Abstract
The inhibition effect of some environmentally complex Surfactants as inhibitors on the corrosion of carbon steel in CO2-saturated oilfield formation water has been studied by weight loss and linear polarization resistance corrosion rate methods. The results show that, the studied surfactants are a good inhibitor in oil field formation water containing CO2, and the inhibition efficiency (IE %) increases with the inhibitor concentration until the critical micelle concentration (CMC) is reached. The strong adsorption ability of the surfactant molecules leads to formation of a monolayer, which isolates the surface from the environment and thereby reduces the corrosion attack on the surface. The adsorption of inhibitor on the C-steel surface obeys the Langmuir adsorption isotherm equation