Abstract

L-Methionine (L-Met) efficiency as a non-toxic corrosion inhibitor for copper in 1M HNO3 has been studied by using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. Copper corrosion rate significant decrease was observed in the presence of L-Met at 10-4M. The obtained Results from potentiodynamic polarization and impedance measurements are in good agreement. L-Methionine adsorption on copper surface follows Langmuir isotherm. L-Met free energy adsorption on copper (−30 KJ mol−1) reveals an inhibition strong physical adsorption on copper surface. In order to evaluate the L-Met effect, L-Met and iodide ion’synergistic effect was used to prevent copper corrosion in nitric acid. It was found that inhibitor efficiency (IE) reached 98.27 % in 1M solution containing 10-4M L-Met and 10-3 M KI. The synergistic effect was attributed to iodide ions adsorption on copper surface, which facilitated the L-Met adsorption and an inhibitive film formation.

Information

Item Type:	Journal
Divisions:
ePrint ID:	1964
Date Deposited:	2019-10-19
Further Information:	Google Scholar
URI:	https://www.univ-soukahras.dz/en/publication/article/1964

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