Abstract
The Cr-Si-Zr (or Y) modified aluminide coatings were produced on Ni-base INC738 by a novel single step pack cementation process and their behavior was evaluated in cyclic oxidation and hot corrosion conditions. A dual layer pack with different composition was applied to produce Cr-Si-Zr or Cr-Si-Y modified aluminide coatings. A mixture of salts 75%Na2SO4-20%NaCl-5%V2O5 at 950°C was used as a hot corrosion environment. The results show that oxidation and corrosion rate of Cr-Si-Zr or Cr-Si-Y modified aluminide coatings produced by dual layer pack process are lower than those of uncoated or simple aluminide coatings. Coatings with higher Al content and uniformly dispersed Cr-Si rich phases show better hot corrosion resistance.
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