A Study of <i>Eruca vesicaria</i>, <i>Bromelia hemisphaerica</i> and <i>Erythrina americana</i> as Green Corrosion Inhibitors for Carbon Steel in Sulfuric Acid

Abstract

A study of Eruca vesicaria, Bromelia hemisphaerica and Erythrina americana as eco-friendly corrosion inhibitors for 1018 carbon steel in 0.5 M H 2 SO 4 has been carried out by using weight loss tests, potentiodynamic polarization curves and electrochemical impedance spectroscopy measuremnts. Results have shown that the three extracts performed as good corrosion inhibitors, but the Eruca vesicaria exhibited the best performance followed by Erythrina americana. The three inhibitors formed a protective, passive film which protected the steel from corrosion. This was because they contain antioxidants present in their molecular structure with heteroatoms such as N, C and O like phenols, amino acids, etc., which react with metal and environment to form the protective film.

Evaluation of the endocarp and epicarp extract of Cereus fricii cactus as a carbon steel corrosion inhibitor

“…In previous studies have analyzed the interaction of these groups with the metal surface, the OHfunctional group can protect steel coupons against corrosion by the interaction of the corrosive medium and metal, reacting with Fe 3+ ions to form chelates with iron responsible for the corrosion inhibitory capacity of carbon steel exposed to different corrosive media, this is due to the ortho-position of the OH-group in aromatic rings [11]. In the case of amines, they have been found to generate a layer on the metal to protect it from the exposed corrosive environment and thus protect it [15].…”