Adsorption and Corrosion Inhibitive Properties of Novel Surfactants in the Series of Fatty Acids Based on Palm Oil on Carbon Steel in CO2-containing Solution
I. T. Ismayilov
Mamedaliev Institute of Petrochemical Processes, National Academy of Sciences of Azerbaijan, AZ1025 Baku, Azerbaijan and Faculty of Chemistry, Lomonosov Moscow State University, 119991, GSP-1, 1-3 Leninskiye Gory, Moscow, Russia
Hany M. Abd El-Lateef *
Mamedaliev Institute of Petrochemical Processes, National Academy of Sciences of Azerbaijan, AZ1025 Baku, Azerbaijan and Chemistry Department, Faculty of Science, Sohag University, 82524 Sohag, Egypt
V. M. Abbasov
Mamedaliev Institute of Petrochemical Processes, National Academy of Sciences of Azerbaijan, AZ1025 Baku, Azerbaijan
L. I. Aliyeva
Mamedaliev Institute of Petrochemical Processes, National Academy of Sciences of Azerbaijan, AZ1025 Baku, Azerbaijan
E. N. Efremenko
Faculty of Chemistry, Lomonosov Moscow State University, 119991, GSP-1, 1-3 Leninskiye Gory, Moscow, Russia
S. A. Mamedxanova
Mamedaliev Institute of Petrochemical Processes, National Academy of Sciences of Azerbaijan, AZ1025 Baku, Azerbaijan
*Author to whom correspondence should be addressed.
Abstract
Some novel surfactants in the series of fatty acids were synthesized based on palm oil. The inhibition efficiency (η %) of these surfactants has been studied by linear polarization corrosion rate and potentiodynamic polarization measurements in CO2-saturated brine at 50ºC. A significant decrease in the corrosion rate was observed in the presence of the investigated inhibitors. The percentage inhibition efficiency (η %) increases by increasing the inhibitor concentration. Potentiostatic polarization curves indicate that, the inhibitors under investigation act as mixed type. Tafel slopes are approximately constant and independent on the inhibitor concentration. The inhibition of carbon steel corrosion is due to the adsorption of the inhibitor molecules on the surface, which follows Langmuir adsorption isotherm. The changes in the surface morphology and composition of carbon steel samples with corrosion inhibitors were examined using Energy dispersive X-ray fluorescence (EDRF).
Keywords: Carbon steel, palm oil, surfactants, inhibition, EDRF