Effect of heat treatment on oxidation resistance of magnesium alloys with additions of calcium oxide

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 ºC 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 prot...

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Bibliographic Details
Published in:Corrosion science 2022-10, Vol.207, p.110558, Article 110558
Main Authors: Liu, S.Y., Liu, G.J., Yu, C., Lippmann, S., Zhu, Y.F., Jiang, Q.
Format: Article
Language:English
Subjects:
Composite oxide layer
Heat treatment
Magnesium
Oxidation resistance
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Summary: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 ºC 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. •A preheating treatment was carried out for Mg-xCaO at 400 ºC in Ar inert atmosphere.•The oxidation resistance was improved by the preheating especially for Mg-3CaO alloys oxidized in 0.1 MPa O2 at 400 ºC.•The improvement is attributed to a protective CaO-MgO composite film formed on the surface.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2022.110558