Hydrogen and Materials: Embrittlement, Permeation and Control
Explain how hydrogen enters materials, moves through them and changes fracture behaviour.
Hydrogen uptake
Hydrogen can enter during production, corrosion, electrochemical charging or high-pressure service.
Transport and trapping
Atomic hydrogen diffuses through the lattice and interacts with dislocations, interfaces, precipitates and vacancies.
Embrittlement mechanisms
Hydrogen can promote localised plasticity, reduce cohesive strength or stabilise damage processes depending on alloy and stress state.
Mitigation
Material selection, microstructure control, coatings, stress reduction and environmental limits reduce risk but rarely eliminate it universally.
Engineering takeaway
Qualification must reproduce pressure, temperature, strain rate, surface condition and exposure history relevant to service.