Journal
CORROSION SCIENCE
Volume 73, Issue -, Pages 72-79Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2013.03.026
Keywords
Cobalt; SEM; XPS; Interfaces; Oxide coatings
Funding
- Ministry of Education, Culture, Sports, Science, and Technology of Japan
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Oxide films formed at 700 degrees C on Co-29Cr-6Mo alloy were characterised extensively to improve the corrosion resistance of the alloy to liquid Al, enabling its use in Al die-casting moulds. Film of duplex layer consisting of an outer CoO-rich layer and an inner Cr2O3-rich layer was observed in samples subjected to oxidation for 4 h. With an increase in duration of oxidation, CoO was gradually replaced by Cr2O3, resulting in a single-layered oxide film dominantly composed of Cr2O3. The oxide film evolved with duration of oxidation treatment indicating the possibility of optimising films for Al die-casting moulds. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.
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