Galvanic corrosion between N80 carbon steel and 13Cr stainless steel under supercritical CO2 conditions. (February 2019)

• Record Type: Journal Article
• Authors: Li, Y.Y.; Wang, Z.Z.; Guo, X.P.; Zhang, G.A.
• Is Part Of: Corrosion science. Volume 147(2019)
• Page Start: 260
• Page End: 272
• Publication Date: 2019-02
• Subjects: A. Carbon steel -- A. Stainless steel -- B. EIS -- B. SEM -- C. Acid corrosion; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2018.11.025
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Galvanic corrosion behaviour in supercritical CO2 (SC-CO2 )-H2 O system was studied. Corrosion of N80 carbon steel was enhanced by coupled with 13Cr stainless steel. Galvanic effect under dynamic condition is bigger than that under static condition. Galvanic current decreases with time due to the formation of protective FeCO3 film. Abstract: The galvanic effect between N80 carbon steel and 13Cr stainless steel in formation water under supercritical CO2 conditions was studied by electrochemical measurements and surface characterization. It is demonstrated that the galvanic effect obviously promotes the corrosion of N80 carbon steel and lowers the protection of corrosion products under static and dynamic conditions. The fluid flow under dynamic conditions not only accelerates the corrosion of N80 carbon steel, but also strengthens the galvanic effect with higher galvanic current density. The galvanic current density decreases with increasing immersion time due to the decrease of potential difference and the increase of resistance.