IJE TRANSACTIONS A: Basics Vol. 20, No. 1 (February 2007) 35-44   

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A. Khavasfar

Department of Materials Science and Metallurgical Engineering
Shahid Bahonar University of Kerman, Kerman, Iran

M. H. Moayed*

Department of Materials and Metallurgical Engineering, Faculty of Engineering
Ferdowsi University of Mashhad, P.O. Box 91775-1111, Mashhad, Iran

A. H. Jafari

Department of Materials Science and Metallurgical Engineering
Shahid Bahonar University of Kerman, Kerman, Iran

*Corresponding Author

( Received: December 11, 2005 – Accepted in Revised Form: January 18, 2007 )

Abstract    The performance of an Imidazoline based commercial corrosion inhibitor on CO2 corrosion of mild steel was investigated in a Cl- containing solution employing linear polarization resistance (LPR), potentiodynamic polarization and monitoring corrosion potential techniques. Experimental results showed that an increase of the commercial inhibitor concentration up to 500 ppm increases the RP value and produces an efficiency of 90 percent. The increase of a test solution temperature at 60°C caused an increase on RP value compared to RP measured at room temperature this suggests adsorption of the inhibitor is promoted by temperature. Plot of c/θ versus inhibitor concentration (c) using different methods showed a straight line with a slope very close to unity, indicating that adsorption of the investigated commercial inhibitor on steel/saturated CO2 solution obeys the Lungmuir adsorption isotherm.


Keywords    CO2 Corrosion, Corrosion Inhibitor, Linear Polarization Resistance, Potentiodynamic Polarization, Lungmuir Adsorption Isotherm



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