Tunable Microstructure and Morphology of the Self-Assembly Hydroxyapatite Coatings on ZK60 Magnesium Alloy Substrates Using Hydrothermal Methods
| Autor: | Chao Lin, Taolei Wang, Dan Batalu, Wei Lu, Jingzhou Hu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
biomedical applications
Materials science corrosion resistance Biocompatibility Magnesium chemistry.chemical_element hydroxyapatite Surfaces and Interfaces engineering.material Microstructure Hydrothermal circulation Surfaces Coatings and Films Corrosion Crystallinity chemistry Chemical engineering Coating lcsh:TA1-2040 Materials Chemistry engineering Surface modification grain growth lcsh:Engineering (General). Civil engineering (General) |
| Zdroj: | Coatings, Vol 11, Iss 8, p 8 (2021) Coatings Volume 11 Issue 1 |
| ISSN: | 2079-6412 |
| Popis: | Hydroxyapatite coatings have been widely used to improve the corrosion resistance of biodegradable magnesium alloys. In this paper, in order to manufacture the ideal hydroxyapatite (HA) coating on the ZK60 magnesium substrate by hydrothermal method, formation mechanism of enhanced hydroxyapatite (HA) coatings, influence of pH values of the precursor solution on the HA morphology, corrosion resistance and cytotoxicity of HA coatings have been investigated. Results show that the growth pattern of the HA is influenced by the local pH value. HA has a preferential c-axis and higher crystallinity in the alkaline environment developing a nanorod-like structure, while in acid and neutral environments it has a preferential growth along the a(b)-plane with a lower crystallinity, developing a nanosheet-like structure. The different morphology and microstructure lead to different degradation behavior and performance of HA coatings. Immersion and electrochemical tests show that the neutral environment promote formation of HA coatings with high corrosion resistance. The cell culture experiments confirm that the enhanced corrosion resistance assure the biocompatibility of the substrate-coating system. In general, the HA coating prepared in neutral environment shows great potential in surface modification of magnesium alloys. |
| Databáze: | OpenAIRE |
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