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Hot Corrosion Behavior of Four Modified Aluminide Coatings on DZ38G Alloy |
WU Duoli, ZHANG Hongyu, WEI Hua(), ZHENG Qi, JIN Tao, SUN Xiaofeng |
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China |
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Abstract 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, Al-Si 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.
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