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

대한화학회지 2014년 58권 1호 p.25 ~ 32
 ( Fouda Abd El-Aziz. S. ) - El-Mansoura University Faculty of Science Department of Chemistry

 ( Rashwan Salah M. ) - Suez Canal University Faculty of Science Chemistry Department
 ( Abo-Mosallam Hytham A. ) - Water and Wastewater Company

Abstract


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 modulation (EFM) techniques. Values of inhibition efficiency obtained are dependent upon the concentration of extract and temperature. Generally, 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 corrosion reaction of 304 SS are greater than the value obtained for the blank. Thermodynamic consideration reveals that adsorption of aqueous extract of coriander seeds 304 SS surface is spontaneous.

키워드

Corrosion; Coriander seed extract; 304 SS; Langmuir adsorption isotherm
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