Investigation the Effect of Safflower Extract as a Green Inhibitor for Corrosion Inhibition of Mild Steel in 0.1 M HCl Solution

In this research, safflower extract was used as a green inhibitor in 0.1 M HCl solution to evaluate the rate of corrosion of mild steel in this environment. At the first step, the extract of fresh safflower plant (SPE) was prepared. The chemical structure of SPE was recognized by Fourier Transform Infrared Spectroscopy (FTIR). At the second step the solution of 0.1 M HCl containing 500 ppm SPE was prepared and in the next step the corrosion inhibition performances of the extract solution were proved by means of electrochemical impedance spectroscopy (EIS) technique and potentiodynamic polarization measurement then the result of these analyses was compared to the result of the dipped mild steel sample in the 0.1 M HCl solution without inhibitor. The morphology of the mild steel surface immersed in the extract solutions was evaluated by scanning electron microscopy (FE-SEM). According to the EIS results, the significant increment was observed in corrosion inhibition of acidic solution containing SPE in comparison with Blank solution. The result of potentiodynamic polarization measurement showed this green inhibitor acted as a mixed type inhibitor.