The effect of Cr, Mn, Co, Ni, Si and Mo on diffusivity of hydrogen in α-Fe is studied near room temperature. The diffusivity of hydrogen was determined by the electrochemical method. The results show that the diffusivity of hydrogen in binary iron alloys decreases, and the activation energy increases, as the concentration of alloying elements increases. The trapping parameters of the alloying elements in the iron alloys on the basis of Oriani's approach are calculated and the trap binding energy between the above elements and hydrogen are obtained. The order of increasing trap binding energy is as follow: Si, Co, Ni, Mn, Cr, Mo. Finally, the nature of the trap binding energy is analyzed according to both electronic interaction effects and elastic strain effects of allowing elements on hydrogen trapping.
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