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*
录用日期: 2015-03-27
网络出版日期: 2015-08-27
基金资助
* 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和陕西省光电功能材料与器件重点实验室项目ZSKJ201302资助
MICROSTRUCTURE OF DIRECTLY EXTRUDED Mg-1Zn-1Ca ALLOY AND ITS CORROSION BEHAVIOR IN SBF SOLUTION
Accepted date: 2015-03-27
Online published: 2015-08-27
Supported by
Supported by Shaanxi Provincial Science and Technology Plan Project (No.2010K10-08), Scientific Research Project of Education Department of Shaanxi Province (No.2013JK0906) and Research Project of Key Laboratory of Electrical Materials and Infiltration Technology of Shaanxi Province (No.ZSKJ201302)
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), CaCO3, MgCl2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.
关键词： Mg-1Zn-1Ca合金; 正挤压; 微观组织; SBF溶液; 腐蚀机理
张忠明,余凯,任伟伟,马莹,徐春杰,惠增哲 . 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*[J]. 金属学报, 2015 , 51(8) : 985 -992 . DOI: 10.11900/0412.1961.2014.00652
The as-extruded Mg-1Zn-1Ca (mass fraction, %) alloys was fabricated successively by alloying, homogenization treatment and hot extrusion. The corrosion behavior of the alloy in simulated body fluid (SBF) solution was evaluated by electrochemical test and immersion test. The microstructure and morphology of corrosion product were observed by OM and SEM. Compositions of corrosion layer and different phases were investigated by EDS analysis. Fourier Transform infrared spectroscopy was also conducted to identify the functional groups in the corrosion products and XRD was also used to determine the phase constitutes of the corrosion products. The results show that Mg-1Zn-1Ca alloy consists of three phases, i.e. a-Mg, Mg2Ca and Ca2Mg6Zn3. After immersion in SBF solution for 72 h, the corrosion products is composed of HA (Ca10(OH)2(PO4)6), CaCO3, MgCl2 and Mg(OH)2. During the stage of immersion, the high active Mg2Ca phases act as the anode and corrode first, so they protect the around a-Mg substrate; the Ca2Mg6Zn3 phases are the lowest active, so they accelerate the corrosion of around α-Mg substrate. The corrosion resistance of as-cast Mg-1Zn-1Ca alloy are better than as-extruded alloy.
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