Adsorption Behaviour of [(4-Hydroxy-6-methyl-2-oxo-2H-pyran-3-yl)-(4-methoxy-phenyl)- methyl]-urea on Stainless Steel in Phosphoric Media

James, Olusola O.; Ajanaku, K. O.; Kehinde, Oladele Joseph; Olayinka, Ajani O.; Oluwatosin, John M.

doi:10.4152/pea.200905591

Cited by 10 publications

(2 citation statements)

References 14 publications

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“…The heat of adsorption ( Q ads ) was quantified from the trend of surface coverage with temperature using the following equation [34] :

2.303

where θ 1 and θ 2 are the degrees of surface coverage at temperatures T 1 and T 2 , and R is the gas constant. Negative Q ads values were obtained for the inhibition behavior of AD, GU and HYP ( Table 5 ).…”

Section: Resultsmentioning

confidence: 99%

Theoretical and experimental studies on the corrosion inhibition potentials of some purines for aluminum in 0.1M HCl

Eddy

Momoh-Yahaya

Oguzie

2015

Journal of Advanced Research

115

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Experimental aspect of the corrosion inhibition potential of adenine (AD), guanine (GU) and, hypoxanthine (HYP) was carried out using weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) methods while the theoretical aspect of the work was carried out by calculations of semi-empirical parameters (for AM1, MNDO, CNDO, PM3 and RM1 Hamiltonians), Fukui functions and inhibitor–metal interaction energies. Results obtained from the experimental studies were in good agreement and indicated that adenine (AD), guanine (GU) and hypoxanthine (HYP) are good adsorption inhibitors for the corrosion of aluminum in solutions of HCl. Data obtained from electrochemical experiment revealed that the studied purines functioned by adsorption on the aluminum/HCl interface and inhibited the cathodic half reaction to a greater extent and anodic half reaction to a lesser extent. The adsorption of the purines on the metal surface was found to be exothermic and spontaneous. Deviation of the adsorption characteristics of the studied purines from the Langmuir adsorption model was compensated by the fitness of Flory Huggins and El Awardy et al. adsorption models. Quantum chemical studies revealed that the experimental inhibition efficiencies of the studied purines are functions of some quantum chemical parameters including total energy of the molecules (TE), energy gap (EL–H), electronic energy of the molecule (EE), dipole moment and core–core repulsion energy (CCR). Fukui functions analysis through DFT and MP2 theories indicated slight complications and unphysical results. However, results obtained from calculated Huckel charges, molecular orbital and interaction energies, the adsorption of the inhibitors proceeded through the imine nitrogen (N5) in GU, emanine nitrogen (N7) in AD and the pyridine nitrogen (N5) in HPY.

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“…The heat of adsorption ( Q ads ) was quantified from the trend of surface coverage with temperature using the following equation [34] :

2.303

Section: Resultsmentioning

confidence: 99%

Theoretical and experimental studies on the corrosion inhibition potentials of some purines for aluminum in 0.1M HCl

Eddy

Momoh-Yahaya

Oguzie

2015

Journal of Advanced Research

115

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“…This suggests that SMLE acts as an inhibitor by formation of a thin coat which acts as a protective barrier film that blocks the corrosive agents from accessing the MS surface -solution interface. The degree of surface coverage was estimated from the expression [67].…”

Section: Adsorption Isotherm and Thermodynamicsmentioning

confidence: 99%

Inhibitory Effect of Stachytarpheta mutabilis Extracts on the Corrosion of Mild Steel in Acidic Media

Bassey,

2023

JSM Chem

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The anticorrosive potential of Stachytarpheta mutabilis leaf extract (SMLE) as a corrosion inhibitor for corrosion of mild steel (MS) in 1 M HCl was investigated using weight loss measurement as well as gasometric techniques at 30 and 60 oc. Relevant thermodynamic equations were employed to estimate the activation energy, enthalpy change and entropy change. The adsorption isotherms were used to determine the Gibbs free energy change. Results obtained showed that SMLE functioned as an excellent corrosion inhibitor for mild steel in the acidic environment. Temperature studies revealed a decrease in inhibition efficiency with increase in temperature and activation energies increased in the presence of the extract. The adsorption of SMLE on mild steel was approximated using Freundlich, Flory-Huggins, Frumkin, El-Awary’s and Temkin isotherms but Langmuir gave the best fit. Both kinetic and thermodynamic parameters governing the adsorption process were calculated and discussed. The adsorption followed a first order kinetics. As concluded from the results, the adsorption of S. mutabilis on mild steel in 1M HCl medium is feasible, spontaneous and it occurred by physical adsorption. From the experimental results obtained, it can be concluded that SMLE inhibit corrosion effectively when compared well with many reported green inhibitors for MS corrosion.

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Inhibitive properties, thermodynamic and quantum chemical studies of alloxazine on mild steel corrosion in H2SO4

2011

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Adsorption Behaviour of [(4-Hydroxy-6-methyl-2-oxo-2H-pyran-3-yl)-(4-methoxy-phenyl)- methyl]-urea on Stainless Steel in Phosphoric Media

Cited by 10 publications

References 14 publications

Theoretical and experimental studies on the corrosion inhibition potentials of some purines for aluminum in 0.1M HCl

Theoretical and experimental studies on the corrosion inhibition potentials of some purines for aluminum in 0.1M HCl

Inhibitory Effect of Stachytarpheta mutabilis Extracts on the Corrosion of Mild Steel in Acidic Media

Inhibitive properties, thermodynamic and quantum chemical studies of alloxazine on mild steel corrosion in H2SO4

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