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Performance of Rhizophora mangle L. leaf-extract and sodium dichromate synergies on steel reinforcement corrosion in 0.5 M H2SO4-immersed concrete

Okeniyi, Joshua Olusegun and Loto, C. A. and Popoola, A. P. I. and Omotosho, Olugbenga Adeshola (2015) Performance of Rhizophora mangle L. leaf-extract and sodium dichromate synergies on steel reinforcement corrosion in 0.5 M H2SO4-immersed concrete. In: CORROSION 2015 CONFERENCE & EXPO.

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Abstract

This paper investigates performance of different synergistic combinations of Rhizophora mangle L leafextract and sodium dichromate (Na2Cr2O7) admixtures on the corrosion of steel-reinforcement in 0.5 M H2SO4-immersed concrete. Steel-reinforcement corrosion, in concrete slabs partially-immersed in the microbial/industrial simulating test-environment, were assessed using non-destructive electrochemical measurements of corrosion rate (CR) and open circuit potential (OCP) . Probability distribution function (pdf) analyses, as prescribed by ASTM G16-95 R04, of the scatter of corrosion test-data showed that while datasets of OCP distributed like the Normal, the Gumbel and Weibull pdf’s, the datasets of CR were best fitted by the Weibull pdf. Results identified 6 g Rhizophora mangle L leaf-extract + 2 g Na2Cr2O7 synergistic admixture with both optimal inhibition efficiency, η = 90.12%, and synergistic parameter that indicated excellent synergistic interaction of the plant-extract with Na2Cr2O7 chemical.That this synergistic admixture out-performed the also effective Na2Cr2O7 admixtures in the study suggests suitability of Rhizophora mangle L leaf-extract as eco-friendly replacement of toxic Na2Cr2O7 inhibitor in H2SO4-immersed steel-reinforced concrete. This is potent with the advantage of reducing environmental effect from lower Na2Cr2O4 usage for controlling corrosion in steel-reinforced concretes for the microbial/industrial environment.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Rhizophora mangle L leaf-extract, sodium dichromate, concrete steel-rebar,microbial/industrial simulating environment, inhibition efficiency, synergistic parameter
Subjects: T Technology > T Technology (General)
T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User: Mrs Hannah Akinwumi
Date Deposited: 20 Apr 2018 10:02
Last Modified: 20 Apr 2018 10:02
URI: http://eprints.covenantuniversity.edu.ng/id/eprint/10653

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