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Introduction: The use of chemical inhibitor for low-carbon steel corrosion has been investigated to be the most practical
and cost effective means of preventing corrosion, however some plants extracts contains various organic compounds (e.g.
Alkaloids, tannins, proteins, saponin, pigments, organic and amino acids); which some have been reported to possess
corrosion inhibition abilities. This present study has a dual purpose; first to further establish the effectiveness of plant extracts
as corrosion inhibitors and second to attempt deduction of the inhibition mechanism and possible adsorption modes of the
extractâ??s active components.
Methods: Gravimetric experiments: This technique is based on the principle of weight loss as previously described in literature.
However experiments were conducted at 30°C, 50°C and 60°C.
Theoretical Modeling Simulations: All theoretical calculations were performed with the density functional theory (DFT)
(5) electronic structure programs using DMol3 with generalized gradient approximation(GGA) as contained in the Materials
Studio 5.5 software.
Results & Discussion: The corrosion process was inhibited by adsorption of the extract organic matter of Aspilia africana
on the steel surface and addition of potassium iodide (KI) synergistically increased the inhibition efficiency of the extract.
Adsorption of the phytochemicals on the surface of the metal conformed to langmuir, temkin and freundlich isotherm. The
DFT-based quantum chemical computation of parameters associated with the molecular electronic structures of one of the
active constituents of the leave extract (Inositol) confirmed their corrosion inhibiting potential and established their individual
contributions to the observed inhibiting effect.
Conclusion: Based on the results obtained, the following were concluded; 1) The corrosion of low-carbon steel in HCl increases
with increase in concentration of the acid and also with the period of contact and temperature. 2) Corrosion inhibition of
Aspilia africana is attributed to chemisorptions of the phytochemical components of the extracts on the surface of the metal.
Biography
Nkechi Ibisi is a chemist involved in teaching and research at the Michael Okpara University of Agriculture Umudike. She received her Ph.D in Physical Chemistry
from Michael Okpara University of Agriculture after a one year doctoral research at the University of Science and Technology China(USTC). Two years later, she
proceeded to USTC for her post-doctoral studies on copper embedded on hexagonal boron nitride(h-BN) sheet a low-dimensional material for catalytic oxidation
of CO. The theoretical calculations were performed with density functional theory(DFT) electronic structure program using DMOl3 software. She has a certificate
on Information and Communication Technology in Education from UNESCO - Bangkok e-learning series. In addition to teaching and research, she is a regular
contributor to women and gender issues and enthusiastic about community programs to build and enhance opportunities for women and the girl child. She is
currently the Deputy Director for the Center for Gender and Child Development at Michael Okpara University of Agriculture.
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