Title: Bio-characterisation of Solanum aethiopicum leaf: prospect on steel-rebar total-corrosion in chloride-contaminated-environment

Authors: Joshua Olusegun Okeniyi; Elizabeth Toyin Okeniyi; Taiwo Felicia Owoeye

Addresses: Mechanical Engineering Department, Covenant University, Ota 112001, Nigeria ' Petroleum Engineering Department, Covenant University, Ota 112001, Nigeria ' Department of Chemistry, Covenant University, Ota 112001, Nigeria

Abstract: This paper investigates biochemical constituents of Solanum aethiopicum leaf, for its prospect on the total-corrosion reduction of concrete steel-rebar in the chloride-contaminated environment. Atomic absorption spectroscopy (AAS) and Fourier transform infra-red (FTIR) spectroscopy were used for assessment of inorganic and organic constituents of the leaf. Steel-rebar total-corrosion was analysed, as per ASTM G109-99a, from macrocell-current measurements in 3.5% NaCl-immersed steel-reinforced concrete samples that were admixed with different concentrations of the Solanum aethiopicum leaf-extract. By AAS, Solanum aethiopicum leaf was characterised of inorganic constituents Fe = 4645.50 μg/g, Pb = 74.1138 μg/g, Ni = 43.1162 μg/g, Cd = 6.8425 μg/g, Cu = 0.004581 μg/g and Cr = 0.0000 μg/g. By FTIR, the plant was characterised with S-, N-, O- (and a trace of Hg-) containing organic hetero-atoms. Also, the different concentrations of Solanum aethiopicum leaf-extract admixture studied reduced steel-rebar total-corrosion, with physisorption mechanism, in the 3.5% NaCl-immersed steel-reinforced concrete specimens relative to a sample without admixture.

Keywords: Solanum aethiopicum; biochemical characterisation; total corrosion modelling; steel rebar corrosion; eco-friendly corrosion protection; chloride contaminated environment.

DOI: 10.1504/PIE.2016.083923

Progress in Industrial Ecology, An International Journal, 2016 Vol.10 No.4, pp.414 - 426

Received: 26 Mar 2016
Accepted: 02 Nov 2016
Published online: 26 Apr 2017 *

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