A trapping theory of hydrogen in pure iron

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Abstract
A model of hydrogen trapping and retrapping in hydrogen-charged iron is suggested and support for it provided by the thermal analysis technique. The theory, which can pre-estimate and describe the behaviour of supersaturated hydrogen in interstitial sites of a normal lattice, considers the variation of the equilibrium state between the hydrogen in trapping sites and in normal lattice sites with change in temperature, which occurs during rapid cooling after hydrogen charging at high temperatures. The theoretical and experimental results suggest that a datum point, classifying the trap as reversible or irreversible, is 26·4 kJ mol−1, which is the trap activation energy for hydrogen release from a dislocation. A trap with a lower trap activation energy than that for the dislocation, such as a grain boundary, is a reversible trap for hydrogen and that with a higher energy, such as a microvoid, an interface of an Al2O3 particle, etc., in iron, is an irreversible trap.

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