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| Hot Corrosion Behavior of Typical Bond Coats in Thermal Barrier Coatings Systems |
| YANG Yingfei 1,2, REN Pan 1,2, BAO Zebin 2 , DENG Chunming 3,4, LI Wei1 |
| (1. Institute of Advanced Wear & Corrosion Resistant and Functional Material, Jinan University, Guangzhou 510632, China; 2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; 3. National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou 510650, China; 4. The Key Lab of Guangdong for Modern Surface Engineering Technology, Guangzhou 510650, China) |
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Abstract In order to investigate the hot corrosion behavior of the commonly-used bond coats for thermal barrier coating system, four typical bond coats (i.e., plain NiAl coating, NiCoCrAlY coating, Pt modified NiAl coating and Pt+Hf co-modified NiAl coating) were comparably evaluated in the mixed salts of Na2SO4/NaCl (mass fraction 75%∶25%) at 900℃. The phase constitution evolution and microstructure change during hot corrosion were analyzed by scanning electron microscope (SEM), electron probe micro-analyzer (EPMA) and X–ray diffractometer (XRD). The results showed that plain NiAl coating degrades fastest during hot corrosion test. In contrast, the degradation rate of NiCoCrAlY coating is slower. The hot corrosion resistance of the two modified NiAl coatings is satisfactory, Pt modified NiAl is the best among the four coatings. It seems that the addition of Hf does not benefit the hot corrosion resistance of Pt–Al coating.
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2020, 
