Effect of Surface Decarburization on Corrosion Behavior of GH3535 Alloy in Molten Fluoride Salts

Corrosion test of a Ni–16Mo–7Cr alloy with a decarburized layer was conducted in FLiNaK salt at 700 °C. A detailed microstructure study was performed to investigate the corrosion behavior and mechanisms. The results show that the Fe-rich layers were formed on the corroded alloys with and without dec...

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Bibliographic Details
Published in:Acta metallurgica sinica : English letters 2019-03, Vol.32 (3), p.401-412
Main Authors: Hou, Juan, Han, Fen-Fen, Ye, Xiang-Xi, Leng, Bin, Liu, Min, Lu, Yan-Ling, Zhou, Xing-Tai
Format: Article
Language:English
Subjects:
Alloys
Characterization and Evaluation of Materials
Chemistry and Materials Science
Concentration gradient
Corrosion and Coatings
Corrosion effects
Corrosion resistance
Corrosion tests
Decarburization
Decarburizing
Fluorides
Grain size
Graphite
High temperature
Iron
Materials Science
Metallic Materials
Microscopy
Microstructure
Nanotechnology
Nickel base alloys
Nuclear reactors
Organometallic Chemistry
Oxidation
Spectroscopy/Spectrometry
Spectrum analysis
Superalloys
Tribology
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Summary:Corrosion test of a Ni–16Mo–7Cr alloy with a decarburized layer was conducted in FLiNaK salt at 700 °C. A detailed microstructure study was performed to investigate the corrosion behavior and mechanisms. The results show that the Fe-rich layers were formed on the corroded alloys with and without decarburization. The surface decarburization had little influence on the corrosion resistance of the alloy, whereas it caused more M 2 C carbide formation beneath the corrosion layer. That is attributed to the higher concentration of C gradient near the alloy surface, which was resulted from the increase in C content liberated from graphite crucible wall during the corrosion process.
ISSN:1006-7191
2194-1289
DOI:10.1007/s40195-018-0814-5