2,3-Diphenylbenzoquinoxaline: A new corrosion inhibitor for mild steel in sulphuric acid

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

doi:10.1016/j.corsci.2009.09.013

2,3-Diphenylbenzoquinoxaline: A new corrosion inhibitor for mild steel in sulphuric acid

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

^*Corresponding author for this work

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

145 Scopus citations

Abstract

2,3-diphenylbenzoquinoxaline (2,3DPQ) has been synthesized and its inhibiting action on the corrosion of mild steel in 0.5 M H₂SO₄ has been assessed by weight loss method at 30 °C. The results of the investigation show that this compound has excellent inhibiting properties for steel corrosion in sulphuric acid. Inhibition efficiency increases with increase in the concentration of the inhibitor. The adsorption of 2,3DPQ onto the mild steel surface followed the Langmuir adsorption model with the free energy of adsorption Δ G_ads⁰ of -11.4 kJ mol^-1. Quantum chemical calculations were employed to give further insight into the mechanism of inhibition action of 2,3DPQ.

Original language	English
Pages (from-to)	282-285
Number of pages	4
Journal	Corrosion Science
Volume	52
Issue number	1
DOIs	https://doi.org/10.1016/j.corsci.2009.09.013
State	Published - Jan 2010
Externally published	Yes

Keywords

2,3-Diphenylbenzoquinoxaline
Adsorption isotherm
Corrosion inhibitors
Density functional theory (DFT)

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
General Materials Science

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10.1016/j.corsci.2009.09.013

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title = "2,3-Diphenylbenzoquinoxaline: A new corrosion inhibitor for mild steel in sulphuric acid",

abstract = "2,3-diphenylbenzoquinoxaline (2,3DPQ) has been synthesized and its inhibiting action on the corrosion of mild steel in 0.5 M H2SO4 has been assessed by weight loss method at 30 °C. The results of the investigation show that this compound has excellent inhibiting properties for steel corrosion in sulphuric acid. Inhibition efficiency increases with increase in the concentration of the inhibitor. The adsorption of 2,3DPQ onto the mild steel surface followed the Langmuir adsorption model with the free energy of adsorption Δ Gads0 of -11.4 kJ mol-1. Quantum chemical calculations were employed to give further insight into the mechanism of inhibition action of 2,3DPQ.",

keywords = "2,3-Diphenylbenzoquinoxaline, Adsorption isotherm, Corrosion inhibitors, Density functional theory (DFT)",

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

year = "2010",

month = jan,

doi = "10.1016/j.corsci.2009.09.013",

language = "English",

volume = "52",

pages = "282--285",

journal = "Corrosion Science",

issn = "0010-938X",

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T1 - 2,3-Diphenylbenzoquinoxaline

T2 - A new corrosion inhibitor for mild steel in sulphuric acid

AU - Obot, I. B.

AU - Obi-Egbedi, N. O.

PY - 2010/1

Y1 - 2010/1

N2 - 2,3-diphenylbenzoquinoxaline (2,3DPQ) has been synthesized and its inhibiting action on the corrosion of mild steel in 0.5 M H2SO4 has been assessed by weight loss method at 30 °C. The results of the investigation show that this compound has excellent inhibiting properties for steel corrosion in sulphuric acid. Inhibition efficiency increases with increase in the concentration of the inhibitor. The adsorption of 2,3DPQ onto the mild steel surface followed the Langmuir adsorption model with the free energy of adsorption Δ Gads0 of -11.4 kJ mol-1. Quantum chemical calculations were employed to give further insight into the mechanism of inhibition action of 2,3DPQ.

AB - 2,3-diphenylbenzoquinoxaline (2,3DPQ) has been synthesized and its inhibiting action on the corrosion of mild steel in 0.5 M H2SO4 has been assessed by weight loss method at 30 °C. The results of the investigation show that this compound has excellent inhibiting properties for steel corrosion in sulphuric acid. Inhibition efficiency increases with increase in the concentration of the inhibitor. The adsorption of 2,3DPQ onto the mild steel surface followed the Langmuir adsorption model with the free energy of adsorption Δ Gads0 of -11.4 kJ mol-1. Quantum chemical calculations were employed to give further insight into the mechanism of inhibition action of 2,3DPQ.

KW - 2,3-Diphenylbenzoquinoxaline

KW - Adsorption isotherm

KW - Corrosion inhibitors

KW - Density functional theory (DFT)

UR - https://www.scopus.com/pages/publications/74249083204

U2 - 10.1016/j.corsci.2009.09.013

DO - 10.1016/j.corsci.2009.09.013

M3 - Article

AN - SCOPUS:74249083204

SN - 0010-938X

VL - 52

SP - 282

EP - 285

JO - Corrosion Science

JF - Corrosion Science

IS - 1

ER -

2,3-Diphenylbenzoquinoxaline: A new corrosion inhibitor for mild steel in sulphuric acid

Abstract

Keywords

ASJC Scopus subject areas

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