Synergic effects of temperature and pressure on the hydrogen diffusion and dissolution behaviour of X80 pipeline steel
Ruizhe Gao, Baihui Xing, Chao Yang, Xinyi Jiang, Juan Shang, Zhengli Hua
Abstract
Gas-phase hydrogen permeation experiments were conducted on X80 steel at temperatures from −15℃ to 60℃ and hydrogen pressures of 1, 4, 8 MPa. Hydrogen trap densities were determined, and a method for calculating nonlinear hydrogen concentration distribution was established and verified. Results reveal different temperature dependencies for hydrogen concentrations at varying pressures. At 4 and 8 MPa, the hydrogen concentration increases with temperature, whereas at 1 MPa, it initially decreases before increasing. Additionally, the influences of hydrogen pressure, hydrogen trap binding energy, and hydrogen trap density on this trend are discussed.
Topics & Concepts
DissolutionDiffusionCorrosionMaterials scienceMetallurgyPipeline (software)HydrogenChemistryChemical engineeringThermodynamicsEngineeringMechanical engineeringPhysicsOrganic chemistryHydrogen embrittlement and corrosion behaviors in metalsCorrosion Behavior and InhibitionMaterial Properties and Failure Mechanisms