Surface and Electrochemical Behavior of HSLA in Supercritical CO2-H2O Environment

Journal Article · Wed Jan 11 04:00:00 EST 2012 · ECS Transactions

DOI:https://doi.org/10.1149/1.3692436· OSTI ID:1043289

Ziomek-Moroz, M; Holcomb, G R; Tylczak, J; Beck, J; Fedkin, M; Lvov, S

General corrosion was observed on high strength low alloy carbon steel after electrochemical impedance spectroscopy experiments (EIS) performed in H{sub 2}O saturated with CO{sub 2} at 50 C and 15.2 MPa. However, general and localized were observed on the same material surfaces after the EIS experiments performed in supercritical CO{sub 2} containing approximately 6100 ppmv H{sub 2}O at 50 C and 15.2 MPa. The general corrosion areas were uniformly covered by the FeCO{sub 3}-like phase identified by X-ray diffraction (XRD). In the area of localized corrosion, XRD also revealed FeCO{sub 3}-rich islands embedded in {alpha}-iron. The energy dispersive X-ray (EDX) analysis revealed high concentrations of iron, carbon, and oxygen in the area affected by general corrosion and in the islands formed in the area of localized corrosion. The real and imaginary impedances were lower in H{sub 2}O saturated with CO{sub 2} than those in the supercritical CO{sub 2} containing the aqueous phase indicating faster corrosion kinetics in the former.

• Research Organization: National Energy Technology Laboratory - In-house Research
• Sponsoring Organization: USDOE Office of Fossil Energy (FE)
• OSTI ID: 1043289
• Report Number(s): NETL-PUB-240
• Journal Information: ECS Transactions, Journal Name: ECS Transactions Journal Issue: 24 Vol. 41; ISSN 1938-5862
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
CARBON
CARBON STEELS
CORROSION
IMPEDANCE
IRON
KINETICS
OXYGEN
SPECTROSCOPY
X-RAY DIFFRACTION