1,2-Diaminoanthraquinone as corrosion inhibitor for mild steel in hydrochloric acid: Weight loss and quantum chemical study

N. O. Obi-Egbedi; K. E. Essien; I. B. Obot; E. E. Ebenso

doi:10.1016/s1452-3981(23)15045-0

1,2-Diaminoanthraquinone as corrosion inhibitor for mild steel in hydrochloric acid: Weight loss and quantum chemical study

N. O. Obi-Egbedi, K. E. Essien, I. B. Obot^*, E. E. Ebenso

^*Corresponding author for this work

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

85 Scopus citations

Abstract

The corrosion inhibition and adsorption processes of 1,2-diaminoanthraquinone (DAQ) on mild steel in HCl was studied at different temperatures (303 - 333 K) by means of weight loss measurement and UV-visible spectrophotometric methods. The results indicate that the studied compound exhibits good performance as inhibitor for mild steel corrosion in 1 M HCl. The inhibition efficiency increases with decreasing temperature and increasing concentration of inhibitor. It has been determined that the adsorption of DAQ on mild steel obeys the Temkin adsorption isotherm at all studied temperatures with negative values of ΔG°_ads, suggesting a stable and a spontaneous inhibition process. Mechanism of physical adsorption is proposed from the values of E_a and ΔG°_ads obtained. The UV-visible absorption spectra of the solution containing the inhibitor after the immersion of mild steel specimen indicate the formation of a DAQ-Fe complex. Quantum chemical approach was further used to calculate some electronic properties of the molecule in order to ascertain any correlation between the inhibitive effect and molecular structure of DAQ.

Original language	English
Pages (from-to)	913-930
Number of pages	18
Journal	International Journal of Electrochemical Science
Volume	6
Issue number	4
DOIs	https://doi.org/10.1016/s1452-3981(23)15045-0
State	Published - Apr 2011
Externally published	Yes

Keywords

1,2-diaminoanthraquinone (DAQ)
Adsorption isotherm
Corrosion inhibition
Density functional theory (DFT)
Hydrochloric acid
Mild steel

ASJC Scopus subject areas

Electrochemistry

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10.1016/s1452-3981(23)15045-0

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title = "1,2-Diaminoanthraquinone as corrosion inhibitor for mild steel in hydrochloric acid: Weight loss and quantum chemical study",

abstract = "The corrosion inhibition and adsorption processes of 1,2-diaminoanthraquinone (DAQ) on mild steel in HCl was studied at different temperatures (303 - 333 K) by means of weight loss measurement and UV-visible spectrophotometric methods. The results indicate that the studied compound exhibits good performance as inhibitor for mild steel corrosion in 1 M HCl. The inhibition efficiency increases with decreasing temperature and increasing concentration of inhibitor. It has been determined that the adsorption of DAQ on mild steel obeys the Temkin adsorption isotherm at all studied temperatures with negative values of ΔG°ads, suggesting a stable and a spontaneous inhibition process. Mechanism of physical adsorption is proposed from the values of Ea and ΔG°ads obtained. The UV-visible absorption spectra of the solution containing the inhibitor after the immersion of mild steel specimen indicate the formation of a DAQ-Fe complex. Quantum chemical approach was further used to calculate some electronic properties of the molecule in order to ascertain any correlation between the inhibitive effect and molecular structure of DAQ.",

keywords = "1,2-diaminoanthraquinone (DAQ), Adsorption isotherm, Corrosion inhibition, Density functional theory (DFT), Hydrochloric acid, Mild steel",

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

year = "2011",

month = apr,

doi = "10.1016/s1452-3981(23)15045-0",

language = "English",

volume = "6",

pages = "913--930",

journal = "International Journal of Electrochemical Science",

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T1 - 1,2-Diaminoanthraquinone as corrosion inhibitor for mild steel in hydrochloric acid

T2 - Weight loss and quantum chemical study

AU - Obi-Egbedi, N. O.

AU - Essien, K. E.

AU - Obot, I. B.

AU - Ebenso, E. E.

PY - 2011/4

Y1 - 2011/4

N2 - The corrosion inhibition and adsorption processes of 1,2-diaminoanthraquinone (DAQ) on mild steel in HCl was studied at different temperatures (303 - 333 K) by means of weight loss measurement and UV-visible spectrophotometric methods. The results indicate that the studied compound exhibits good performance as inhibitor for mild steel corrosion in 1 M HCl. The inhibition efficiency increases with decreasing temperature and increasing concentration of inhibitor. It has been determined that the adsorption of DAQ on mild steel obeys the Temkin adsorption isotherm at all studied temperatures with negative values of ΔG°ads, suggesting a stable and a spontaneous inhibition process. Mechanism of physical adsorption is proposed from the values of Ea and ΔG°ads obtained. The UV-visible absorption spectra of the solution containing the inhibitor after the immersion of mild steel specimen indicate the formation of a DAQ-Fe complex. Quantum chemical approach was further used to calculate some electronic properties of the molecule in order to ascertain any correlation between the inhibitive effect and molecular structure of DAQ.

AB - The corrosion inhibition and adsorption processes of 1,2-diaminoanthraquinone (DAQ) on mild steel in HCl was studied at different temperatures (303 - 333 K) by means of weight loss measurement and UV-visible spectrophotometric methods. The results indicate that the studied compound exhibits good performance as inhibitor for mild steel corrosion in 1 M HCl. The inhibition efficiency increases with decreasing temperature and increasing concentration of inhibitor. It has been determined that the adsorption of DAQ on mild steel obeys the Temkin adsorption isotherm at all studied temperatures with negative values of ΔG°ads, suggesting a stable and a spontaneous inhibition process. Mechanism of physical adsorption is proposed from the values of Ea and ΔG°ads obtained. The UV-visible absorption spectra of the solution containing the inhibitor after the immersion of mild steel specimen indicate the formation of a DAQ-Fe complex. Quantum chemical approach was further used to calculate some electronic properties of the molecule in order to ascertain any correlation between the inhibitive effect and molecular structure of DAQ.

KW - 1,2-diaminoanthraquinone (DAQ)

KW - Adsorption isotherm

KW - Corrosion inhibition

KW - Density functional theory (DFT)

KW - Hydrochloric acid

KW - Mild steel

UR - https://www.scopus.com/pages/publications/79955160320

U2 - 10.1016/s1452-3981(23)15045-0

DO - 10.1016/s1452-3981(23)15045-0

M3 - Article

AN - SCOPUS:79955160320

SN - 1452-3981

VL - 6

SP - 913

EP - 930

JO - International Journal of Electrochemical Science

JF - International Journal of Electrochemical Science

IS - 4

ER -

1,2-Diaminoanthraquinone as corrosion inhibitor for mild steel in hydrochloric acid: Weight loss and quantum chemical study

Abstract

Keywords

ASJC Scopus subject areas

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