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采用表面机械研磨(SMAT)技术对AZ31镁合金进行前处理,然后通过电化学沉积方法在其表面制备羟基磷灰石(HAP)膜层.采用XRD、SEM、3D光学轮廓仪及胶带法附着力测试对膜层的物相结构、表面形貌和膜层的结合力进行了分析.结果表明,SMATed样品上的HAP的结晶性较non-SMATed样品的增强,HAP膜在SMATed样品上的沉积速率明显增大,HAP膜层厚度由在non-SMATed样品的25 μm增加到SMATed+ HAP样品的40 μm,而且HAP膜层与SMATed基体间结合强度明显提高.动电位极化、EIS测试表明SMATed+ HAP样品的自腐蚀电流密度比non-SMATed+ HAP样品降低了30.84%,腐蚀电位正移了80.3mV,抗腐蚀性能明显增强.在模拟体液的浸泡实验中SMATed+ HAP样品表现出更好的生物活性,样品的的平均腐蚀失重率由non-SMATed+ HAP样品的0.87 mg·mm-2·h-1降低到SMATed样品的0.46 mg·mm-2·h-1.

参考文献

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