Corrosion inhibition of steel by Prickly Pear: extraction, characterization and electrochemical studies

Aqueous and Methanolic extracts of Prickly Pear was tested as a corrosion inhibitor for mild steel using electrochemical impedance spectroscopy (EIS) in two different media.Impedance measurements showed that there are two phenomena in the inhibition process.The obtained results show that this plant extract could serve as an effective inhibitor for corrosion of steel in NaOH solutions with different NaCl content.The aqueous extract obtained gives inhibition around 96.9% in 0.1 M NaOH solution and the methanolic extract provided about 88.3% inhibition efficiency in 0.1 M NaOH+0.5 M NaCl solution.The EIS experimental data show frequency dispersion and therefore a modeling element with frequency dispersion behavior, a constant phase (CPE) has been used.