Eco-friendly chamaerops humilis l. Fruit extract corrosion inhibitor for mild steel in 1 M HCL

Abstract

Given the great interest in the application of medicinal and aromatic plants in several fields, including the control of corrosion of metals in different environments and in order to minimize the use of synthetic inhibitors, this is the objective of our research. In this work, ethanol and hexane extracts of Chamaerops humilis L. fruits were investigated as green corrosion inhibitors for mild steel in 1 M HCl solution. Corrosion rates were evaluated at 308 K using weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. Electrochemical techniques reveal that ethanol and hexane extracts exhibit excellent inhibition efficiency indicated that the corrosion mechanism is controlled by charge transfer process and function as mixed type inhibitors at temperature studied. Adsorption studies showed that the process follows the Langmuir adsorption isotherm. The weight loss measurements show that ethanol and hexane extracts of Chamaerops humilis L. fruits are excellent inhibitors in 1 M HCl medium and its inhibition efficiency (%IE) increases with an increase in the concentration of the inhibitors and reaches 88% and 80% at concentrations of 1 g/l of ethanol and hexane extracts, respectively. The mechanism for inhibiting corrosion of mild steel by ethanol and hexane extracts of Chamaerops humilis L. fruits has been proposed.