Effects of diffusion time on the depth of diffusion layers in hot dip pure aluminized steel and aluminized steel with RE have been examined

meanwhile

the RE distribution in the diffusion layers has been probed by SEM（scanning electronic microscope） and EPMA（electron probe micro-analyzer）.The depth of diffusion layer in the samples with different diffusion time at 850 ℃ was measured

which shows approximately square parabola law between depth of diffusion layer and diffusion time.The experimental results reveal that the RE can penetrate into the diffusion layer and increase the penetrated rate by 25%

3

0% as well as decreasing diffusion active energy by 7857.39 J/mol.