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The High temperature oxidation of iron‐chromium alloys containing 0.1 wt. % cerium or cerium oxide
Author(s) -
RhysJones T. N.,
Grabke H. J.,
Kudielka H.
Publication year - 1987
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.19870380203
Subject(s) - cerium , cerium oxide , oxide , alloy , chromium , materials science , metal , metallurgy , bar (unit) , inorganic chemistry , chemistry , physics , meteorology
The effects of 0.1 wt% Ce in both metal and oxide form on the high temperature oxidation of Fe‐Cr (Cr = 10, 12, 14, 16, 18, 20) have been investigated at 1000°C in a 0.1315 bar O 2 /He mixture at a total pressure of 1 bar. The presence of Ce and CeO 2 markedly affects the oxidation characteristics of the tested alloys, causing rapid initial coverage with protective oxide, decreased overall rates of oxidation, modifications in scale morphologies and enhanced scale adhesion. There is a possibility of a “trade‐off” between the amount of Cr in the Fe‐Cr materials and the presence of Ce of CeO 2 , since such additions have been shown to decrease the amount of Cr necessary to form a protective Cr 2 O 3 scale on the alloy surface. The mechanisms by which the Ce or CeO 2 improve the oxidation behaviour of Fe‐Cr alloys are discussed.