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采用交流脉冲沉积法在AZ91D镁合金表面合成了羟基磷灰石涂层。考察了交流脉冲电压、沉积时间及电解液添加剂等电化学沉积参数对羟基磷灰石涂层的形貌、微观结构、元素组成及电化学性能的影响。结果表明,当脉冲电压为110 V时,纳米级别的羟基磷灰石涂层表面更为均匀,孔隙度更小,且其XRD的特征衍射峰更为突出。当电解液中添加了NaN O3和H2O2后,羟基磷灰石颗粒和涂层表面形貌均得到优化;同时,极化曲线和交流阻抗测试结果表明该涂层在模拟体液中的耐蚀性能提高。浸泡实验结果表明,该涂层有利于诱导羟基磷灰石的形成,从而提高涂层的生物活性。
The hydroxyapatite coating was synthesized on the surface of AZ91D magnesium alloy by AC pulse deposition. The effects of AC pulse voltage, deposition time and electrochemical deposition parameters such as electrolyte additives on the morphology, microstructure, elemental composition and electrochemical performance of hydroxyapatite coatings were investigated. The results show that when the pulse voltage is 110 V, the surface of nano-sized hydroxyapatite coating is more uniform and the porosity is smaller, and the characteristic diffraction peaks of XRD are more prominent. When NaN O3 and H2O2 were added into the electrolyte, the surface morphology of the hydroxyapatite particles and the coating were optimized. Meanwhile, the polarization curve and AC impedance test results showed that the corrosion resistance of the coating in simulated body fluid increased . The results of immersion experiments show that the coating is conducive to the formation of hydroxyapatite, thereby enhancing the bioactivity of the coating.