Microstructure and Oxidation Resistance of Y_2O_3 Modified Aluminized Steel

The Y2O3-modified aluminized composite coating was prepared by electro-depositing Ni and Y2O3 particles on the surface of 20 steel at first,and then aluminizing on that composite using pack cementation method at 900 ℃ for 6 h.The microstructure of the aluminized layer was analyzed by SEM and the oxidation resistance of the coating was investigated through experiment also.The results show that the surface of Y2O3-modified aluminized coating is more homogeneous and denser than that of pure aluminized coating,and the microstructure of the modified coating becomes fine.Meanwhile,the high temperature oxidation resistance of the modified aluminized coating is improved markedly.Its oxidation incremental weight is only 2/5 of that of pure aluminized coating.