Dissociative Adsorption, Absorption and Permeation of Hydrogen on Steel Pipelines
Date
2021-07-13
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Hydrogen is a green, clean fuel. Development of hydrogen energy is critical to achieving the net-zero emission target. Pipelines provide a promising alternative for hydrogen transportation. However, hydrogen embrittlement becomes a major concern to the safety of the pipelines. This research investigates entrance and permeation of hydrogen by modelling and experimental methods. Dissociative adsorption on Fe (100) could happen in wide temperature/pressure ranges, but spontaneous dissociation could be neglected as an effective H-atoms source. Fe-H bonds are formed by hybridization via charge accumulation on H atoms and weakened by coverage and stress. Corrosion enhancement following mechano-electrochemical (M-E) interaction is found at heat affected zone (HAZ) of X80 weld, where substantial hydrogen trapping sites are included. Elastic stress elevates hydrogen entrance and diffusion while plastic stress slows down diffusion but further increase hydrogen uptake. Stress concentration near weldment and interactions between hydrogen permeation and stress would lift degradation susceptibility at HAZ.
Description
Keywords
Density functional theory, Finite element method, Hydrogen pipeline
Citation
Sun, Y. (2021). Dissociative Adsorption, Absorption and Permeation of Hydrogen on Steel Pipelines (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca.