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The new complex surfactants were synthesized based on sunflower oil and its inhibiting action on the corrosion of carbon steel in CO2-saturated oilfield formation water was investigated by means of weight loss and linear polarization resistance corrosion rate. The results revealed that the studied surfactants were excellent inhibitors. The percentage inhibition efficiency (IE %) increases by increasing the inhibitor concentration until the critical micelle concentration (CMC) is reached. The strong adsorption ability of the surfactant molecules leads to formation of a mono-layer, which isolates the surface from the environment and thereby reduces the corrosion attack on the surface. The adsorption process was found to obey the Langmuir adsorption isotherm.

Some surfactants based on the vegetable oils as CO2 corrosion inhibitors for mild steel in oilfield formation water