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This paper investigates the effect of cerium oxide (CeO 2 ) coating on the high temperature corrosion behaviour of normalised and tempered 2?25Cr-1Mo steel in oxidation-sulphidation (SO 2 zO 2 ) mixed gas environment. The CeO 2 coating of two different coating thicknesses (150 and 300 mm) is prepared for experimental investigations. The isothermal corrosion study of uncoated and different CeO 2 coated specimens is carried out in SO 2 zO 2 environment at 973 K. The external scales of the post-corroded specimens are characterised after corrosion test by scanning electron microscopy and X-ray diffraction. CeO 2 coated specimens show higher corrosion resistance than uncoated specimen. The higher corrosion resistance of CeO 2 coated specimens is associated with excellent scale plasticity and adhesion. The detailed mechanism of the corrosion is discussed in the paper.

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