Hydrogen Uptake in Steels Exposed to High-Pressure H₂ Gas

Experimental data on hydrogen uptake in steels exposed to high-pressure H₂ gas is limited and its uptake mechanism has not been well understood. The present study has examined the effects of H₂ gas pressure, elevated temperature and steel type on hydrogen entry into steels using a combination of a conventional autoclave and thermal desorption analysis, and also a newly developed high-pressure H₂ gas permeation testing apparatus. The obtained experimental data reveals that hydrogen uptake in steels is sensitive to the surface condition and the role of Pd plating and the native air-formed oxide film in hydrogen entry into steels will be discussed.