Effects of Phyllanthus muellerianus leaf-extract on steel-reinforcement corrosion in 3.5% NaCl-immersed concrete.

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Department of Chemical and Metallurgical and Materials Engineering - Research Articles

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Okeniyi, Joshua Olusegun., Loto, C. A., Popoola, A. P. I.. Metals; 27 October 2016. Effects of Phyllanthus muellerianus leaf-extract on steel-reinforcement corrosion in 3.5% NaCl-immersed concrete..

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Title: Effects of Phyllanthus muellerianus leaf-extract on steel-reinforcement corrosion in 3.5% NaCl-immersed concrete.
Creator: Okeniyi, Joshua Olusegun.
Creator: Loto, C. A.
Creator: Popoola, A. P. I.
Subject: Steel-reinforcement corrosion.
Subject: Non-destructive tests.
Subject: Electrochemical corrosion monitoring.
Subject: Saline/marine simulating-environment.
Subject: Environmentally-friendly inhibitor.
Subject: Metallic corrosion test-data.
Subject: Langmuir adsorption isotherm.
Date: 27 October 2016
Publisher: Metals
Description: This paper investigates Phyllanthus muellerianus leaf-extract effects on steel-reinforcement corrosion in concrete immersed in 3.5% NaCl, simulating saline/marine environment. Different concentrations of the leaf-extract were admixed in steel-reinforced concrete samples, which were immersed, with normal control, in the test-environment, while positive control samples were immersed in distilled water. Electrochemical measurements of corrosion-rate (by linear-polarizationresistance instrument), corrosion-current (by zero-resistance-ammeter) and corrosion-potential (by high impedance multimeter) were obtained for assessing the reinforcing-steel corrosion. Analyzed results showed that the corrosion-rate exhibited excellent correlation (R = 98.82%, Nash-Sutcliffe Efficiency = 97.66%, ANOVA p-value = 0.0006) with function of the admixture concentration and of the corrosion noise-resistance (ratio of corrosion-potential and corrosion-current standard deviations). The 0.3333% Phyllanthus muellerianus (per weight of cement) exhibited optimal efficiency, η = 97.58% ± 1.28% (experimental) or 95.33% ± 4.25% (predicted), at inhibiting concrete steel-reinforcement corrosion in the test-environment, which compares well with the positive control performance model, η = 97.96% ± 0.03%. The experimental and predicted models followed the Langmuir adsorption isotherm, which indicated physisorption as the Phyllanthus muellerianus leaf-extract adsorption mechanism on the reinforcing-steel. These support suitability of the N-, S-, and O-containing and π-electron rich Phyllanthus muellerianus leaf-extract as an environmentally-friendly inhibitor for effective corrosion-protection of steel-reinforcement in concrete designed for the saline/marine environment.

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collection(s): Department of Chemical and Metallurgical and Materials Engineering - Research Articles
Identifier: tut:5141
Format: PDF
Language: en
RightsHolder: MDPI
Type: Text
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Department of Chemical and Metallurgical and Materials Engineering - Research Articles Effects of Phyllanthus muellerianus leaf-extract on steel-reinforcement corrosion in 3.5% NaCl-immersed concrete.

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