Xanthione: A new and effective corrosion inhibitor for mild steel in sulphuric acid solution

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

doi:10.1016/j.arabjc.2010.10.004

Xanthione: A new and effective corrosion inhibitor for mild steel in sulphuric acid solution

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

^*Corresponding author for this work

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

94 Scopus citations

Abstract

The adsorption and inhibition effect of xanthione (XION) on mild steel in 0.5M H₂SO₄ at 303-333K were studied using gravimetric and UV-visible spectrophotometric methods. The results obtained show that XION acts as an effective corrosion inhibitor for mild steel in sulphuric acid and inhibition efficiency reaches 98.0% at a very low inhibitor concentration of 10μM. Inhibition efficiency was found to increase with increase in XION concentration but decreased with temperature suggesting physical adsorption mechanism. Arrhenius law and its transition equation lead to estimate the activation parameters of the corrosion process. XION inhibits the corrosion of mild steel effectively at moderate temperature and adsorbs according to the Langmuir isotherm. Thermodynamic parameters governing the adsorption process have been calculated and discussed. The UV-visible absorption spectra of the solution containing the inhibitor after the immersion of mild steel specimen indicate the formation of a XEN-Fe complex. Attempt to correlate the molecular structure to quantum chemical indices was made using density functional theory (DFT).

Original language	English
Pages (from-to)	211-223
Number of pages	13
Journal	Arabian Journal of Chemistry
Volume	6
Issue number	2
DOIs	https://doi.org/10.1016/j.arabjc.2010.10.004
State	Published - Apr 2013
Externally published	Yes

Keywords

Density functional theory (DFT)
Mild steel corrosion inhibitors
Sulphuric acid
Xanthione

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering

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10.1016/j.arabjc.2010.10.004

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title = "Xanthione: A new and effective corrosion inhibitor for mild steel in sulphuric acid solution",

abstract = "The adsorption and inhibition effect of xanthione (XION) on mild steel in 0.5M H2SO4 at 303-333K were studied using gravimetric and UV-visible spectrophotometric methods. The results obtained show that XION acts as an effective corrosion inhibitor for mild steel in sulphuric acid and inhibition efficiency reaches 98.0\% at a very low inhibitor concentration of 10μM. Inhibition efficiency was found to increase with increase in XION concentration but decreased with temperature suggesting physical adsorption mechanism. Arrhenius law and its transition equation lead to estimate the activation parameters of the corrosion process. XION inhibits the corrosion of mild steel effectively at moderate temperature and adsorbs according to the Langmuir isotherm. Thermodynamic parameters governing the adsorption process have been calculated and discussed. The UV-visible absorption spectra of the solution containing the inhibitor after the immersion of mild steel specimen indicate the formation of a XEN-Fe complex. Attempt to correlate the molecular structure to quantum chemical indices was made using density functional theory (DFT).",

keywords = "Density functional theory (DFT), Mild steel corrosion inhibitors, Sulphuric acid, Xanthione",

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

year = "2013",

month = apr,

doi = "10.1016/j.arabjc.2010.10.004",

language = "English",

volume = "6",

pages = "211--223",

journal = "Arabian Journal of Chemistry",

issn = "1878-5352",

number = "2",

}

TY - JOUR

T1 - Xanthione

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

AU - Obi-Egbedi, N. O.

AU - Obot, I. B.

PY - 2013/4

Y1 - 2013/4

N2 - The adsorption and inhibition effect of xanthione (XION) on mild steel in 0.5M H2SO4 at 303-333K were studied using gravimetric and UV-visible spectrophotometric methods. The results obtained show that XION acts as an effective corrosion inhibitor for mild steel in sulphuric acid and inhibition efficiency reaches 98.0% at a very low inhibitor concentration of 10μM. Inhibition efficiency was found to increase with increase in XION concentration but decreased with temperature suggesting physical adsorption mechanism. Arrhenius law and its transition equation lead to estimate the activation parameters of the corrosion process. XION inhibits the corrosion of mild steel effectively at moderate temperature and adsorbs according to the Langmuir isotherm. Thermodynamic parameters governing the adsorption process have been calculated and discussed. The UV-visible absorption spectra of the solution containing the inhibitor after the immersion of mild steel specimen indicate the formation of a XEN-Fe complex. Attempt to correlate the molecular structure to quantum chemical indices was made using density functional theory (DFT).

AB - The adsorption and inhibition effect of xanthione (XION) on mild steel in 0.5M H2SO4 at 303-333K were studied using gravimetric and UV-visible spectrophotometric methods. The results obtained show that XION acts as an effective corrosion inhibitor for mild steel in sulphuric acid and inhibition efficiency reaches 98.0% at a very low inhibitor concentration of 10μM. Inhibition efficiency was found to increase with increase in XION concentration but decreased with temperature suggesting physical adsorption mechanism. Arrhenius law and its transition equation lead to estimate the activation parameters of the corrosion process. XION inhibits the corrosion of mild steel effectively at moderate temperature and adsorbs according to the Langmuir isotherm. Thermodynamic parameters governing the adsorption process have been calculated and discussed. The UV-visible absorption spectra of the solution containing the inhibitor after the immersion of mild steel specimen indicate the formation of a XEN-Fe complex. Attempt to correlate the molecular structure to quantum chemical indices was made using density functional theory (DFT).

KW - Density functional theory (DFT)

KW - Mild steel corrosion inhibitors

KW - Sulphuric acid

KW - Xanthione

UR - https://www.scopus.com/pages/publications/84875080159

U2 - 10.1016/j.arabjc.2010.10.004

DO - 10.1016/j.arabjc.2010.10.004

M3 - Article

AN - SCOPUS:84875080159

SN - 1878-5352

VL - 6

SP - 211

EP - 223

JO - Arabian Journal of Chemistry

JF - Arabian Journal of Chemistry

IS - 2

ER -

Xanthione: A new and effective corrosion inhibitor for mild steel in sulphuric acid solution

Abstract

Keywords

ASJC Scopus subject areas

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