论文部分内容阅读
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25μm增加到SMATed+HAP样品的40μm,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80.3m V,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。
AZ31 magnesium alloy was pre-treated by Surface Mechanical Abrasive (SMAT) technique, and then hydroxyapatite (HAP) film was prepared on the surface by electrochemical deposition. The phase structure, surface morphology and film adhesion of the film were analyzed by XRD, SEM, 3D optical profilometer and tape adhesion test. The results show that the crystallinity of HAP on SMATed samples is enhanced compared to that of non-SMATed samples, the deposition rate of HAP films on SMATed samples is significantly increased, and the HAP film thickness is increased from 25μm in non-SMATed samples to SMATed + HAP samples Of 40μm, and HAP film and SMATed matrix significantly increased the binding strength. The results of EIS and EIS showed that the self-corrosion current density of SMATed + HAP samples was reduced by 30.84% and the corrosion potential was shifted by 80.3mV compared with that of non-SMATed + HAP samples. The corrosion resistance was significantly enhanced. The SMATed + HAP samples showed better biological activity in simulated humoral immersion experiments. The average weight loss rate of the samples decreased from 0.87 mg · mm-2 · h-1 for non-SMATed + HAP samples to 0.46 for SMATed samples mg · mm-2 · h-1.