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首页> 外文期刊>Coatings >Tunable Microstructure and Morphology of the Self-Assembly Hydroxyapatite Coatings on ZK60 Magnesium Alloy Substrates Using Hydrothermal Methods
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Tunable Microstructure and Morphology of the Self-Assembly Hydroxyapatite Coatings on ZK60 Magnesium Alloy Substrates Using Hydrothermal Methods

机译：水热法测定ZK60镁合金基材上自组装羟基磷灰石涂层的可调谐组织及形态

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摘要

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.
机译：羟基磷灰石涂料已被广泛用于改善可生物降解镁合金的耐腐蚀性。在本文中，为了通过水热法在ZK60镁基板上制造理想的羟基磷灰石（HA）涂层，增强羟基磷灰石（HA）涂层的形成机理，前体溶液对HA形态，耐腐蚀性和腐蚀性和腐蚀性和腐蚀性溶液的影响已经研究了HA涂层的细胞毒性。结果表明，HA的生长模式受局部pH值的影响。 HA具有优选的C轴和更高的结晶度，在碱性环境中发育纳米棒状结构，而在酸和中性环境中，它具有沿着（B） - 普通的优先生长，具有较低的结晶度，显影纳米片状物结构体。不同的形态和微观结构导致海涂层的不同降解行为和性能。浸没和电化学试验表明，中性环境促进了具有高耐腐蚀性的HA涂层的形成。细胞培养实验证实，增强的耐腐蚀性确保了基材涂层系统的生物相容性。通常，在中性环境中制备的HA涂层显示出镁合金表面改性的巨大潜力。

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