Hot Corrosion Behavior of Four Modified Aluminide Coatings on DZ38G Alloy

Duoli Wu, Hongyu Zhang, Hua Wei, Qi Zheng, Tao Jin, Xiaofeng Sun

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Four modified aluminide coatings were prepared on superalloy DZ38G, which include a two step co-cementation coating NiCr-CrAl and three one step co-cementation coatings Co-Al, AlSi and Al-Ti. Then their microstructure and hot corrosion behavior in a salt melt of 25%NaCl (mass fraction)+75%Na2SO4 (mass fraction) at 900 ℃ were investigated. The results show that a continuously compact scale of corrosion products with good adhesion to the matrix could form on Ti-Al coating during corrosion, therefore, the Al- Ti coating may provide much better protectiveness to the alloy rather than the other three coatings in this kind of salt mixture.
Original languageChinese
JournalJournal of Chinese Society for Corrosion and Protection
Issue number6
Pages (from-to)502-506
Publication statusPublished - 2014
Externally publishedYes


  • Superalloy
  • Coating
  • Hot Corrosion

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