Corrosion Inhibition of Cast Iron in Arabian Gulf Seawater by Two Different Ionic Liquids

El-Sayed M Sherif; Hany S Abdo; Sherif Zein El Abedin

doi:10.3390/ma8073883

Corrosion Inhibition of Cast Iron in Arabian Gulf Seawater by Two Different Ionic Liquids

Materials (Basel). 2015 Jun 26;8(7):3883-3895. doi: 10.3390/ma8073883.

Authors

El-Sayed M Sherif^{1

2}, Hany S Abdo^{3

4}, Sherif Zein El Abedin^{5

6}

Affiliations

¹ Deanship of Scientific Research (DSR), Center of Excellence for Research in Engineering Materials (CEREM), Advanced Manufacturing Institute (AMI), King Saud University, P.O. Box 800, Al-Riyadh 11421, Saudi Arabia. esherif@ksu.edu.sa.
² Electrochemistry and Corrosion Laboratory, Physical Chemistry Department, National Research Centre, El Bohouth St. 33, Dokki, Giza 12622, Egypt. esherif@ksu.edu.sa.
³ Deanship of Scientific Research (DSR), Center of Excellence for Research in Engineering Materials (CEREM), Advanced Manufacturing Institute (AMI), King Saud University, P.O. Box 800, Al-Riyadh 11421, Saudi Arabia. habdo@ksu.edu.sa.
⁴ Mechanical Design and Materials Department, Faculty of Energy Engineering, Aswan University, Aswan 81521, Egypt. habdo@ksu.edu.sa.
⁵ Electrochemistry and Corrosion Laboratory, Physical Chemistry Department, National Research Centre, El Bohouth St. 33, Dokki, Giza 12622, Egypt. sherif.zein@tu-clausthal.de.
⁶ Institute of Electrochemistry, Clausthal University of Technology, Arnold-Sommerfeld-Str. 6, Clausthal-Zellerfeld D-38678, Germany. sherif.zein@tu-clausthal.de.

Abstract

In this paper we report on the corrosion inhibition of cast iron in Arabian Gulf seawater by two different ionic liquids namely, 1-ethyl-3-methylimidazolium chloride ([EMIm]Cl) and 1-butyl-1-methylpyrrolidinium chloride ([Py_1,4]Cl). The inhibiting influence of the employed ionic liquids was investigated by weight loss, open circuit potential electrochemical impedance spectroscopy, and cyclic potentiodynamic polarization. The results show the corrosion inhibition impact of the employed ionic liquids (ILs). Compared with [Py_1,4]Cl, [EMIm]Cl shows a higher inhibition efficiency at a short immersion time, for the examined ILs concentrations. However, [Py_1,4]Cl exhibits a higher efficiency upon increasing the immersion time indicating the persistence of the inhibiting influence. The corrosion inhibition of the employed ionic liquids is attributed to the adsorption of the cations of the ionic liquids onto the surface of cast iron forming a corrosion barrier.

Keywords: cast iron; corrosion; inhibitors; ionic liquids; seawater; weight-loss.