Abstract: The performance of 1,3-bis(benzimidazol-2-yl)-2-oxapropane as corrosion inhibitor for N80 steel oil pipeline was studied, using TGA to evaluate its thermal stability and by determining Tafel polarization curves to observe the effect of inhibitor dosage on corrosion inhibition rate in CO2 saturated solution, its corrosion inhibition mechanism was discussed briefly as well. Test results showed that said corrosion inhibitor possessed excellent thermal stability, and under an inhibitor concentration of 1 mmol/L, its corrosion inhibition rate could reach 87.84 %. The Langmuir adsorption isotherm demonstrated that the inhibitor formed a protective film on the metal surface through physicochemical adsorption, as a result the metal corrosion was slow down.

Key words: 1,3-bis(benzimidazol-2-yl)-2-oxapropane, polarization curve, adsorption isotherm, corrosion Inhibitor