Adsorption characteristics and corrosion inhibitive properties of clotrimazole for aluminium corrosion in hydrochloric acid

I. B. Obot; N. O. Obi-Egbedi; S. A. Umoren

doi:10.1016/s1452-3981(23)15190-x

Adsorption characteristics and corrosion inhibitive properties of clotrimazole for aluminium corrosion in hydrochloric acid

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

^*Corresponding author for this work

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

250 Scopus citations

Abstract

Clotrimazole (CTM) [1-[(2-chlorophenyl)-diphenyl-methyl]imidazole], an antifungal drug, was investigated as a corrosion inhibitor for aluminium in HCl using weight loss method. CTM inhibited the corrosion of aluminium in HCl. The inhibition efficiency increased with increase in the concentrations of CTM to reached 90.90% at 1 × 10^-4M, but decreased with increase in temperature. Phenomenon of physical adsorption is proposed for the inhibition and the process followed the Langmuir adsorption isotherm and kinetic/thermodynamic model of El-Awady et al. The mechanism of adsorption inhibition and type of adsorption isotherm were proposed from the trend of inhibition efficiency with temperature, E_a, ΔG_ads, and Q_ads. Quantum chemical calculations results show that CTM possesses a number of active centres concentrated mainly on the imidazole moiety of the molecule. The highest occupied molecular orbital (HOMO), and the lowest unoccupied molecular orbital (LUMO) were also found around the nitrogen atoms and the cyclic of the benzene rings.

Original language	English
Pages (from-to)	863-877
Number of pages	15
Journal	International Journal of Electrochemical Science
Volume	4
Issue number	6
DOIs	https://doi.org/10.1016/s1452-3981(23)15190-x
State	Published - 2009
Externally published	Yes

Keywords

Adsorption isotherm
Aluminium
Austin Model 1 (AM1)
Clotrimazole
Corrosion inhibition
Quantum chemical studies
Thermodynamics

ASJC Scopus subject areas

Electrochemistry

Access to Document

10.1016/s1452-3981(23)15190-x

Cite this

@article{7150f8861257434b81c71b7ec95640c9,

title = "Adsorption characteristics and corrosion inhibitive properties of clotrimazole for aluminium corrosion in hydrochloric acid",

abstract = "Clotrimazole (CTM) [1-[(2-chlorophenyl)-diphenyl-methyl]imidazole], an antifungal drug, was investigated as a corrosion inhibitor for aluminium in HCl using weight loss method. CTM inhibited the corrosion of aluminium in HCl. The inhibition efficiency increased with increase in the concentrations of CTM to reached 90.90\% at 1 × 10-4M, but decreased with increase in temperature. Phenomenon of physical adsorption is proposed for the inhibition and the process followed the Langmuir adsorption isotherm and kinetic/thermodynamic model of El-Awady et al. The mechanism of adsorption inhibition and type of adsorption isotherm were proposed from the trend of inhibition efficiency with temperature, Ea, ΔGads, and Qads. Quantum chemical calculations results show that CTM possesses a number of active centres concentrated mainly on the imidazole moiety of the molecule. The highest occupied molecular orbital (HOMO), and the lowest unoccupied molecular orbital (LUMO) were also found around the nitrogen atoms and the cyclic of the benzene rings.",

keywords = "Adsorption isotherm, Aluminium, Austin Model 1 (AM1), Clotrimazole, Corrosion inhibition, Quantum chemical studies, Thermodynamics",

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

year = "2009",

doi = "10.1016/s1452-3981(23)15190-x",

language = "English",

volume = "4",

pages = "863--877",

journal = "International Journal of Electrochemical Science",

issn = "1452-3981",

publisher = "Elsevier B.V.",

number = "6",

}

TY - JOUR

T1 - Adsorption characteristics and corrosion inhibitive properties of clotrimazole for aluminium corrosion in hydrochloric acid

AU - Obot, I. B.

AU - Obi-Egbedi, N. O.

AU - Umoren, S. A.

PY - 2009

Y1 - 2009

N2 - Clotrimazole (CTM) [1-[(2-chlorophenyl)-diphenyl-methyl]imidazole], an antifungal drug, was investigated as a corrosion inhibitor for aluminium in HCl using weight loss method. CTM inhibited the corrosion of aluminium in HCl. The inhibition efficiency increased with increase in the concentrations of CTM to reached 90.90% at 1 × 10-4M, but decreased with increase in temperature. Phenomenon of physical adsorption is proposed for the inhibition and the process followed the Langmuir adsorption isotherm and kinetic/thermodynamic model of El-Awady et al. The mechanism of adsorption inhibition and type of adsorption isotherm were proposed from the trend of inhibition efficiency with temperature, Ea, ΔGads, and Qads. Quantum chemical calculations results show that CTM possesses a number of active centres concentrated mainly on the imidazole moiety of the molecule. The highest occupied molecular orbital (HOMO), and the lowest unoccupied molecular orbital (LUMO) were also found around the nitrogen atoms and the cyclic of the benzene rings.

AB - Clotrimazole (CTM) [1-[(2-chlorophenyl)-diphenyl-methyl]imidazole], an antifungal drug, was investigated as a corrosion inhibitor for aluminium in HCl using weight loss method. CTM inhibited the corrosion of aluminium in HCl. The inhibition efficiency increased with increase in the concentrations of CTM to reached 90.90% at 1 × 10-4M, but decreased with increase in temperature. Phenomenon of physical adsorption is proposed for the inhibition and the process followed the Langmuir adsorption isotherm and kinetic/thermodynamic model of El-Awady et al. The mechanism of adsorption inhibition and type of adsorption isotherm were proposed from the trend of inhibition efficiency with temperature, Ea, ΔGads, and Qads. Quantum chemical calculations results show that CTM possesses a number of active centres concentrated mainly on the imidazole moiety of the molecule. The highest occupied molecular orbital (HOMO), and the lowest unoccupied molecular orbital (LUMO) were also found around the nitrogen atoms and the cyclic of the benzene rings.

KW - Adsorption isotherm

KW - Aluminium

KW - Austin Model 1 (AM1)

KW - Clotrimazole

KW - Corrosion inhibition

KW - Quantum chemical studies

KW - Thermodynamics

UR - https://www.scopus.com/pages/publications/70249121805

U2 - 10.1016/s1452-3981(23)15190-x

DO - 10.1016/s1452-3981(23)15190-x

M3 - Article

AN - SCOPUS:70249121805

SN - 1452-3981

VL - 4

SP - 863

EP - 877

JO - International Journal of Electrochemical Science

JF - International Journal of Electrochemical Science

IS - 6

ER -

Adsorption characteristics and corrosion inhibitive properties of clotrimazole for aluminium corrosion in hydrochloric acid

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Fingerprint

Cite this