Hot corrosion behavior of NiCr-Cr3C2-CaF2/BaF2 composite coating with NiAl bond coating in molten NaCl-KCl and NaCl-Na2SO4 at 800 ℃
Source abstract
Abstract
The NiCr-Cr 3C 2-CaF 2/BaF 2 coating with the NiAl bond coating was sprayed on a Ni16Cr13Co4Mo(wt%) alloy by detonation-gun spray, and hot corrosion behaviors were studied by electrochemical measurements. In molten NaCl-KCl, the corrosion products were mainly Cr 2O 3. Gas phases such as Cl 2 led to spallations and cracks on the coating surface. In molten NaCl-Na 2SO 4, Na 2SO 4 decomposed and reacted with the coating. Mixed oxides formed a continuous corrosion layer, and Al diffused outward from bond coating to be oxidized. Some liquid phases existed in the corrosion layer and promoted hot corrosion. The detailed hot corrosion mechanisms in two molten salts were discussed.
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Research context
OpenAlex topics: High-Temperature Coating Behaviors · Intermetallics and Advanced Alloy Properties · Advanced materials and composites
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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