Heat Treatment of Metals ›› 2020, Vol. 45 ›› Issue (7): 148-152.DOI: 10.13251/j.issn.0254-6051.2020.07.030

• MATERIALS RESEARCH • Previous Articles     Next Articles

Effect of La content on oxidation resistance of Fe-based corrosion resistant alloy

Li Dongsheng, Chai Dengpeng, Hou Guanghui, Li Zhiyuan, Liu Ying, Liu Dan   

  1. Zhengzhou Non-ferrous Metals Research Institute Co., Ltd., of CHALCO, Zhengzhou Henan 450041, China
  • Received:2020-01-20 Online:2020-07-25 Published:2020-09-07

Abstract: Oxidation resistance of Fe-base corrosion resistant alloys with different La content at 850 ℃ was studied by using XRD, SEM and EDS techniques. The results show that at 850 ℃, with the increase of La content, the anti-oxidation property of the alloy is reduced to a certain extent, but the adhesion of the oxide film to the matrix is greatly improved. The oxide film can be fixed on the alloy matrix tightly with the increase of La content by promoting the internal diffusion of oxygen and make the inner oxide layer become dendritic and go deep into the alloy matrix. The oxide film is mainly composed of three layers: the outer layer is the mixed layer of Fe2O3 and CuO, and contains a small amount of NiFe2O4; the middle layer is a protective layer dominated by NiFe2O4, and contains a small amount of Fe2O3 and NiO; the inner layer is an inner oxidation zone dominated by Fe2O3 and contains a small amount of NiO oxide.

Key words: rare earth La, Fe-based corrosion resistant alloy, high temperature oxidation, oxide film

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