表面机械研磨对AZ31表面sol-gel法制备羟基磷灰石涂层的影响

发布时间：2018-03-10 06:16

本文选题：表面机械研磨　切入点：AZ镁合金　出处：《功能材料》2017年03期 　论文类型：期刊论文

【摘要】：采用表面机械研磨(surface mechanical attrition treatment,SMAT)技术对AZ31镁合金进行前处理,以氢氧化钙和磷酸二氢钙为前驱物,在AZ31镁合金表面通过溶胶-凝胶(sol-gel)法制备了羟基磷灰石涂层。利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)对涂层表面形貌、截面进行了分析表征,利用电化学工作站测试了该涂层的在生理盐水中的动电位极化曲线。结果表明,SMAT后样品上的HAP的结晶性增强,HAP涂层厚度由8μm增加到18μm,而且HAP涂层与SMAT处理过的基体间结合强度明显提高。动电位极化测试表明SMAT后样品的HAP涂层自腐蚀电流密度降低了50%,腐蚀电位正移了56.1mV,抗腐蚀性能明显增强。
[Abstract]:Surface mechanical attrition treatment-Smatt technique was used to pretreat AZ31 magnesium alloy. Calcium hydroxide and calcium dihydrogen phosphate were used as precursors. Hydroxyapatite coating was prepared on the surface of AZ31 magnesium alloy by sol-gel method. The surface morphology and cross-section of the coating were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrochemistry workstation was used to test the potentiodynamic polarization curve of the coating in normal saline. The results showed that the crystallization enhancement of HAP coating on the sample was increased from 8 渭 m to 18 渭 m, and the substrate treated with HAP coating and SMAT was increased from 8 渭 m to 18 渭 m. The dynamic potential polarization test showed that the corrosion current density of the HAP coating decreased by 50%, the corrosion potential shifted positively by 56.1 MV, and the corrosion resistance was obviously enhanced.
【作者单位】：山西医科大学基础医学院;太原理工大学材料科学与工程学院;山西工程技术学院;
【基金】：国家自然科学基金资助项目(51001079,51374151,61505101) 山西省自然科学基金资助项目(2011011020-2,2010021023-1) 中国博士后科学基金资助项目(20100471586) 山西医科大学青年基金资助项目(2012-057546)
【分类号】：TG174.4

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