High temperature oxidation behaviour of CeO₂ and La₂O₃ modified aluminide coatings on carbon steel

Abstract

The aluminide and CeO₂ and La₂O₃ containing aluminide coatings on carbon steel have been prepared by a pack cementation process. The influence of CeO₂ and La₂O₃ additions on the oxidation rates of aluminide coatings has been investigated. The performance of coatings was studied by measuring oxidation kinetics, metallography, SEM and X‐ray diffraction analysis techniques. The oxidation‐resistance of coated carbon steel is discussed on the basis of a decrease in oxidation rates as well as adherence of oxide scales. The oxidation rates of carbon steel and aluminide coatings were markedly reduced in the presence of CeO₂ and La₂O₃ in the temperature range of 700‐900°C. The oxidation rates were significantly affected by the morphology of oxide scales. In the case where the structure of oxides scales was not seriously disrupted due to decarburisation, the oxidation rates were significantly reduced.

Citation

Mobin, M., Sharma, H.K. and Hasan, S.K. (2002), "High temperature oxidation behaviour of CeO₂ and La₂O₃ modified aluminide coatings on carbon steel", Anti-Corrosion Methods and Materials, Vol. 49 No. 4, pp. 283-294. https://doi.org/10.1108/00035590210439757