Corrosion Inhibition of Iron in Sulphuric Acid Solutions by Antibacterial Cephalosporin
M. Abdallah(1) A. S. Fouda (2), I. Zaafarany (1), A. Fawzy (1,3)and Y. Abdaalah (2)
1 Department of Chemistry, Faculty of Applied Science, Umm Al-Qura University,Saudi Arabia.
2Department of Chemistry, Faculty of Science, Mansoura University, Egypt
3Chemistry Department, Faculty of Science, Assiut University, Assiut 71516, Egypt.
Abstract: The inhibitive effects of some antibacterial cephalosporin (cefotaxime, cefalexin, cefradine and cefazolin) on the corrosion of iron in 0.5 M H2SO4 solution was investigated using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. Results showed that the inhibition efficiency increased with an increase in concentration of inhibitor. Potentiodynamic studies proved that the inhibitors act as mixed type .The inhibitors are adsorbed on the iron surface according to Langmuir isotherm equation. All impedance spectra in EIS tests exhibit one capacitive loop which indicates that the corrosion reaction is controlled by charge transfer process. Inhibition efficiencies obtained from Tafel polarization, charge transfer resistance (Rct) is consistent.
[M. Abdallah, A. S. Fouda , I. Zaafarany , A. Fawzy and Y. Abdaalah. Corrosion Inhibition of Iron in Sulphuric Acid Solutions by Antibacterial Cephalosporin. J Am Sci 2013;9(3):209-215](ISSN:1545-1003).http://www.americanscience.org. 28
Keywords: Iron, antibacterial cephalosporin, corrosion inhibitors. Full Text 28