Corrosion Inhibition and Adsorption Effect of Rosinyl Imidazolium Quaternary Ammonium Salt on Steel in CO_2-saturated NaCl solution

Rosinyl imidazolium was synthesized using rosin and diethylenetriamine,and then was modified to produce water soluble quaternary ammonium salt by sodium monochloroacetate.The corrosion inhibition effect of the quaternary ammonium salt was investigated by mass loss and electrochemical methods for mild steel in CO2-saturated 3% NaCl solution at 60 ℃.The results showed that the water soluble rosinyl imidazolium quaternary ammonium salt showed excellent corrosion inhibition for mild steel,with an inhibition efficiency above 90% for a dose of 150 mg/L.The inhibitor mainly prohibited the anodic process of corrosion and the inhibition effect obeyed the Langmuir adsorption isothermal equation.The inhibitor could be adsorbed on the surface of steel by chemical adsorption.