Abstract: Different characterization techniques were employed for understanding anticorrosion prospect of Irvingia gabonensis leaf-extract on steel-reinforcement. FTIR spectroscopy showed that this leaf- extract is constituted of N-, S-, O-, Hg- containing heteroatoms having π-electron ligands that usually exhibit affinity for steel-rebar Fe constituent. AAS indicates Irvingia gabonensis leaf inorganic composition includes Ni, Cu, Cd, Fe, but neither Pb nor Cr, and with the low/non-toxic heavy metal levels supporting the natural-plant’s eco-friendliness. Phytochemical-screening showed that the leaf-extract is rich in glycosides (known for steel corrosion-protection in NaCl) and in saponnins, with traces of flavonoids, stenoids and terpenoids. Anticorrosion prospect investigation, via the leaf-extract admixture in 3.5% NaCl-immersed steel-reinforced concretes, showed that corrosion-inhibition performance increased with increasing leaf-extract concentrations. By statistical modeling of the electrochemical/corrosion test-data, the lower Irvingia gabonensis leaf-extract concentrations aggravated corrosion, indicating insufficient admixture usage, while the higher concentrations exhibited η > 80% corrosioninhibition efficiencies, suggesting sufficient bio-constituent combinations for corrosion-mitigation.
Authors: Joshua Olusegun Okeniyi and Abimbola Patricia Idowu Popoola
Keywords: Biochemical Characterization, Eco-Friendly Corrosion Inhibitor, Anticorrosion Prospect On Concrete Steel-Reinforcement, Fourier Transform Infra Red Spectroscopy, Atomic Absorption Spectroscopy, Phytochemical Screening