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51318-11085-Comparison of corrosion behaviour of X65 steels in water-containing supercritical CO2 environments with NO2/O2

Picture for Comparison of corrosion behaviour of X65 steels in water-containing supercritical CO2 environments with NO2/O2
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 Corrosion experiments on X65 carbon steel in water-saturated supercritical CO2 (SC-CO2) and under-saturated SC-CO2 conditions at 80 bar and 35°C in the absence and presence of various combinations of NO2 and O2 ranging from 0-100 ppm and 0-1000 ppm, respectively.

 

Product Number: 51318-11085-SG
Author: Yong Hua / Richard Barker / Anne Neville
Publication Date: 2018
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$20.00
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Corrosion experiments were performed on X65 carbon steel in water-saturated supercritical CO2 (SC-CO2) and under-saturated SC-CO2 conditions at 80 bar and 35°C in the absence and presence of various combinations of NO2 and O2 ranging from 0-100 ppm and 0-1000 ppm, respectively. The purpose of the experiments was to understand the implications of the presence of these two species on both general and localized corrosion in likely conditions encountered during CO2 transport.

The presence of 100 ppm NO2 and 1000 ppm O2 in water-saturated SC-CO2 resulted in general corrosion rates reaching 0.3 mm/year after 48 hours and a localized corrosion rate of 6.8 mm/year, compared to 0.1 and 0.92 mm/year, respectively in the absence of both species. The final stages of testing considered corrosion rates in under-saturated SC-CO2 with 100 ppm NO2 and 1000 ppm O2 at water contents between 0 and 1770 ppm. Although no corrosion occurred in dry conditions, increasing water concentration from 300 to 1770 ppm resulted in the general corrosion rates rising from 0.05 to 0.68 mm/year. However, there was no significant difference in the extent of localized corrosion observed with changing water content over this range, with values ranging between 0.5 and 0.6 mm/year.

Key words: corrosion, NO2, O2

 

 

Corrosion experiments were performed on X65 carbon steel in water-saturated supercritical CO2 (SC-CO2) and under-saturated SC-CO2 conditions at 80 bar and 35°C in the absence and presence of various combinations of NO2 and O2 ranging from 0-100 ppm and 0-1000 ppm, respectively. The purpose of the experiments was to understand the implications of the presence of these two species on both general and localized corrosion in likely conditions encountered during CO2 transport.

The presence of 100 ppm NO2 and 1000 ppm O2 in water-saturated SC-CO2 resulted in general corrosion rates reaching 0.3 mm/year after 48 hours and a localized corrosion rate of 6.8 mm/year, compared to 0.1 and 0.92 mm/year, respectively in the absence of both species. The final stages of testing considered corrosion rates in under-saturated SC-CO2 with 100 ppm NO2 and 1000 ppm O2 at water contents between 0 and 1770 ppm. Although no corrosion occurred in dry conditions, increasing water concentration from 300 to 1770 ppm resulted in the general corrosion rates rising from 0.05 to 0.68 mm/year. However, there was no significant difference in the extent of localized corrosion observed with changing water content over this range, with values ranging between 0.5 and 0.6 mm/year.

Key words: corrosion, NO2, O2

 

 

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