期刊
CORROSION
卷 71, 期 8, 页码 992-1002出版社
NATL ASSOC CORROSION ENG
DOI: 10.5006/1677
关键词
corrosion resistance; microscopy; microstructure; oxide; supercritical environment; transmission electron
资金
- Natural Resources Canada through Office of Energy Research and Development
- Atomic Energy of Canada Limited
- Natural Sciences and Engineering Research Council of Canada
- NSERC
- Canada Foundation for Innovation
- McMaster University
The purpose of this study was to examine the structure and composition of the oxide scales formed on Alloy 800HT in a supercritical environment after a relatively short exposure time (circa 500 h) to provide a more complete physical description of the metallurgical factors that influence the protectiveness of the scale formed. This was achieved using transmission electron microscopy and associated techniques on site-specific cross-section samples prepared by focused ion beam milling. No physical evidence in support of oxide scale exfoliation was found. Rather, the formation of the discontinuous magnetite (Fe3O4) outer nodular layer is believed to be controlled to a large extent by the underlying microstructure and the presence of epsilon-martensite plates in particular. The formation of a thin compact corundum-type ([ Cr, Fe](2)O-3) base scale is considered to be sufficiently encouraging to justify an effort to reduce or eliminate the small volume fraction of epsilon-martensite from the starting microstructure of Alloy 800HT as a means to optimize the corrosion resistance.
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