Add time:09/07/2019         Source:sciencedirect.com

The corrosion of steels in the supercritical CO2 environment with impurities in a carbon capture, utilization and storage system has attracted great interests in recent years. In this work, corrosion inhibition mechanisms of the residual 2-amino-2-methyl-1-propanol and piperazine from the CO2 capture process on X80 steel within an impure supercritical CO2 environment were investigated by weight-loss method and surface analysis techniques. The results showed that a small amount of 2-amino-2-methyl-1-propanol had marginal effect on the corrosion of steel. Corrosion rate was decreased as the 2-amino-2-methyl-1-propanol concentration increased further. When 100 ppm 2-amino-2-methyl-1-propanol + 50 ppm piperazine was added, a lowest corrosion rate was observed, reaching 0.41mm/a. Meanwhile, pitting corrosion was observed under all conditions. The combination of 2-amino-2-methyl-1-propanol and piperazine cannot inhibit pitting corrosion efficiently, while flow accelerated the propagation of pits in the presence of 2-amino-2-methyl-1-propanol. FeSO4 was confirmed as the corrosion product for all conditions. RNH3+, PZH+, Fe2O3 and Fe3O4 were detected in the corrosion products depending on the test conditions. The results indicated that the inhibition mechanism of piperazine and 2-amino-2-methyl-1-propanol was attributed to both the neutralization and adsorption effects on the steel surface. A non-uniform adsorption inhibition mechanism is proposed based on these test results.

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