Effect of an Enamel Coating on the Oxidation and Hot Corrosion Behavior of an HVOF-Sprayed Co–Ni–Cr–Al–Y Coating |
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Authors: | Xie D. Xiong X. Wang F. |
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Affiliation: | (1) State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Wencui Road 62, Shenyang, 110016, China |
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Abstract: | The oxidation and hot-corrosion behavior of a Co–Ni–Cr–Al–Y coating produced by high-velocity oxygen fuel (HVOF) with and without an enamel coating were investigated in air at 900°C and in molten 75 wt.% NaCl+25 wt.% Na2SO4 at 850°C. The results show that the enamel coating possesses excellent hot corrosion resistance in the molten salt, in comparison with the HVOF-sprayed Co–Ni–Cr–Al–Y coating alone. In the hot-corrosion test, breakaway corrosion did not occur on the samples with the enamel coating and the composition of the enamel did not significantly change. The oxidation resistance of the Co–Ni–Cr–Al–Y coating, which had good adhesion, was also improved by the enamel coating. |
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Keywords: | enamel coating HVOF coating hot corrosion isothermal oxidation |
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