Investigation of Tarragon Extract as an Effective Inhibitor to Prevent Corrosion of Mild Steel in Acidic Environment

In the present study, the effect of Tarragon (Artemisia Dracunculus) extract as a green corrosion inhibitor on st37 carbon steel in 1M sulfuric acid and 0.5M hydrochloric acid was investigated using potentiodynamic polarization, electrochemical impedance spectroscopy, and scanning electron microscopy. Potentiodynamic polarization measurements showed that the inhibitor is a complex type and, with an increase in the concentration of inhibitor the corrosion rate was decreased. The results of the potentiodynamic polarization and electrochemical impedance methods were in agreement. The results of TOEFL and EIS measurements revealed that the adsorption of Tarragon extract on carbon steel in 0.5 M hydrochloric acid solution and 1M sulfuric acid was followed with the same temperature. Furthermore, the inhibition efficiency of the extract was higher in sulfuric acid rather than that in hydrochloric acid medium.