Abstract
The effect of addition of argan Kernels extract (AKE) and cosmetic argan oil (CAO) on the corrosion of steel in 1M HCl acid has been studied by weight loss measurements, potentiodynamic polarisation and Electrochemical Impedance Spectroscopy (EIS) measurements. The inhibition efficiency was found to increase with inhibitors content to attain 96% and 91% for AKE (at 3g/L) and CAO (at 6g/L) respectively. Data obtained from EIS studies were analyzed to determinate the model inhibition process through appropriate equivalent circuit models. Inhibition efficiency E (%) obtained from the various methods is in good agreement. The temperature effect on the corrosion behaviour of steel in 1M HCl was studied by potentiodynamic technique in the range from 398 to 328 K. The associated activation energy has been determined. The adsorption of natural products on the steel surface was found obey to Langmuir's adsorption isotherm.