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

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).