Aniba canelilla as corrosion inhibitor of carbon steel

Abstract

Natural products stand out as a corrosion inhibitor source. The species Aniba canelilla (HBK) Mez, popularly known as "casca preciosa", belongs to the Lauraceae family. This botanical family is known by its alkaloid presence. Amazonian A. canelilla ethanolic extract was analysed by mass spectrometry and evaluated as a corrosion inhibitor of carbon steel (UNS G10200) in H2SO4 1.0 mol.L-1. The mass spectrometry identified the presence of alkaloid reticuline and Nmethyl-clocaurine in the extract. Polarization curve and electrochemical impedance spectroscopy were used to evaluate the inhibition effect. It was observed a maximum reduction of 86.9 % in the corrosion current density and an increase of 76.0 % in charge transfer resistance indicating an inhibition of corrosion for concentration of 300 mg.L-1. The weight loss showed an inhibition of 83.9 % in the corrosion rate.