Nanostructured CeO 2 coating for high temperature oxidation protection

Abstract

This paper investigates the influence of nanostructured ceria (CeO₂) coating on high temperature oxidation behaviour of 2·25 Cr-1 Mo steel. The isothermal corrosion study of the micrometre size and nanostructured CeO₂ coated specimens was conducted in air oxidation environment at 973 K for 8 h. The corrosion rate and reaction kinetics were studied, and the post-corroded scales were characterised by field emission scanning electron microscopy and X-ray diffraction. The results clearly indicate that the nanostructured CeO₂ coated specimen improves the oxidation resistance in comparison to the micrometre size CeO₂ coated specimen. The improvement of oxidation resistance in the case of nanostructured CeO₂ coating can be attributed to the formation of semimolten zone, which consists of nanostructured CeO₂ particle. On the other hand, in the absence of semimolten nanostructured zone, the micrometre size CeO₂ coated specimen shows higher corrosion rate in comparison to the nanostructured CeO₂ powder coated specimen.

Keywords

Cr–Mo steel Nanostructure Coating Oxidation

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