正挤压态Mg-1Zn-1Ca合金的显微组织及其在SBF溶液中的腐蚀行为

发布时间：2018-05-18 13:31

本文选题：Mg-Zn-Ca合金 + 正挤压　；参考：《金属学报》2015年08期

【摘要】：通过合金化、均匀化热处理和正挤压制备Mg-1Zn-1Ca(质量分数,%)合金,采用电化学方法、浸泡腐蚀法研究合金在人体模拟体液(SBF)中的腐蚀行为.采用OM和SEM观察合金组织和腐蚀产物层形貌,用SEM附带的EDS分析合金相成分和腐蚀产物成分,采用Fourier变换红外吸收光谱对腐蚀产物官能团进行结构分析,结合XRD结果确定腐蚀产物的相组成.结果表明,Mg-1Zn-1Ca合金由a-Mg,Mg2Ca和Ca2Mg6Zn3组成.在SBF溶液中浸泡72 h后,Mg-1Zn-1Ca合金的腐蚀产物为HA(Ca10(OH)2(PO4)6),Ca CO3,Mg Cl2和Mg(OH)2.在浸泡腐蚀过程中,高活性的Mg2Ca相作为阳极率先发生腐蚀,从而对周围a-Mg基体起到一定保护作用,而Ca2Mg6Zn3相活性最低,加剧了a-Mg基体的腐蚀.正挤压态合金耐蚀性能优于铸态合金的耐蚀性能.
[Abstract]:Mg-1Zn-1Caalloy was prepared by alloying, homogenizing heat treatment and forward extrusion. The corrosion behavior of Mg-1Zn-1Caalloy in human body simulated body fluid SBF was studied by means of electrochemical method and immersion corrosion method. The microstructure and corrosion product layer morphology of the alloy were observed by OM and SEM. The phase composition and corrosion product composition of the alloy were analyzed by EDS accompanied by SEM. The structure of the functional group of the corrosion product was analyzed by Fourier transform infrared absorption spectrum. The phase composition of corrosion products was determined by XRD. The results show that the Mg-1Zn-1Ca alloy is composed of a-Mg-Mg2Ca and Ca2Mg6Zn3. After being immersed in SBF solution for 72 h, the corrosion products of Mg-1Zn-1Ca alloy are Ha-Ca10OHH _ 2O _ 4O _ 4O _ 4O _ 4H _ 4O _ 4, Ca _ CO _ 3H _ 3O _ 3, mg Cl2 and mg _ 2O _ (2) O _ (2) O _ (2). In the process of immersion corrosion, the highly active Mg2Ca phase is the first anode to corrode, thus it can protect the surrounding a-Mg matrix to some extent, while the Ca2Mg6Zn3 phase has the lowest activity, which intensifies the corrosion of a-Mg matrix. The corrosion resistance of the extruded alloy is better than that of the as-cast alloy.
【作者单位】：西安理工大学材料科学与工程学院陕西省电工材料与熔(浸)渗技术重点实验室;西安工业大学材料与化工学院陕西省光电功能材料与器件重点实验室;
【基金】：陕西省科技计划项目2010K10-08 陕西省教育厅科学研究计划项目2013JK0906 陕西省光电功能材料与器件重点实验室项目ZSKJ201302资助~~
【分类号】：TG146.22

【参考文献】