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Anticorrosion and Adsorption Mechanism of Rhizophora mangle L. Leaf-Extract on Steel-Reinforcement in 3.5% NaCl-Immersed Concrete

Okeniyi, Joshua Olusegun and Omotosho, Olugbenga Adeshola and Loto, Cleophas Akintoye and Popoola, Abimbola Patricia Idowu (2017) Anticorrosion and Adsorption Mechanism of Rhizophora mangle L. Leaf-Extract on Steel-Reinforcement in 3.5% NaCl-Immersed Concrete. In: Proceedings of the 3rd Pan American Materials Congress. The Minerals, Metals & Materials Series (1). Springer International Publishing, Springer, Cham, pp. 167-178. ISBN 978-3-319-52131-2

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Abstract

This paper studies anticorrosion and adsorption mechanism of Rhizophora mangle L. leaf-extract on steel-reinforcement in concrete immersed in 3.5% NaCl test-environment. Open circuit potential, macrocell current and corrosion rate measurements were obtained from steel-reinforced concrete samples, into which different concentrations of the leaf-extract was admixed during casting, and which were immersed in the saline/marine simulating-environment. Corrosion noise resistance was modelled as the ratio of standard deviation of the corrosion potential to the standard deviation of the corrosion current. Analyses of these test-results showed that the corrosion rate from linear polarization resistance exhibited very good correlation with the noise resistance model for the leaf-extract concentrations studied. Further analyses identified Rhizophora mangle L. leaf-extract concentration with excellent corrosion inhibition efficiency performance on steel-reinforcement. Also data of anticorrosion performance followed the Langmuir adsorption isotherm model, which indicated physisorption as the prevalent corrosion-protection mechanism by the Rhizophora mangle L. leaf-extract on steel-rebar in concrete immersed in the 3.5% NaCl, simulating saline/marine environment.

Item Type: Book Section
Uncontrolled Keywords: Rhizophora mangle L. leaf-extract; Steel-reinforcement in concrete; Corrosion noise resistance; Correlation fitting model; Adsorption isotherm; Saline/marine simulating-environment
Subjects: Q Science > Q Science (General)
Q Science > QA Mathematics
Q Science > QC Physics
Q Science > QD Chemistry
Q Science > QK Botany
T Technology > T Technology (General)
T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TD Environmental technology. Sanitary engineering
T Technology > TH Building construction
T Technology > TP Chemical technology
Divisions: Faculty of Engineering, Science and Mathematics > School of Chemistry
Faculty of Engineering, Science and Mathematics > School of Civil Engineering and the Environment
Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Faculty of Engineering, Science and Mathematics > School of Mathematics
Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Medicine, Health and Life Sciences > School of Biological Sciences
Depositing User: Dr Joshua Olusegun Okeniyi
Date Deposited: 28 Aug 2017 04:08
Last Modified: 28 Aug 2017 04:08
URI: http://eprints.covenantuniversity.edu.ng/id/eprint/8753

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