Thermodynamic study of metal corrosion and inhibitor adsorption processes in mild steel/1-methyl-4[4′(-X)-styryl pyridinium iodides/hydrochloric acid systems

Noor, Ehteram A.; Al-Moubaraki, Aisha H.

doi:10.1016/j.matchemphys.2008.01.028

Cited by 568 publications

(220 citation statements)

References 33 publications

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“…From the Table 3 the value of hydrogen evolution rate obtained as the slope from Figure 4 showed the addition of different concentration of inhibitors really reduced the rate of the gas evolved and this is corresponded to the increase in the inhibition efficiency as low value were obtained at elevated temperature but the hydrogen evolution rate increased. Similar behavior was reported by [20,27] that the value of hydrogen evolution rate (m1/min) evaluated from the slope of volume-time plots and the inhibition efficiency increase with rise in temperature in inhibited and uninhibited system as obtained for the present study.…”

Section: Gasometric Mesurementsupporting

confidence: 91%

“…This indicates that the activated complex in the rate of determining step represents an association rather than dissociation meaning that a decrease in disordering takes place on going from reactants to activated complex. Similar observations have been reported in the literature for mild steel dissolution in the absence and presence of inhibitors in H 2 SO 4 solution [27,35]. Also the ∆S values tend to more negative values as the extract concentration increases showing more ordered behavior leading to increase inhibition efficiency.…”

Section: Effect Of Temperature and Activation Parameters Of Inhibitiosupporting

confidence: 89%

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The Corrosion Inhibition of Mild Steel in Sulphuric Acid Solution by Adsorption of African Perquetina Leaves Extract

Abdulrahman¹,

Ganiyu²,

Kobe³

et al. 2015

IJIRSET

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ABSTRACT:The inhibition of mild steel corrosion in sulphuric acid solution was studied with application of Africa parquetina leaves extract (APLE) using Gravimetric, Gasometric and Thermometric measurements. The phytochemical characterization of the leaves extract were also carried out using Gas chromatography mass spectroscopy (GCMS) and Fourier transformation Infra Red (FTIR) analysis. The result showed the presence of phytochemical compounds and functional groups greatly contributed to the inhibitive strength. The inhibition efficiency at optimum concentration 0.5 g/l was 87.78 % and it was increased with the increase in concentration of APLE but decreased with increase in temperature. The adsorption of inhibitor obeyed Langmuir adsorption isotherm and the free energy of adsorption suggested that it was physisorption. Finally, the Dubinnin-Radushkevich isotherm model also suggested the techniques adopted in the corrosion measurement were in good agreement.

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Section: Gasometric Mesurementsupporting

confidence: 91%

Section: Effect Of Temperature and Activation Parameters Of Inhibitiosupporting

confidence: 89%

The Corrosion Inhibition of Mild Steel in Sulphuric Acid Solution by Adsorption of African Perquetina Leaves Extract

Abdulrahman¹,

Ganiyu²,

Kobe³

et al. 2015

IJIRSET

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“…45 Here, we plotted logð 22,23,46 Here, the adsorption of BTAOH on the mild steel surface in 1 mol/L HCl is a exothermic process, which validated the conclusion in the sections of ÁG 0 ads and E a calculation that BTAOH is physisorption on the mild steel surface in the 1 mol/L HCl. The very little negative ÁS 0 ads reveals that, the increase of disorders due to desorption of more water molecules from the mild steel surface almost equals to the decreases of one BTAOH physical confined on the mild steel surface and in the zig-zag polymer structure.…”

Section: Adsorption Considerationssupporting

confidence: 75%

1-hydroxy Benzotriazole as Corrosion Inhibitor for Mild Steel in 1 mol/L Hydrochloric Acid Solution

Guo

et al. 2017

Electrochemistry

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The inhibition ability of 1-hydroxy benzotriazole (BTAOH) for mild steel in HCL solution (1 mol/L) had been investigated in this manuscript. The inhibition efficiency of BTAOH showed a maximum value around 48% at 303 K, with the concentration 1.5 × 10 −3 mol/L. The physical adsrobed BTAOH molecules are more stable attached onto the mild steel surface than the corrosion products. The similar free energy of adsorption (ΔG 0 ads ) but much lower IE were ascribed to the thicker but less compact film constructed by the zig-zag H-bond connected BTAOH polymers. According to the effects of concentration and temperature on the adsorption behavior of the BTAOH, we had calculated the ΔG

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“…In physisorption process, it is assumed that acid anions such as NO 3 -ions are specifically adsorbed on the metal surface, donating an excess negative charge to the metal surface. In this way, potential of zero charge becomes less negative which promotes the adsorption of inhibitors in cationic form [63]; those of order of 40 kJ mol -1 or higher involve charge sharing or transfer from the inhibitor molecules to the metal surface to form a coordinate type of bond (chemisorptions) [64]. Straight lines of CInh/h versus CInh plots indicate that the adsorption of the inhibitor molecules on the metal surface obeyed Temkin adsorption model (Fig.…”

Section: Adsorption Isotherm and Thermodynamic Considerationmentioning

confidence: 94%

Inhibitive properties, thermodynamic, kinetics and quantum chemical calculations of polydentate Schiff base compounds as corrosion inhibitors for iron in acidic and alkaline media

Madkour

Elroby²

2015

Int J Ind Chem

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Quantum chemical calculations based on the density functional theory (DFT) method were performed on five polydentate Schiff base compounds (PSCs), act as corrosion inhibitors for iron in aerated 2.0 M HNO 3 and 2.0 M NaOH, aiming to analyze the characteristics of the inhibitor/surface mechanism as well as to analyze the experimental data and to describe the structural nature of the inhibitor on the corrosion process. The relationship between molecular structure of PSC and their inhibition efficiencies was discussed. The inhibition effect has been investigated using weight loss, thermometric, potentiodynamic polarization measurements and quantum chemical study. Among the compounds studied, 4-(2-hydroxynaphthylideneamino) antipyrine (PSC_1) exhibited the best inhibition efficiency IE (%) 78.4 % at 10 -4 M at 303 K. The high IE of (PSCs) was attributed to the blocking of active sites by adsorption of inhibitor molecules on the iron surface. Adsorption of (PSCs) inhibitors is spontaneous, exothermic, obeyed Temkin isotherm and is regarded as physiochemical mechanism. Polarization measurements indicate that all the examined Schiff bases are of mixedtype inhibitor in HNO 3 ; causing only inhibition of the cathode process in NaOH. The results showed that the inhibition efficiency of PSCs increased with the increase in E HOMO and decrease in E LUMO -E HOMO ; and the areas containing N and O atoms are most possible sites for bonding the metal iron surface by donating electrons to the metal.

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Thermodynamic study of metal corrosion and inhibitor adsorption processes in mild steel/1-methyl-4[4′(-X)-styryl pyridinium iodides/hydrochloric acid systems

Cited by 568 publications

References 33 publications

The Corrosion Inhibition of Mild Steel in Sulphuric Acid Solution by Adsorption of African Perquetina Leaves Extract

The Corrosion Inhibition of Mild Steel in Sulphuric Acid Solution by Adsorption of African Perquetina Leaves Extract

1-hydroxy Benzotriazole as Corrosion Inhibitor for Mild Steel in 1 mol/L Hydrochloric Acid Solution

Inhibitive properties, thermodynamic, kinetics and quantum chemical calculations of polydentate Schiff base compounds as corrosion inhibitors for iron in acidic and alkaline media

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