Table of Contents
ISRN Metallurgy
Volume 2012, Article ID 892385, 15 pages
http://dx.doi.org/10.5402/2012/892385
Research Article

Sweet Corrosion Inhibition on API 5L-B Pipeline Steel

1Department of Metallurgical and Material Engineering, Faculty of Petroleum and Mining Engineering, Suez Canal University, Suez, Egypt
2Department of Physical Chemistry, Faculty of Science, Mansoura University, Mansoura, Egypt
3Department of Integrity Management, United Gas Derivatives Company (UGDC), Port Said, Egypt

Received 20 September 2012; Accepted 11 October 2012

Academic Editors: M. Carboneras and Y. S. Chang

Copyright © 2012 Mahmoud Abbas Ibraheem et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Corrosion inhibition and adsorption behavior of two triazole derivatives on API 5L-B carbon steel in CO2-saturated 3.5% NaCl solutions was investigated using potentiodynamic polarization, EIS, and EFM techniques. Specimen surfaces were characterized using SEM, EDX, and XRD. Results show that the two compounds are mixed-type inhibitors and inhibition efficiency increases with increasing concentrations. Adsorption of the two compounds chemisorption and obeys Langmuir adsorption isotherm. Activation energy and thermodynamic parameters were calculated. Surface analyses confirm the formation of iron nitrides on the metal surface which supports results obtained from previous techniques.