Abstract
The surface of NiCoCrAlYSiHf coating was modified by high-current pulsed electron beam (HCPEB), and the hot corrosion behavior of the coatings in different salts of Na2SO4/K2SO4, Na2SO4/NaCl, and Na2SO4/V2O5 at 900 °C was studied. Microstructural results show that after HCPEB irradiation, the surface of coating was remelted, and a polished, purified, compact, and refined remelted layer was formed; a large number of Y-enriched nanoparticles and high-density dislocation entanglement structures were uniformly distributed in the remelted layer. The results of the hot corrosion test show that the irradiated effects promoted the formation of a continuous and dense protective oxide film in different molten salt environments, effectively prevented the hot corrosion damage of the coating. This significantly reduces the corrosion weight gain, and reduced the corrosion rate by about one order of magnitude compared with the original ones. HCPEB technology significantly improves the hot corrosion resistance of NiCoCrAlYSiHf coating.
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