Superhydrophobic and Self-Healing Mg-Al Layered Double Hydroxide/Silane Composite Coatings on the Mg Alloy Surface with a Long-Term Anti-corrosion Lifetime
| Autor: | Jibin Pu, Minhao Yin, Jianning Ding, Xingyi Zhou, Ying Wang, Ningyi Yuan |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Alloy Composite number Anti-corrosion Surfaces and Interfaces engineering.material Condensed Matter Physics Silane Corrosion chemistry.chemical_compound Coating chemistry Electrochemistry engineering Hydroxide General Materials Science Composite material Layer (electronics) Spectroscopy |
| Zdroj: | Langmuir. 37:8129-8138 |
| ISSN: | 1520-5827 0743-7463 |
| Popis: | Both a superhydrophobic structure and layered double hydroxide (LDH) coating were effective to improve the corrosion resistance of alloys. In this study, a superhydrophobic composite coating based on LDHs was constructed on Mg alloy by laser treatment, in situ growth of Mg-Al LDHs, and modification with octadecyl-trimethoxy-silane (OTS). The so-obtained composite coating was coded as L-LDHs-OTS, where L stands for laser treatment. Results showed that the L-LDHs-OTS composite coating presented the best anti-corrosion performance and the corrosion current density was reduced by about 5 orders of magnitude compared with that of the Mg alloy substrate. The excellent corrosion resistance was related to the superhydrophobicity of the composite coating, the compactness and ion-exchange capacity of the LDH layer, and the dense Si-O-Si network within the OTS layer. Moreover, the L-LDHs-OTS composite coating was still effective after 20 days of immersion tests, showing good long-term corrosion resistance due to the existence of hydrophobicity of the composite coating and the self-healing ability of LDHs. |
| Databáze: | OpenAIRE |
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