Abstract
The corrosion inhibition performance of 2-mercaptobenzothiazole (MBTH) for carbon steel in a CO2-H2O system was investigated by weight loss, surface analysis, electrochemical measurements, and quantum chemical calculations. Results showed that MBTH could effectively protect carbon steel from CO2 corrosion and inhibition efficiency of MBTH in supercritical CO2 was higher than that in non-supercritical CO2 situation. The differential capacitance curves revealed that excess positive charges would be on the surface of carbon steel in the supercritical-CO2 system while negative charges accumulated on carbon steel surface in non-supercritical CO2 condition. The adsorption model was proposed to explain the inhibition mechanism of MBTH.
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