Corrosion inhibition properties of thiosemicarbozone and semicarbazone derivatives in concentrated acid environment

Okafor, Peter C.; Oguzie, Emeka E.; Iniama, Grace E.; Ikpi, M. E.; Ekpe, U.J.

doi:10.4314/gjpas.v14i1.16779

Cited by 5 publications

(4 citation statements)

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“…The observed inhibition of the corrosion of mild steel in 1.0 M H 2 SO 4 solution indicates high degree of surface coverage. From a theoretical perspective, the adsorption route is regarded as a substitution process between the organic inhibitor in the aqueous solution (Inh sol ) and water molecules adsorbed at the metal surface (H 2 O ads ) as follows [36][37][38]:…”

Section: Adsorption Considerationmentioning

confidence: 99%

Acid Corrosion Inhibition and Adsorption Behaviour of Ethyl Hydroxyethyl Cellulose on Mild Steel Corrosion

Arukalam

Madu

Ijomah

et al. 2014

Journal of Materials

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The corrosion inhibition of mild steel in 1.0 M H2SO4 solution by ethyl hydroxyethyl cellulose has been studied in relation to the concentration of the additive using weight loss measurement, EIS, polarization, and quantum chemical calculation techniques. The results indicate that EHEC inhibited corrosion reaction in the acid medium and inhibition efficiency increased with EHEC concentration. Further increase in inhibition efficiency is observed in the presence of iodide ions, due to synergistic effect. Impedance results reveal that EHEC is adsorbed on the corroding metal surface. Adsorption followed a modified Langmuir isotherm, with very high negative values of the free energy of adsorption (ΔGads). The polarization data indicate that the inhibitor was of mixed type, with predominant effect on the cathodic partial reaction. The frontier molecular orbitals, HOMO (the highest occupied molecular orbital) and LUMO (the lowest unoccupied molecular orbital) as well as local reactivity of the EHEC molecule, were analyzed theoretically using the density functional theory to explain the adsorption characteristics at a molecular level. The theoretical predictions showed good agreement with experimental results.

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Section: Adsorption Considerationmentioning

confidence: 99%

Acid Corrosion Inhibition and Adsorption Behaviour of Ethyl Hydroxyethyl Cellulose on Mild Steel Corrosion

Arukalam

Madu

Ijomah

et al. 2014

Journal of Materials

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“…On addition of halide ions to acid media containing any organic compound, a co-operative effect results which inhibits iron corrosion [27][28][29][30]. However halide ions either stimulate or inhibit the corrosion of metal, depending on their concentration [28,29]. The inhibitive effects of halides have been reported to be in the order: I -) Br -[ Cl - [28,31].…”

Section: Introductionmentioning

confidence: 99%

“…However halide ions either stimulate or inhibit the corrosion of metal, depending on their concentration [28,29]. The inhibitive effects of halides have been reported to be in the order: I -) Br -[ Cl - [28,31]. The highest synergistic effect of iodide ions is reported to be due to chemisorption with metal surface due to its larger size and ease of polarizability [31].…”

Section: Introductionmentioning

confidence: 99%

Inhibition of CO2 corrosion of N80 carbon steel by carboxylic quaternary imidazoline and halide ions additives

Okafor

Liu

et al. 2009

J Appl Electrochem

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The inhibition of the corrosion of N80 mild steel by 2-undecyl-1-1-ethylamino-1-ethylcarboxyl quaternary imidazoline (CQI) in CO 2 -saturated 3% NaCl and 3% Na 2 SO 4 solutions was studied using electrochemical methods. Inhibition efficiency increased with increase in CQI concentration and synergistically increased in the presence of halide ions. CQI inhibited the corrosion reaction by chemical adsorption on the metal/solution interface in halide free solutions and by a combination of chemical and coulombic attraction in the presence of halide ions. The adsorption characteristics of the inhibitor were approximated by Frumkin isotherm and El-Awady et al. kinetic-thermodynamic model.

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“…The highest synergistic effect of I À ions is due to the chemisorption onto metal surface with its larger size and ease of polarization. 23,24 In our previous work involving copper protected by PA in 3% NaCl solution, the inhibition efficiency was below 90%. 12 In this work, we attempted to improve the inhibition effect of PA selfassembled monolayers (SAMs) on copper in 0.5 M H 2 SO 4 solution by the addition of I À ions.…”

Section: Introductionmentioning

confidence: 91%

The synergistic mechanism of phytic acid monolayers and iodide ions for inhibition of copper corrosion in acidic media

et al. 2014

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Corrosion inhibition properties of thiosemicarbozone and semicarbazone derivatives in concentrated acid environment

Cited by 5 publications

References 0 publications

Acid Corrosion Inhibition and Adsorption Behaviour of Ethyl Hydroxyethyl Cellulose on Mild Steel Corrosion

Acid Corrosion Inhibition and Adsorption Behaviour of Ethyl Hydroxyethyl Cellulose on Mild Steel Corrosion

Inhibition of CO2 corrosion of N80 carbon steel by carboxylic quaternary imidazoline and halide ions additives

The synergistic mechanism of phytic acid monolayers and iodide ions for inhibition of copper corrosion in acidic media

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