Formation of Decarbonization Layer and its Effect on Corrosion Resistance of Zirconia Graphite Materials

Abstract:

The effect of graphite content on formation of decarbonization layer and corrosion resistance of zirconia graphite materials were studied by the corrosion test in induction furnace, and the effect of decarbonization layer on corrosion of zirconia graphite materials was also analysed by the kinetic models for the corrosion of SEN in mold, the result show that: (1) Thickness of decarbonization layer of slag line is decreasing with the increase of graphite content. When the mold fluxes for high carbon steel is used, decarbonization layer is thin and graphite content has little effect on corrosion resistance of zirconia graphite materials, and 10wt%graphite is better. When the mold fluxes for low carbon steel is used, decarbonization layer is thick and 14wt% graphite is the best. (2) Corrosion of zirconia graphite materials in mold is characterized by the features of consecutive reaction:original layer (k₁) decarbonization layer (k₂) corrosion layer . If k₁<2, there is no decarbonization layer forming and decarbonization is the key step for the corrosion; If k₁>>k₂, there is decarbonization layer on the hot surface of zirconia graphite materials and the corrosion of the layer is the key step. Graphite content is too high or too low is all harmful for the corrosion resistance of zirconia graphite materials.

• Periodical: Advanced Materials Research (Volumes 399-401)
• Pages: 336-342
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.399-401.336
• Online since: November 2011
• Authors: Fan Qian, Hong Xia Li, Guo Qi Liu
• Keywords: Corrosion Resistance, Decarbonization Layer, Zirconia Graphite Materials

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