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.
|Journal||Journal of Chinese Society for Corrosion and Protection|
|Publication status||Published - 2014|
- Hot Corrosion