Corrosion behaviour of X65 carbon steel in supercritical-CO2 containing H2O and O2 in carbon capture and storage (CCS) technology. (April 2017)

• Record Type: Journal Article
• Authors: Tang, Y.; Guo, X.P.; Zhang, G.A.
• Is Part Of: Corrosion science. Volume 118(2017)
• Page Start: 118
• Page End: 128
• Publication Date: 2017-04
• Subjects: A. Carbon steel -- B. EIS -- B. SEM -- B. XPS; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2017.01.028
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Corrosion behavior of carbon steel in supercritical-CO2 (SC-CO2 ) phase was studied. A setup was developed for in situ electrochemical measurements in SC-CO2 phase. In the presence of small amount of O2, two-layer corrosion products were present. The presence of O2 leads to obvious increase of corrosion rate in SC-CO2 phase. Abstract: Corrosion behaviour of X65 carbon steel in supercritical-CO2 (SC-CO2 ) containing H2 O and O2 was studied by weight loss test, electrochemical measurements, and surface analysis. A setup was developed for in situ electrochemical measurements in H2 O-saturated SC-CO2 phase by using Ag/AgCl reference electrode. It is demonstrated that there is no essential difference in the electrochemical corrosion mechanism between SC-CO2 and non-SC-CO2 environments. The presence of small amount of O2 inhibits the formation of protective FeCO3 film and promotes the formation of non-protective Fe oxide, which leads to obvious increase of corrosion rate in SC-CO2 phase.