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.
This paper investigated the influence of Cr 3 C 2 -Ni-Cr coating on high temperature oxidation behaviour of 2?25Cr-1Mo steel. The coating of Cr 3 C 2 -NiCr was made by plasma spray coating method. The isothermal corrosion test was carried in air oxidation environment at 973 K for 72 h and the weight change of the specimen during corrosion study was measured at different interval. The corrosion rate and reaction kinetics were studied and the post corroded scales were characterised in SEM, EDS and XRD. The results clearly indicated that Cr 3 C 2 -NiCr coated specimen significantly improved the corrosion resistance. The improvement of oxidation resistance in presence of coating could be attributed to the formation of protective Cr 2 O 3 layer and changed mechanism of scale growth from outer cation migration to inner anion migration. The detail mechanism of the oxidation behaviour in presence of Cr 3 C 2 -NiCr coated and uncoated specimen was discussed in this paper.
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