| Electrochemical Properties of MAO/LDH Composite Film
on LA103Z Mg-Li Alloy |
Jumei Zhang,a, * Yang Zhang,a Kai Wang,a Xin Duan,a Cai Huia and Zhi-hu Wangb
Pages : 166-171
DOI : 10.1080/0371750X.2020.1791734 |
| Abstract |
| In order to improve the corrosion resistance of magnesium-lithium (Mg-Li)
alloy, a micro-arc oxidation (MAO) ceramic layer was first prepared on LA103Z
Mg-Li alloy, and then the MAO coating on LA103Z Mg-Li alloy was sealed by
layered double hydroxide (LDH) hydrothermal treatment. The obtained
samples were subjected to immersion test in 3.5% NaCl solution for 8 days.
The growth characteristics of different coatings before immersion were
studied by XRD, SEM and EDS. Morphology and composition of the coatings
were observed before and after corrosion. Electrochemical test of the
composite film was performed to explore the corrosion resistance and
influence of different time on corrosion resistance of MAO/LDH composite
film. The results displayed that MAO/LDH composite film have the lowest
corrosion current density, the most positive corrosion potential, can
effectively protect the substrate from corrosion by NaCl solution, improved
long-term corrosion protection, and can considerably improve the corrosion
resistance of the alloy.
[Keywords: Mg-Li alloy, Micro-arc oxidation, Layered double hydroxide,
Immersion experiment, Corrosion resistance] |
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