Use of a non-ionic gemini-surfactant synthesized from the wasted avocado oil as a CO2- corrosion inhibitor for X-52 steel

Abstract A non-ionic gemini surfactant, namely N,N- diethylaminedialkyldiamide, was synthesized from the fatty acids contained in wasted avocado oil and used as green inhibitor for the CO 2 corrosion of API X-52 steel under static and dynamic conditions at 50 °C by using electrochemical techniques. Tests lasted 24 h, and inhibitor concentration included 0, 10, 25 and 50 ppm. Results have shown that N,N- diethylaminedialkyldiamide is a good corrosion inhibitor that is physically adsorbed on to the steel by following a Langmuir adsorption isotherm to protect it. It affected both the anodic and cathodic reactions. Under dynamic conditions, the corrosion rate increased in both uninhibited and inhibited solutions because the mass transfer of reactants towards the metal surface is enhanced, and because the formed protective corrosion products layer is detached from the steel surface.