Indeno-1-one [2,3-b]quinoxaline as an effective inhibitor for the corrosion of mild steel in 0.5 M H2SO4 solution

I. B. Obot; N. O. Obi-Egbedi

doi:10.1016/j.matchemphys.2010.03.037

Indeno-1-one [2,3-b]quinoxaline as an effective inhibitor for the corrosion of mild steel in 0.5 M H₂SO₄ solution

I. B. Obot^*
, N. O. Obi-Egbedi

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

151 Scopus citations

Abstract

Indeno-1-one [2,3-b] quinoxaline (INQUI), synthesized in our laboratory, was tested as inhibitor for the corrosion of mild steel in 0.5 M H₂SO₄ using gravimetric method at 30 °C. The inhibitor (INQUI) showed about 81% inhibition efficiency (E (%)) at an optimum concentration of 10 × 10^-6 M. The inhibition efficiency increases with increase in inhibitor concentration but decreases with increase in immersion time. The adsorption of the inhibitor on the mild steel in the acid solution was found to accord with Temkin's adsorption isotherm. The calculated value of the free energy for the adsorption process, ΔG_ads, reveals a strong chemisorbed bond between the inhibitor and mild steel surface and a spontaneous adsorption of the inhibitor on the mild steel surface. Density functional theory (DFT) proves that INQUI molecule is adsorbed on the mild steel surface by the most negatively charged nitrogen and oxygen atoms.

Original language	English
Pages (from-to)	325-328
Number of pages	4
Journal	Materials Chemistry and Physics
Volume	122
Issue number	2-3
DOIs	https://doi.org/10.1016/j.matchemphys.2010.03.037
State	Published - 1 Aug 2010
Externally published	Yes

Keywords

Corrosion inhibitors
Density functional theory (DFT)
Indeno-1-one [2,3-b] quinoxaline
Sulphuric acid

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics

Access to Document

10.1016/j.matchemphys.2010.03.037

Cite this

@article{a655be58a09c4c18b1b8595c8c142e1b,

title = "Indeno-1-one [2,3-b]quinoxaline as an effective inhibitor for the corrosion of mild steel in 0.5 M H2SO4 solution",

abstract = "Indeno-1-one [2,3-b] quinoxaline (INQUI), synthesized in our laboratory, was tested as inhibitor for the corrosion of mild steel in 0.5 M H2SO4 using gravimetric method at 30 °C. The inhibitor (INQUI) showed about 81\% inhibition efficiency (E (\%)) at an optimum concentration of 10 × 10-6 M. The inhibition efficiency increases with increase in inhibitor concentration but decreases with increase in immersion time. The adsorption of the inhibitor on the mild steel in the acid solution was found to accord with Temkin's adsorption isotherm. The calculated value of the free energy for the adsorption process, ΔGads, reveals a strong chemisorbed bond between the inhibitor and mild steel surface and a spontaneous adsorption of the inhibitor on the mild steel surface. Density functional theory (DFT) proves that INQUI molecule is adsorbed on the mild steel surface by the most negatively charged nitrogen and oxygen atoms.",

keywords = "Corrosion inhibitors, Density functional theory (DFT), Indeno-1-one [2,3-b] quinoxaline, Sulphuric acid",

author = "Obot, \{I. B.\} and Obi-Egbedi, \{N. O.\}",

year = "2010",

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doi = "10.1016/j.matchemphys.2010.03.037",

language = "English",

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journal = "Materials Chemistry and Physics",

issn = "0254-0584",

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TY - JOUR

T1 - Indeno-1-one [2,3-b]quinoxaline as an effective inhibitor for the corrosion of mild steel in 0.5 M H2SO4 solution

AU - Obot, I. B.

AU - Obi-Egbedi, N. O.

PY - 2010/8/1

Y1 - 2010/8/1

N2 - Indeno-1-one [2,3-b] quinoxaline (INQUI), synthesized in our laboratory, was tested as inhibitor for the corrosion of mild steel in 0.5 M H2SO4 using gravimetric method at 30 °C. The inhibitor (INQUI) showed about 81% inhibition efficiency (E (%)) at an optimum concentration of 10 × 10-6 M. The inhibition efficiency increases with increase in inhibitor concentration but decreases with increase in immersion time. The adsorption of the inhibitor on the mild steel in the acid solution was found to accord with Temkin's adsorption isotherm. The calculated value of the free energy for the adsorption process, ΔGads, reveals a strong chemisorbed bond between the inhibitor and mild steel surface and a spontaneous adsorption of the inhibitor on the mild steel surface. Density functional theory (DFT) proves that INQUI molecule is adsorbed on the mild steel surface by the most negatively charged nitrogen and oxygen atoms.

AB - Indeno-1-one [2,3-b] quinoxaline (INQUI), synthesized in our laboratory, was tested as inhibitor for the corrosion of mild steel in 0.5 M H2SO4 using gravimetric method at 30 °C. The inhibitor (INQUI) showed about 81% inhibition efficiency (E (%)) at an optimum concentration of 10 × 10-6 M. The inhibition efficiency increases with increase in inhibitor concentration but decreases with increase in immersion time. The adsorption of the inhibitor on the mild steel in the acid solution was found to accord with Temkin's adsorption isotherm. The calculated value of the free energy for the adsorption process, ΔGads, reveals a strong chemisorbed bond between the inhibitor and mild steel surface and a spontaneous adsorption of the inhibitor on the mild steel surface. Density functional theory (DFT) proves that INQUI molecule is adsorbed on the mild steel surface by the most negatively charged nitrogen and oxygen atoms.

KW - Corrosion inhibitors

KW - Density functional theory (DFT)

KW - Indeno-1-one [2,3-b] quinoxaline

KW - Sulphuric acid

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DO - 10.1016/j.matchemphys.2010.03.037

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