Abstract
A two-layer film composed of a reactive element (RE) oxide (ZrO2, Y2O3, CeO2, or La2O3) and aluminum oxide (Al2O3) was prepared on the surface of Fe-18Cr alloys by an electrochemical process combined with sintering. High-resolution field emission scanning electron microscopy (FE-SEM) was used to characterize the two-layer film, which showed nanostructure. SEM, EDS and mass gain measurement were used to study the oxidation resistance of the film on Fe-18Cr alloy. It is proved that this kind of film is effective in protecting the substrate from oxidation. The results also indicated that the two-layer film possesses superior oxidation resistance than a single Al2O3 film. The mechanisms accounting for such effects have been discussed.
The work is supported by National Natural Science Foundation of China (Grant No.50271010) and the Doctorial Foundation of University of Jinan (B0606).