Premium
Modeling steel corrosion under supercritical CO 2 conditions
Author(s) -
Zhang Y.,
Gao K.,
Schmitt G.,
Hausler R. H.
Publication year - 2013
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201106382
Subject(s) - supercritical fluid , corrosion , carbon steel , brine , materials science , mist , phase (matter) , metallurgy , aqueous solution , carbon dioxide , thermodynamics , chemistry , meteorology , physics , organic chemistry
Corrosion in the presence of CO 2 was studied under supercritical conditions (high pressure and moderate temperature) using different carbon steels and various corrosion resistant alloys (CRA's). An objective of this work was, among others, to put the results in perspective relative to various CO 2 corrosion models that have been developed and published over the years. In particular, the NORSOK, FREECORP, and OLI models were used for comparison, while others were discussed as well. The systems investigated were (a) supercritical CO 2 (SC CO 2 ) saturated with water (no separate water phase), (b) a water mist phase in equilibrium with SC CO 2 , (c) a water/brine phase in equilibrium with SC CO 2 . It was found that the OLI model best simulates the experimental corrosion rates observed in system (c) where coupons were corroded in the aqueous phase at high velocities in the rotating cage. The varying susceptibility of different carbon steels to corrosion under these conditions is highlighted. CRA steels are comparatively more resistant.