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Hot corrosion studies of a salt‐coated Ni‐based superalloy under flowing wet air and sulfur vapor ambient
Author(s) -
Liu Hongfei,
Chen Shuting,
Tan Dennis C. C.,
Lee Coryl J. J.,
Yao Kui
Publication year - 2020
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.202011667
Subject(s) - corrosion , superalloy , materials science , sulfur , spallation , non blocking i/o , metallurgy , layer (electronics) , high temperature corrosion , oxygen , salt (chemistry) , composite material , alloy , chemistry , catalysis , organic chemistry , biochemistry , physics , quantum mechanics , neutron
Corrosion of a salt‐coated Ni‐superalloy has been studied at 900°C under a wet air and sulfur vapor ambient. The corrosion thickness, after an incubation of ~60 hr, linearly increases with the corrosion time t and the onset of surface spallation occurred at t ≈ 60 hr. The corroded layer consists of a corrosion front dominated by Cr 3 S 4 scales and linear precipitate structures, an inner corrosion layer dominated by Ni 3 S 2 and NiO, and an outer corrosion layer dominated by Al 2 O 3 networks surrounding the Ni 3 S 2 and/or NiO scale structures. The corrosion mechanism is discussed based on the coexistence of H 2 O, sulfur, and oxygen.