Corrosion Inhibition of C38 Steel in 1M HCl Media By Amazonian Tree Alkaloidic Extract: Electrochemical and Phytochemical Study of Xylopia Frutescens Aubl

The present report continues to focus on the broadening application of plant extracts for metallic corrosion control [1and 2] and reports on the inhibiting effect of the Xylopia frutescens alkaloidic extract on the corrosion of C38 steel in 1 M hydrochloric acid. This extract presents mainly aporphinoid alkaloids, with nitrogen, oxygen, and aromatic rings. The corrosion inhibition’s is studied by polarization curves and electrochemical impedance spectroscopy (EIS). Constant phase element parameters of EIS are graphically calculated for better data precision. Studies on the phytochemical constituents of the total extract were also established and the active(s) molecule(s) are identified by NMR spectroscopy.

The total alkaloid extract of Xylopia frutescenswas found to be an inhibitor for C38 steel corrosion in 1 M HCl solution and its inhibition efficiency increased with increasing concentration. The study showed that the inhibition behavior of the crude extract is due to the presence of aporphinoid alkaloids in the crude extract.

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2- M. Chevalier, et al., Enhanced corrosion resistance of mild steel in 1 M hydrochloric acid solution by alkaloids extract from Aniba rosaeodora plant: Electrochemical, phytochemical and XPS studies, Electrochim. Acta (2013), http://dx.doi.org/10.1016/j.electacta.2013.12.023