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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 79  2020
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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