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

Okeniyi, Joshua Olusegun and Popoola, Abimbola Patricia Id and Loto, Cleophas Akintoye and Omotosho, Olugbenga Adeshola (2015) Performance of Rhizophora mangle L. leaf-extract and sodium dichromate synergies on steelreinforcement corrosion in 0.5 M H2SO4-immersed concrete. NACE - International Corrosion Conference Series, 2015 (5636). pp. 1-10.

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Abstract

This paper investigates performance of different synergistic combinations of Rhizophora mangle L leaf-extract 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 Na2Cr2O7 usage for controlling corrosion in steel-reinforced concretes for the microbial/industrial environment. © 2015 by Nace International.

Item Type: Article
Additional Information: Conference of Corrosion 2015: Collaborate. Educate. Innovate. Mitigate. ; Conference Date: 15 March 2015 Through 19 March 2015; Conference Code:113704
Uncontrolled Keywords: Columns (structural); Composite structures; Concrete additives; Concrete slabs; Concretes; Corrosion; Corrosion inhibitors; Distribution functions; Electrochemical corrosion; Plant extracts; Probability distributions; Reinforced concrete; Sodium; Weibull distribution, Inhibition efficiency; Leaf extracts; Microbial/industrial simulating environment; Sodium dichromate; Synergistic parameter, Corrosion rate
Subjects: Q Science > Q Science (General)
Q Science > QA Mathematics
Q Science > QC Physics
Q Science > QD Chemistry
S Agriculture > S Agriculture (General)
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 > TJ Mechanical engineering and machinery
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
Depositing User: Dr Joshua Olusegun Okeniyi
Date Deposited: 15 Aug 2016 14:45
Last Modified: 15 Aug 2016 14:45
URI: http://eprints.covenantuniversity.edu.ng/id/eprint/6888

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