Inhibition Performance of an Oil Field Inhibitor in H₂S/CO₂ Saturated 3% NaCl Solution

The inhibition performance of an imidazoline derivative inhibitor for carbon steel in CO2/H2S saturated 5% NaCl solution at 60 ℃ was investigated by potentiodynamic polarization and weight loss measurements, and the surface analysis of carbon steel was performed by SEM and EDS. Results showed that the inhibitor CI-03, acting as an anodic-type inhibitor, could inhibit the corrosion of carbon steel in simulation solution significantly. Its adsorption on the metal surface obeys Langmuir adsorption isotherm. The inhibitor could form a product film on the metal surface by adsorption, which brought on high protection performance for carbon steel.