In-situ surface transformation of magnesium to protect against oxidation at elevated temperatures

[Display omitted] The native oxide thin scale on magnesium (Mg) surface appears continuous and crack-free, but cannot protect the Mg matrix from further oxidation, especially at elevated temperatures. This thermal oxidation process is witnessed in its entirety using a home-made in-situ heating devic...

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Bibliographic Details
Published in:Journal of materials science & technology 2020-05, Vol.44 (C), p.48-53
Main Authors: Wang, Yuecun, Li, Meng, Yang, Yueqing, Zhao, Xin’ai, Ma, Evan, Shan, Zhiwei
Format: Article
Language:English
Subjects:
Carbonation
In-situ E-TEM
Magnesium
Materials Science
Metallurgy & Metallurgical Engineering
Oxidation inhibition
Thermal oxidation
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Summary:[Display omitted] The native oxide thin scale on magnesium (Mg) surface appears continuous and crack-free, but cannot protect the Mg matrix from further oxidation, especially at elevated temperatures. This thermal oxidation process is witnessed in its entirety using a home-made in-situ heating device inside an environmental electron transmission microscope. We proposed, and verified with real-time experimental evidence, that transforming the native oxide scale into a thin continuous surface layer with high vacancy formation energy (low vacancy concentration), for example MgCO3, can effectively protect Mg from high-temperature oxidation and raise the threshold oxidation temperature by at least two hundred degrees.
ISSN:1005-0302
1941-1162
DOI:10.1016/j.jmst.2019.10.018