Corrosion behavior of low alloy steel used for new pipeline exposed to H2S-saturated solution. (8th September 2022)

• Record Type: Journal Article
• Authors: Liu, Zhenguang; Wang, Yiming; Zhai, Yangdong; Qiao, Yanxin; Zheng, Chuanbo; Wang, Dongpeng; Shi, Xingling; Lu, Huihu; Liu, Chuan
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 77(2022)
• Page Start: 33000
• Page End: 33013
• Publication Date: 2022-09-08
• Subjects: Corrosion -- Low alloy steel -- Flexible riser -- H2S; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.07.203
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: In this paper, the corrosion behavior of low alloy steel in H2 S-saturated solution is systematically studied through immersion experiment in terms of microstructure morphology, corrosion kinetics, surface morphology, cross-sectional morphology, crystal characteristic and elemental distribution. The experimental results suggest that the corrosion rate decreased gradually with corrosion time. The corrosion products were immediately formed after the steel was immersed in corrosion solution and the structure and thickness became denser and thicker, which improved corrosion resistance. The corrosion products transformed from mackinawite, greigite and molybdenite to mackinawite, greigite, pyrrhotite and molybdenite. For the alloying elements, Cr and Mo tended to be accumulated in corrosion products compared with the steel substrate. A schematic model of corrosion process was proposed according to experimental results. Graphical abstract: Image 1 Highlights: The evolution process of iron sulfides on steel surface is systematically analyzed. The style and surface morphology of iron sulfides changes with prolonging time. A model of corrosion process of low alloy steel exposed to H2 S solution is proposed.