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Corrosion Inhibition of Pipeline Steels Under Supercritical CO2 Environment

In the present study, the performance of imidazoline-based corrosion inhibitor was evaluated by examining environmental effects on the corrosion rate and corrosion behavior of materials.

Product Number: 51317--9153-SG
ISBN: 9153 2017 CP
Author: Yoon-Seok Choi
Publication Date: 2017
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It has been reported that aqueous corrosion rate of carbon steel is very high under supercritical CO2 condition. In the present study the performance of imidazoline-based corrosion inhibitors was evaluated by examining environmental effects on the corrosion rate and corrosion behavior of materials. The tested parameters include material (X65 1Cr steel and 3Cr steel) temperature and type/concentration of inhibitors. The corrosion rate of samples was determined by electrochemical and weight loss measurements. The surface morphology and the composition of the corrosion product layers were analyzed by using surface analytical techniques (SEM and EDS). Results showed that the addition of corrosion inhibitor decreased corrosion rate significantly from 90 mm/y to below 0.1 mm/y at supercritical CO2 condition (12 MPa CO2 80oC). Corrosion rate of carbon steel in the CO2 saturated solution with the presence of inhibitor did not depend on the temperature. However corrosion inhibitor performed better for carbon steel than Cr containing steels in supercritical CO2 environment.

Key words: Supercritical/liquid CO2, CO2 corrosion, carbon steel, corrosion inhibitor

It has been reported that aqueous corrosion rate of carbon steel is very high under supercritical CO2 condition. In the present study the performance of imidazoline-based corrosion inhibitors was evaluated by examining environmental effects on the corrosion rate and corrosion behavior of materials. The tested parameters include material (X65 1Cr steel and 3Cr steel) temperature and type/concentration of inhibitors. The corrosion rate of samples was determined by electrochemical and weight loss measurements. The surface morphology and the composition of the corrosion product layers were analyzed by using surface analytical techniques (SEM and EDS). Results showed that the addition of corrosion inhibitor decreased corrosion rate significantly from 90 mm/y to below 0.1 mm/y at supercritical CO2 condition (12 MPa CO2 80oC). Corrosion rate of carbon steel in the CO2 saturated solution with the presence of inhibitor did not depend on the temperature. However corrosion inhibitor performed better for carbon steel than Cr containing steels in supercritical CO2 environment.

Key words: Supercritical/liquid CO2, CO2 corrosion, carbon steel, corrosion inhibitor

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08430 Corrosion of Materials in Supercritical CO2 Environments

Product Number: 51300-08430-SG
ISBN: 08430 2008 CP
Author: R. Ballinger, J. Lim, T. McKrell, and G. Eastwick
Publication Date: 2008
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