Abstract
Dy-Co-modified aluminide coating was deposited onto Ni-based superalloy DZ125 using pack cementation method. The microstructure and hot corrosion behavior of the coating were investigated. The results show that as-deposited coating has a two-layer structure. The outer layer of the coating is composed mainly of Al0.9Ni1.1 with dispersed Dy2Hf2O7. The mass gain of the coating is 0.23mg/cm2 after exposure to 75wt.% Na2SO4+25wt.% NaCl at 900°C for 100h. The corrosion product formed on the coating is characterized as Al2O3. Role of Dy in the improvement of the hot corrosion resistance has been discussed.
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