Experimental comparison of gaseous and electrochemical hydrogen charging in X65 pipeline steel using the permeation technique. (1st May 2023)

• Record Type: Journal Article
• Authors: Koren, Erik; M. H. Hagen, Catalina; Wang, Dong; Lu, Xu; Johnsen, Roy; Yamabe, Junichiro
• Is Part Of: Corrosion science. Volume 215(2023)
• Publication Date: 2023-05-01
• Subjects: A. Low alloy steel -- B. Hydrogen permeation -- B. Galvanostatic -- C. Hydrogen embrittlement -- C. Hydrogen absorption; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2023.111025
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: Herein, hydrogen uptake and diffusivity in X65 pipeline steel were investigated using the permeation technique under different hydrogen charging conditions. Hydrogen charging was performed using hydrogen gas at different pressures, and electrochemical charging was performed at different cathodic current densities. The results revealed that both the sub-surface hydrogen concentration in lattice and reversible trap sites and the effective hydrogen diffusivity were dependent on the charging conditions. Moreover, the relationship between equivalent hydrogen fugacity and overpotential was determined. Highlights: Hydrogen permeation was performed with gaseous and electrochemical charging. The equivalent hydrogen fugacity was determined as a function of overpotential. The effective hydrogen diffusivity was dependent on the charging condition. Partial permeation transients reduced trapping effects on permeation transients.