The Influence of Rare-earth Elements During the Process of Hydrogen Permeation in Pure iron

The effect of rare earth elements Nd and La on hydrogen permeation in pure iron was studied by means of a Davanathan apparatus Experimental results indicate the diffusion coefficient reduces as the amount of solute Nd or La increases. It's concluded that Nd or La is a reversible Shallow trap of hydrogen pemeation in iron The binding energy of hydrogen around solure Nd is 4.4 kcal/mol and the diffusion activation energy of hydrogen is 6.1 kcal/mol.