Hot Corrosion of Porous NiCr Alloy With NaCl Deposit at 750°C
CHEN Lingyun1,2, LAN Hao2, HUANG Chuanbing2, YANG Bin1,3, FANG Shige2, ZHANG Weigang2
( 1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing,Beijing 100083, China;
2. State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering,Chinese Academy of Sciences, Beijing 100190, China;
3. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing,Beijing 100083, China)
Abstract：In order to elucidate NaCl-induced hot corrosion of NiCr-based abradable coatings in high-pressure compressor,
the porous 80Ni20Cr alloy was prepared by powder metallurgic process. The hot corrosion of porous NiCr alloy
with NaCl deposit at 750°C was investigated by SEM, EDS and XRD. Results show that NaCl accelerates the oxidation of
NiCr alloy by preventing the formation of continuous and compact Cr2O3. And cracks can be observed in the oxide scale
which consists of Cr2O3, NiO and NiCr2O4. Furthermore, the corrosion mechanism is also discussed by TG-DSC and thermodynamics
calculations. Cr could react with NaCl, accelerating the corrosion of NiCr porous alloy by chlorination and
oxidation.
2017, 
