在20钢上分别制备了热浸镀纯铝和稀土铝层。通过不同温度的扩散处理后,测定了扩散层的稀土分布和扩散层厚度增量,考察了在不同温度下稀土对扩散层生长动力学的影响,并通过计算机拟合给出了扩散层生长动力学曲线。结果表明,热浸镀稀土铝钢在扩散处理时,稀土渗入了扩散层,且存在偏聚;稀土可增加扩散层厚度,在750、850℃作用较明显;扩散系数增加1.8~2.3倍,扩散激活能降低4500~7800 J.mol-1。 Hot dip aluminum and rare earth aluminum layers were prepared on 20 steel. After diffusion treatment at different temperatures, the distribution of rare earth elements and the thickness of diffusion layer were measured. The effects of rare earth on the growth kinetics of diffusion layer were investigated at different temperatures. The growth momentum of diffusion layer was given by computer simulation Learn the curve. The results show that rare earth infiltrated into the diffusion layer and segregated in the hot-dip aluminized steel during the diffusion treatment. The thickness of the diffusion layer can be increased by rare earths, and the effect is obvious at 750 and 850 ℃. The diffusion coefficient increases by 1.8-2.3 times, Activation can reduce 4500 ~ 7800 J.mol-1.