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

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

doi:10.1016/j.corsci.2010.09.020

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

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

^*Corresponding author for this work

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

252 Scopus citations

Abstract

Alloxazine (ALLOX) was tested as corrosion inhibitor for mild steel in 0.5M H₂SO₄ solution using non-electrochemical technique (gravimetric and UV-Visible spectrophotometric measurements) at 303-333K. ALLOX acts as inhibitor for mild steel in acidic medium. Inhibition efficiency increases with increase in concentration of ALLOX but decrease with rise in temperature. The adsorption of ALLOX was found to follow Temkin adsorption isotherm model. Both the activation and thermodynamic parameters governing the adsorption process were calculated and discussed. The adsorption follows a first-order kinetics. DFT study gave further insight into the mechanism of inhibition action of ALLOX.

Original language	English
Pages (from-to)	263-275
Number of pages	13
Journal	Corrosion Science
Volume	53
Issue number	1
DOIs	https://doi.org/10.1016/j.corsci.2010.09.020
State	Published - Jan 2011
Externally published	Yes

Keywords

A. Alloxazine
B. Mild steel
C. Sulphuric acid
D. Density functional theory (DFT)

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
General Materials Science

Access to Document

10.1016/j.corsci.2010.09.020

Cite this

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abstract = "Alloxazine (ALLOX) was tested as corrosion inhibitor for mild steel in 0.5M H2SO4 solution using non-electrochemical technique (gravimetric and UV-Visible spectrophotometric measurements) at 303-333K. ALLOX acts as inhibitor for mild steel in acidic medium. Inhibition efficiency increases with increase in concentration of ALLOX but decrease with rise in temperature. The adsorption of ALLOX was found to follow Temkin adsorption isotherm model. Both the activation and thermodynamic parameters governing the adsorption process were calculated and discussed. The adsorption follows a first-order kinetics. DFT study gave further insight into the mechanism of inhibition action of ALLOX.",

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AU - Obi-Egbedi, N. O.

AU - Obot, I. B.

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N2 - Alloxazine (ALLOX) was tested as corrosion inhibitor for mild steel in 0.5M H2SO4 solution using non-electrochemical technique (gravimetric and UV-Visible spectrophotometric measurements) at 303-333K. ALLOX acts as inhibitor for mild steel in acidic medium. Inhibition efficiency increases with increase in concentration of ALLOX but decrease with rise in temperature. The adsorption of ALLOX was found to follow Temkin adsorption isotherm model. Both the activation and thermodynamic parameters governing the adsorption process were calculated and discussed. The adsorption follows a first-order kinetics. DFT study gave further insight into the mechanism of inhibition action of ALLOX.

AB - Alloxazine (ALLOX) was tested as corrosion inhibitor for mild steel in 0.5M H2SO4 solution using non-electrochemical technique (gravimetric and UV-Visible spectrophotometric measurements) at 303-333K. ALLOX acts as inhibitor for mild steel in acidic medium. Inhibition efficiency increases with increase in concentration of ALLOX but decrease with rise in temperature. The adsorption of ALLOX was found to follow Temkin adsorption isotherm model. Both the activation and thermodynamic parameters governing the adsorption process were calculated and discussed. The adsorption follows a first-order kinetics. DFT study gave further insight into the mechanism of inhibition action of ALLOX.

KW - A. Alloxazine

KW - B. Mild steel

KW - C. Sulphuric acid

KW - D. Density functional theory (DFT)

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DO - 10.1016/j.corsci.2010.09.020

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SP - 263

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JO - Corrosion Science

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