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本文用电化学方法研究了稀土元素Nd和La对工业纯铁中氢的渗透过程和扩散系数的影响。实验结果表明,随着铁中Nd或La含量的增加,氢的渗透过程减慢、扩散系数下降。固溶Nd和La原子是铁中氢的可逆浅陷井。固溶Nd原子与氢的结合能为4.4kcal/mol。当钕含量在0.082wt.％以下时,氢在铁中的扩散过程激活能为6.1kcal/mol。实验还测定了含Nd铁中氢的渗透过程激活能为8.7kcal/mol。
In this paper, the effects of rare earth elements Nd and La on hydrogen permeation and diffusion coefficient in industrial pure iron have been studied electrochemically. The experimental results show that with the increase of Nd or La content in the iron, the hydrogen permeation process slows down and the diffusion coefficient decreases. Solid solution Nd and La atoms are reversible shallow traps of hydrogen in iron. The binding energy of solid solution Nd atoms to hydrogen is 4.4 kcal / mol. When the neodymium content is below 0.082 wt.%, The activation energy of hydrogen diffusion in iron is 6.1 kcal / mol. The experiment also determined that the activation energy of hydrogen permeation in Nd-containing iron is 8.7 kcal / mol.