Anti-corrosive properties of Argan oil on C38 steel in molar HCl solution

Corrosion inhibition effect of Argan oil (AO) on corrosion of C38 steel in 1 M HCl solution was investigated using weight loss measurements, electrochemical polarization and EIS methods. Results obtained reveal that Argan oil acts as a mixed inhibitor without modifying the hydrogen reduction mechanism. The inhibition efficiency increases with increased Argan oil concentration to attain a maximum value of 81% at 3 g/L. The inhibition efficiency of Argan oil decreases with the rise of temperature. Argan oil is adsorbed on the steel surface according to Langmuir isotherm model. The parameters ( Ea∗, ΔHa∗, ΔG∗ΔG∗ and ΔSa∗) were estimated and discussed. The fundamental thermodynamic functions were used to glean important information about Argan oil’s inhibitory behavior.