Corrosion studies on casing steel in CO2 storage environments
article
The corrosion behavior of casing steel N80 in brine plus CO2 was studied in autoclave to simulate the CO2 storage environment. The brine solution used in the study contained 130 g/l NaCl, 22.2 g/l CaCl2 and 4 g/l MgCl2. The CO2 was charged in the autoclave at different pressures (60, 80 and 100 bar) and at 45°C. The corrosion rate was measured using electrochemical and mass loss measurements. The surface of the samples after exposure to CO2 and brine was analyzed using SEM, EDS and XRD. The polarization results show that the corrosion rate of N80 steel in the brine plus CO2 is 6 mm/y in 1 hour and 0.3 mm/y after one week at 80 bar and 45C°. The corrosion of the steel at other pressures shows a
similar behaviour. The mass loss measurements show the average corrosion rate 0.06 mm/y after immersion for 32 days. The decrease of the corrosion rate for N80 steel in this environment is attributed to the formation of dolomite layer on the sample surface.
similar behaviour. The mass loss measurements show the average corrosion rate 0.06 mm/y after immersion for 32 days. The decrease of the corrosion rate for N80 steel in this environment is attributed to the formation of dolomite layer on the sample surface.
TNO Identifier
533570
ISSN
1876-6102
Source
Energy Procedia, pp. 3147-3159.
Publisher
Elsevier
Collation
7 p.
Place of publication
Amsterdam
Pages
3147-3159
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