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High temperature oxidation of HP40 alloy under H 2 –H 2 O and air atmospheres: a surface study
Author(s) -
Bao Binbin,
Liu Jinglei,
Zhang Kai,
Xu Hong
Publication year - 2017
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.6235
Subject(s) - alloy , x ray photoelectron spectroscopy , oxide , spallation , high temperature corrosion , valence (chemistry) , metallurgy , materials science , chemistry , crystallography , analytical chemistry (journal) , chemical engineering , environmental chemistry , physics , organic chemistry , quantum mechanics , neutron , engineering
In the present work, high temperature oxidation of HP40 alloy was carried out at 1050 °C under H 2 –H 2 O and air atmospheres; the influence of atmosphere on surface morphology and composition was studied. Octahedral crystals with considerable spalled regions are present on the surface of alloy oxidized under air, the oxide scale composes of MnCr 2 O 4 , Cr 2 O 3 and (Fe, Ni)Cr 2 O 4 and spalled regions exhibit base alloy and SiO 2 ‐rich regions. The surface of alloy oxidized under H 2 –H 2 O is fully covered by small granular crystals and blade‐type structures without spallation, and the oxide scale composes of MnCr 2 O 4 and Cr 2 O 3 . Moreover, X‐ray photoelectron spectroscopy analysis shows considerable difference in chemical valence states of Mn, Cr and O elements on both alloy surfaces, and hydroxyl compounds exist on the alloy oxidized under H 2 –H 2 O atmosphere. Copyright © 2017 John Wiley & Sons, Ltd.