Experimental and Theoretical Evaluation of Allicin as Corrosion Inhibitor for Carbon Steel in Sulfuric Acid

The use of allicin as green corrosion inhibitor for 1018 carbon steel in 0.5 m sulfuric acid has been evaluated by using potentiodynamic polarization curves,and electrochemical impedance spectroscopy (eis) measurements. tests were carried out under static and dynamic conditions in a concentration range from 0 to 800 ppm. results show that allicin is a good mixed type of corrosion inhibitor with its efficiency increasing with an increase in its concentration up to 400 ppm and it decreased with a further increase in its concentration. inhibitor efficiency decreases with an increase in the testing temperature,but it increases also as time elapsed or by enhancing the mass transport. theoretical calculations have been performed by using density functional theory (dft) in order to know the relationship between the electronic properties of allicin and its inhibitive effect. © 2017,university of mohammed premier oujda morocco.