2-modified aluminide coating was prepared on 309 stainless steel by pack cementation method with NH4Cl as activator. The surface and cross-section of the coating before and after cyclic-oxidation at 900 °C for 50 cycles were analyzed by X-ray diffractometer and scanning electron microscope coupled with energy dispersive spectroscope. The microstructure analysis results show that the modified coating consists of Fe4Al13 phase. A few CeO2 nanoparticles are entrapped due to the outward diffusion of base metal. Compared with the normal aluminide coating without the addition of CeO2 nanoparticles, the aluminide coating modified by dispersed CeO2 nanoparticles has better scale spallation resistance in air at 900 °C. Some Fe2Al5 phases can be found on CeO2-modified aluminide coating even after 50 cycles of oxidation. Additionally, the outward-diffused Al layer, the intermediate FeAl layer, and the external Fe2Al5+FeAl mixed layer exist in the coating, suggesting that CeO2 nanoparticles can retard the degradation of aluminide coatings."/>
Naval Architecture & Port Engineering College, Shandong Jiaotong University, Weihai 264200, China
Natural Science Foundation of Shandong Province (ZR2019MEE107); Project of Shandong Provincial Department of Transportation (2020B88); Graduate Science and Technology Innovation Project of Shandong Jiaotong University (2023YK106, 2023YK109)
[Li Qindong, Meng Junsheng, Chen Baisen, Hao Chenfan, Chen Zhihui. Cyclic-Oxidation Behavior of CeO2-Modified Aluminide Coating on 309 Stainless Steel[J]. Rare Metal Materials and Engineering,2023,52(11):3707~3714.]
DOI:10.12442/j. issn.1002-185X.20230205