Créé le : 06/02/2013
H. Buscail, C. Issartel, F. Riffard, R. Rolland, S. Perrier, A. Fleurentin, C. Josse - 01/12/2011 - Revue Applied surface sciences…
Abstract. Corrosion and carburization are the main reasons of conveyor units degradation due to a quick alloy weakening. In order to improve the alloys carburization resistance, an adherent oxide scale can act as a carbon diffusion barrier. The 330Cb alloy oxidation in air at 900°C was performed in order to grow a protective chromia scale. Nevertheless, after oxidation some scale spallation occurs during cooling. Then, argon-annealed lanthanum sol–gel coatings have been applied in order to improve the oxide scale adherence. This led to a thinner chromia scale. The convoluted scale structure suggested that a mixed diffusion process was induced by lanthanum. After carburization during 22 hours at 900 °C under Ar/10%CH4, the Cr2O3 scale was converted into carbides and it appears that is necessary to have a thick oxide scale to get a good protection.
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