Punica Plant extract as Green Corrosion inhibitor for C-steel in Hydrochloric Acid Solutions

Punica Plant extract was studied as green corrosion inhibitor for carbon steel in 1 M HCl solutions by the potentiodnamic polarization, AC electrochemical impedance spectroscopy (EIS), potentiodnamic anodic polarization, scanning electron microscope (SEM). The obtained results showed that the inhibition efficiency of this extract increased by increasing the concentration and decreased by raising the temperature. Langmuir adsorption isotherm fits the experimental data for the studied extract. The effect of temperature on the corrosion rate was studied at temperature range 30-50°C. Thermodynamic parameters of activation and adsorption were calculated and discussed. The results showed that this extract acted as mixed type inhibitor but cathode is more polarized when an external current was applied. The mechanism of the inhibition process was determined using electrochemical techniques.

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