AZ91D镁合金基钙磷/壳聚糖/CNTs骨植入材料在m-SBF中腐蚀行为的研究

In vitro corrosion behavior of AZ91D magnesium alloy based calcium phosphate/chitosan/CNTs bone implant material in the m-SBF

目的:研究AZ91D镁合金基钙磷/壳聚糖/CNTs骨植入材料在模拟体液(m-SBF)中的腐蚀行为,并提出腐蚀机制。方法:将电泳沉积技术所制备的AZ91D镁合金基钙磷/壳聚糖/CNTs浸泡于m-SBF,通过电化学交流阻抗(EIS)和塔菲尔(Tafel)曲线测试考察材料在m-SBF中腐蚀过程,采用电感耦合等离子体发射光谱(ICP-OES)测试m-SBF中镁元素浓度。结果:随浸泡时间的增加,AZ91D基钙磷/壳聚糖/CNTs在m-SBF中腐蚀反应依次由电化学和有限层扩散过程、电化学和半无限扩散过程和半无限扩散过程控制,钙磷/壳聚糖/CNTs陶瓷膜层显著提高了AZ91D的腐蚀阻抗。结论:钙磷/壳聚糖/CNTs膜层可以保护AZ91D镁合金基体在m-SBF中的腐蚀。

Objective： To study in vitro degradation behavior of AZ91 D magnesium alloy based calcium phosphate/chitosan/CNTs in m- SBF. Methods： AZ91 D magnesium alloy based calcium phosphate/chitosan/CNTs prepared by electrophoretic deposition technique was immersed in the m- SBF. The corrosion process of sample in the m- SBF was tested through electrochemical impedance and Tafel curve. Magnesium concentration in the m-SBF was measured by inductively coupled plasma emission spectrum. Results： The corrosion reaction of AZ91 D based Ca P/chitosan in m- SBF was orderly controlled by electrochemical and limited layer diffusion process,electrochemical and semi- infinite diffusion process,and semi- infinite diffusion process with immersion time. Calcium phosphate/chitosan/CNTs ceramic film significantly improved the corrosion resistance of AZ91 D. Conclusion：Calcium phosphate/chitosan/CNTs coating can protect the corrosion of AZ91 D magnesium alloy substrate in the m- SBF.