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Corrosion inhibition of 304 stainless steel (SS) in 1 M HCl by aqueous extract of coriander seeds was studied using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modu- lation (EFM) techniques. Values of inhibition efficiency obtained are dependent upon the concentration of extract and temperature. Gen- erally, inhibition was found to increase with inhibitor concentration, but decrease with temperature. Physical adsorption mechanism has been proposed for the inhibition with Langmuir adsorption isotherm obeyed. Values of activation energy of the inhibited cor- rosion reaction of 304 SS are greater than the value obtained for the blank. Thermodynamic consideration reveals that adsorp- tion of aqueous extract of coriander seeds 304 SS surface is spontaneous.

Aqueous Extract of Coriander Seeds as Green Corrosion Inhibitor for 304 Stainless Steel in Hydrochloric Acid Solutions