in hydrochloric acid medium.

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Section: Weight Loss Measurementssupporting

confidence: 64%

“…It is less than the -40 kJ mol -1 required for chemical adsorption. Allows with the decrease of IE (%) with increasing temperature confirm the mechanism of physical adsorption [18]. The negative sign of DH ads 0 shows that the adsorption of inhibitor is an exothermic process [25,26].…”

Section: Thermodynamic Parametersmentioning

confidence: 85%

Saccocalyx satureioides as corrosion inhibitor for carbon steel in acid solution

et al. 2016

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“…It can be seen in the Table 8 that E a is higher in the presence of the inhibitors than in their absence and increased with the increase in concentration of EAE and BE, which indicate a strong adsorption of the inhibitor molecules at the CS surface [1]. An alternative form of Arrhenius equation is the transition-state equation [38,39]:…”

Section: Effect Of the Temperaturementioning

confidence: 99%

“…For both ethyl acetate and n-butanol extracts, the positive signs of enthalpies reflect the endothermic nature of the dissolution process [39,40]. It is evident from data listed in Table 8 that, the values of E 0 a are larger than corresponding values of gH 0 a indicating the corrosion process involved a gaseous reaction, simply the hydrogen evolution reaction, associated with a decrease in total reaction volume [39,40]. Moreover, the difference value E 0 a À gH 0 a is 2.74 kJ/mol, which is approximately equal to the average value of RT.…”

Section: Effect Of the Temperaturementioning

confidence: 99%

Corrosion inhibition of carbon steel in 1 M H2SO4 solution by Thapsia villosa extracts

et al. 2016

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Ethyl acetate extract (EAE) and butanolic extract (BE) of Thapsia villosa were investigated as corrosion inhibitors of Carbon Steel (CS) in 1 M H 2 SO 4 using electrochemical impedance spectroscopy (EIS) techniques, potentiodynamic polarization and weight loss measurements. The effect of temperature on the corrosion behavior of CS was studied in the range of 20-40°C. The experimental results show that EAE and BE are good corrosion inhibitors and the protection efficiency increased with increasing concentration of the extracts, but decrease with rise in temperature. The EAE and BE act as a mixed types inhibitors. The adsorption of extracts on CS surface follow Langmuir isotherm. The apparent energies, enthalpies and entropies of the dissolution process were discussed.

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“…According to the SEM micrographs, P3 showed an excellent performance and also the best out of all the other types of paint; it had a smooth surface that was crack-free. In addition, the presence of the optimum inhibitor percentage in this sample reduced surface damage and resulted in a smooth surface [27,28]. Due to the limitation of the absorption of henna extract towards the substrate, a small crack and damage on the surface of the P4 sample appeared.…”

Section: Scanning Electron Microscopementioning

confidence: 99%

Non-destructive tests on eco-friendly anti-corrosion paint

Hajar¹,

ISMAIL²,

Zulkifli³

et al. 2017

J. MECH. ENG. SCI.

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Henna is identified as an excellent corrosion inhibitor and due to this reason, a research project was conducted in order to investigate the ability of henna extracts to act as an anticorrosive agent with the compatible composition for paint systems. The paint composition consisted of colophony (WW types), plasticiser (oleic acid), pigment (calcium carbonate), solvent (mixture of xylene/white spirit) and additives (zinc oxide and henna leaf extract). These ingredients were mixed until they were soluble and stirred using a high-speed disperser. In order to measure the effectiveness of the new paint system, several nondestructive tests were conducted to investigate the inhibitive properties of henna extract including measurement of substrate mass loss. The inhibition efficiency (IE) increased with the increasing amounts of inhibitor. The highest IE (%) was 77.63% and this was produced by the paint with 8% inhibitor (P3). However, the IE value started to decrease when 12% of henna extract was incorporated into the paint matrix (P4: 58.40%). Thus, P3 acted as an optimum paint with respect to its performance on the corrosion inhibition efficiency based on mass loss measurement and electrochemical studies. Surface analyses were carried out using infrared thermography and scanning electron microscopy. These surface analysis test was carried out to support mass loss and electrochemical study. Based on the results, the performance of henna extract as a corrosion inhibitor on aluminium surface showed a great impact with the 8% of henna extract presence in the paint formulation.

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Thermodynamic, adsorption and electrochemical studies for corrosion inhibition of carbon steel by henna extract in acid medium

Cited by 232 publications

References 24 publications

Saccocalyx satureioides as corrosion inhibitor for carbon steel in acid solution

Saccocalyx satureioides as corrosion inhibitor for carbon steel in acid solution

Corrosion inhibition of carbon steel in 1 M H2SO4 solution by Thapsia villosa extracts

Non-destructive tests on eco-friendly anti-corrosion paint

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