Abstract
NiCoCrAlYSiHf coating was prepared for the surface of the 3039 Ni-based superalloy. The coating was prepared via arc ion plating, and it was modified using a high-current pulsed electron beam (HCPEB) technique. The effects that HCPEB irradiation had on the hot corrosion properties of the NiCoCrAlYSiHf bonding layer at 900 °C with mixed salt (75 wt% Na2SO4 + 25 wt% K2SO4) were studied. The results showed that after HCPEB irradiation, the defects on the surface of the original coating disappeared, and then the surface remelted. Y-enriched Al2O3 particles formed on the surface after 30 irradiation treatments. The results of the hot corrosion test showed that the original coating had poor hot corrosion resistance and severe spalling of corrosion products and that internal oxidation occurred. A continuous and dense Al2O3 film was expected in the molten salt of the irradiated coating, and this effectively blocked further corrosion of the coating. The results showed that HCPEB irradiation promoted rapid formation of a protective oxide film on the surface of the coating and significantly improved the hot corrosion resistance of the NiCoCrAlYSiHf coating.
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