| Comparative Study on Corrosion Resistance of Binary and
Ternary Layered Double Hydroxide Films on Magnesium
Lithium Alloy
|
Jumei Zhang,* Duoduo Lian, Mengchun Zhang, Anrong Hou, Jiacheng Li and Teng Zhang
Pages : 129-135
DOI :10.1080/0371750X.2023.2189624 |
| Abstract |
| Layered double hydroxide (LDH) (Mg-Al and Mg-Al-Co) films were prepared on the surface
of LA103Z magnesium-lithium alloy by hydrothermal synthesis method. Corrosion
resistance of binary and ternary LDH coatings was studied by comparison. Structures of
the two films were characterized using XRD, FTIR, SEM and EDS, and the corrosion
resistance of the films was evaluated by polarization curve, EIS, and hydrogen evolution
rate during immersion in 3.5 wt% NaCl solution. Results showed that Mg-Al LDH film
was tightly bonded to the substrate and had a large number of nanosheets growing
perpendicular to the substrate, while Mg-Al-Co LDH film was thinner with a smaller size
and fewer nanosheets. Electrochemical test results showed that the polarization
resistance of Mg-Al and Mg-Al-Co LDH films was two orders of magnitude higher than
that of the substrate. Hydrogen precipitation experiments showed that corrosion
resistance of both the films was improved compared to the substrate, and the films
played a protective role for the substrate, among which the corrosion resistance of the
Mg-Al LDH layer was better than that of the Mg-Al-Co LDH layer.
[Keywords: LA103Z magnesium-lithium alloy, LDH film, Microstructure, Corrosion
resistance] |
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