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Vol. 27, Special Issue, May 2014, pp. 326-335




Synergistic Effect of L-Methionine and KI on Copper Corrosion Inhibition in HNO3 (1M)


Laboratoire d’Ingénierie des Surfaces (LIS) -Université Badji Mokhtar, BP. 12 - 23000 Annaba, Algérie

E-mail: abderrahmanesihem@yahoo.fr


Received: 23 November 2013 /Accepted: 12 January 2014 /Published: 26 May 2014

Digital Sensors and Sensor Sysstems


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.


Keywords: Corrosion, Copper, L-methionine, KI, Synergistic effects.


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