Add time:07/30/2019         Source:sciencedirect.com

The beneficial effect of yttrium on the oxidation and hot corrosion resistance of electron beam-physical vapour deposition and low pressure plasma spraying overlay coatings has been confirmed by many studies. However, these coating processes have two disadvantages: (1) a restriction on the application of the coatings to complex geometries and (2) high equipment investment. In this study, a very simple slurry process was used to introduce yttrium into an aluminide coating. Its hot corrosion was tested in 25%NaCl + 75%Na2SO4 at 1123 K and the result showed that the hot corrosion resistance of the aluminide coating is greatly improved by the addition of yttrium. The internal oxidation and sulphidation of yttrium-free coating is more severe than that of the coating containing yttrium. It is observed that yttrium is enriched in the outer Al2O3 layer which is very adherent to the coating. However, oxide spalling occurred on the surface of the yttrium-free aluminide coating.

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