| Morphology and Corrosion Resistance of MAO/Mg-Al LDH
Composite Film Obtained on LA103Z Mg-Li Alloy at
Different Temperatures |
Jumei Zhang,a,* Yang Zhang,a Kai Wang,a Xin Duan,a Cai Huia and Zhihu Wangb
Pages : 6-11
DOI : 10.1080/0371750X.2020.1855252 |
| Abstract |
| A solution of Al(NO3)3.9H2O and NaOH was used to perform Mg-Al LDH plugging
treatment on the LA103Z magnesium-lithium alloy micro-arc oxidation ceramic layer.
The effect of treatment temperature on the micro-arc oxidation ceramic layer structure
and corrosion resistance was studied. The formation mechanism of Mg-Al LDH film
and corrosion mechanism of the film layer were discussed. The results show that the
sealing essence of Mg-Al LDH is that the Mg2+ obtained by dissolving the MgO
component of the MAO film layer is combined with OH– in the hydrothermal solution
to form a layered Mg(OH)2, the formation of LDH tends to be inside the pores. In the
lower temperature range, the temperature increase is conducive to the increase and
thickening of the LDH layer and the film layer is dense and corrosion resistant. In the
higher temperature range, the increase in temperature is conducive to the increase in
the size of the LDH layer. The layer is loose and coarse, and the corrosion resistance
is reduced. The composite film is the densest at 90oC, and its insulation and corrosion
resistance are better than the composite film obtained at other temperatures, the
MAO film and the substrate. |
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