Abstract
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%Na 2SO 4 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 Al 2O 3 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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