Abstract

Ayssar Nahlé^1*, Yassir El Ouadi², Abdelhamid Bouyanzer², Lhou Majidi³, Julien Paolini⁴, Jean Marie Desjobert⁴, Jean Costa⁴, Nabila Chahboun^5,6, Abdelkader Zarrouk² and Belkheir Hammouti²

DOI : http://dx.doi.org/10.13005/ojc/320417

The extract (E) and oil of Melissa Officinalis leaves (EO) have been evaluated as a corrosion inhibitors for carbon steel in 1.0 M HCl solution by means of weight loss measurements, potentio dynamic polarization, and electro chemical impedance spectroscopy (EIS). Tafel polarization study revealed that extract (E) and oil of Melissa Officinalis (EO) act as a mixed type inhibitors. The Nyquist plots showed that with increasing the inhibitors concentrations, the charge-transfer resistance increased and the double-layer capacitance decreased, involving increased inhibition efficiency. The inhibition was found to increase with increasing the concentration of the extract (E) and oil of Melissa Officinalis (EO). The values of inhibition efficiency calculated from weight loss, Tafel polarization curves, and EIS were in good agreement. The effect of temperature on the corrosion behaviour of mild steel in 1.0 M HCl with addition of both extract (E) and oil of Melissa Officinalis (EO) was also studied and thermodynamic parameters were determined and discussed.

Corrosion inhibition; Carbon steel; Melissa Officinalis; Extract, Oil; Electrochemical techniques

[ View HTML Full Text]