Journal
CORROSION SCIENCE
Volume 207, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2022.110558
Keywords
Magnesium; Oxidation resistance; Composite oxide layer; Heat treatment
Funding
- National Natural Science Foundation of China [51871107, 52130101, 51631004]
- Natural Sci-ence Foundation of Jilin Province [20200201019JC]
- Top-notch Young Talent Program of China [W02070051]
- Chang Jiang Scholar Program of China [Q2016064]
- Fundamental Research Funds for the Central Universities
- Program for Innovative Research Team (in Science and Technology) in University of Jilin Province [2017TD-09]
- German Research Foundation (Deutsche Forschungsgemeinschaft DFG) [INST 275/3911]
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The paper investigated the effect of heat treatment on the oxidation resistance (OR) of Mg alloyed by CaO with different weight percentages. The experiment found that heat treatment at 400 degrees C led to significantly improved OR, particularly for Mg alloy with 3% CaO. The improvement in OR is attributed to the formation of a uniform and dense protective layer during the heat treatment.
The paper investigated the effect of heat treatment on the oxidation resistance (OR) of Mg alloyed by CaO with 1, 3 and 5 wt%. After heat treatment at 400 degrees C in Ar atmosphere, the increase of OR was most striking for CaO at 3 wt%. The improved OR is attributed to a uniform and dense, 50 nm thin protective MgO-CaO composite layer formed on the surface during heat treatment. The protective layer formation is largely caused by outward diffusion of Ca atoms and a gradient in the partial pressure of oxygen.
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