Journal
CORROSION SCIENCE
Volume 98, Issue -, Pages 406-416Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2015.05.051
Keywords
Alloy; Intermetallics; Weight loss; Kinetic parameters; Oxidation
Funding
- Office of Naval Research (ONR) [N00014-10-1-0913]
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Multiphase Mo-Si-B alloys comprised of Mo(ss), Mo3Si (A15), and Mo5SiB2 (T-2) phases offer attractive high-temperature mechanical properties with some capability to resist oxidation via production of a borosilica surface layer. In previous work, Fe additions into Mo-rich Mo-Si-B alloys appreciably limited transient oxidation, where the major mass change occurs, by enhancing the fluidity of borosilica. In the current study, the mechanism for borosilica modification is attributed to non-bridging oxygen (NBO) production and retention by Fe addition. An oxidation kinetics model is developed for Mo-Si-B alloys with Fe additions that can be extended to other oxidation-resistant refractory metal systems. (C) 2015 Elsevier Ltd. All rights reserved.
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