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Effect of impurity interaction on the corrosion film characteristics and corrosion morphology evolution of X65 steel in water-saturated supercritical CO2 system.

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Bibliographic Details
Title: Effect of impurity interaction on the corrosion film characteristics and corrosion morphology evolution of X65 steel in water-saturated supercritical CO2 system.
Authors: Sun, Chong1,2, Sun, Jianbo1 sunjianbo@upc.edu.cn, Wang, Yong1, Sui, Pengfei1, Lin, Xueqiang1, Liu, Huifeng1, Cheng, Xiangkun1, Zhou, Mingnan1
Source: International Journal of Greenhouse Gas Control. Oct2017, Vol. 65, p117-127. 11p.
Subject Terms: Supercritical carbon dioxide, Impurity-dislocation interactions, Corrosion & anti-corrosives testing, Water-saturated sites (Archaeology), Steel pipe
Abstract: The corrosion behavior of X65 steel in water-saturated supercritical CO 2 system containing NO 2 with or without O 2 , H 2 S and SO 2 impurities was investigated using weight loss measurement and surface analysis techniques. The interactions between NO 2 and O 2 , SO 2 or H 2 S promoted the formation of extra corrosive species and subsequently changed the corrosion film characteristics. In water-saturated supercritical CO 2 -NO 2 -O 2 -SO 2 -H 2 S system, FeSO 4 and S preferentially formed in the early corrosion stage due to the impurity interactions. As the corrosion time prolonged, (NH 4 )Fe 3 (SO 4 ) 2 (OH) 6 and FeOOH formed due to the subsequent reactions of the impurity interaction products, and S disappeared in the corrosion scale via participating in the subsequent corrosion reactions during long-term corrosion. Localized corrosion was initiated by the inhomogeneous precipitation of acid-rich water in the presence of NO 2 . However, the propagation rate of the corrosion pit in depth direction greatly reduced with time, and the corrosion morphology of X65 steel shifted from localized corrosion towards general corrosion during long-term corrosion. [ABSTRACT FROM AUTHOR]
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Database: GreenFILE
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Abstract:The corrosion behavior of X65 steel in water-saturated supercritical CO 2 system containing NO 2 with or without O 2 , H 2 S and SO 2 impurities was investigated using weight loss measurement and surface analysis techniques. The interactions between NO 2 and O 2 , SO 2 or H 2 S promoted the formation of extra corrosive species and subsequently changed the corrosion film characteristics. In water-saturated supercritical CO 2 -NO 2 -O 2 -SO 2 -H 2 S system, FeSO 4 and S preferentially formed in the early corrosion stage due to the impurity interactions. As the corrosion time prolonged, (NH 4 )Fe 3 (SO 4 ) 2 (OH) 6 and FeOOH formed due to the subsequent reactions of the impurity interaction products, and S disappeared in the corrosion scale via participating in the subsequent corrosion reactions during long-term corrosion. Localized corrosion was initiated by the inhomogeneous precipitation of acid-rich water in the presence of NO 2 . However, the propagation rate of the corrosion pit in depth direction greatly reduced with time, and the corrosion morphology of X65 steel shifted from localized corrosion towards general corrosion during long-term corrosion. [ABSTRACT FROM AUTHOR]
ISSN:17505836
DOI:10.1016/j.ijggc.2017.09.002