Gd对Mg-<i>x</i>Gd-1Er-1Zn-0.6Zr合金显微组织和腐蚀行为的影响

doi:10.11868/j.issn.1001-4381.2020.001140

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摘要

采用重力铸造法制备Gd含量分别为7%(质量分数，下同)，9%和11%的Mg-xGd-1Er-1Zn-0.6Zr合金，利用光学显微镜、扫描电镜和X射线衍射仪等研究合金的显微组织，通过开路电位、动电位极化和电化学阻抗测试等方法研究合金在3.5%NaCl溶液中的腐蚀行为。结果表明：当Gd含量从7%增至11%时，开路电位峰值时间从1609 s降为851 s，电荷转移电阻从588.5 Ω降至31.9 Ω，腐蚀电流密度从2.21×10^-5 A/cm²增至3.97×10^-5 A/cm²，说明随着Gd含量的增加，合金耐蚀性下降，这主要归因于第二相的微电偶腐蚀效应和腐蚀屏障效应共同作用。当Gd含量从7%增至11%时，(Mg, Zn)₃(Gd, Er)相体积分数从1.9%增至5.2%，并从沿晶界不连续分布转变为半连续分布，层片状LPSO相体积分数从11.7%增至26.7%，并沿着晶界贯穿晶粒内部，(Mg, Zn)₃(Gd, Er)相和层片状LPSO相体积分数的增加导致合金耐腐蚀性能下降，但大量细小层状LPSO相也能阻止腐蚀扩展，使得Gd含量为11%的合金在8~24 h内腐蚀速率增长减缓。

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关键词 ： Mg-Gd-Er-Zn-Zr合金, 微电偶腐蚀, 腐蚀屏障, 第二相, 显微组织

Abstract：

The Mg-xGd-1Er-1Zn-0.6Zr alloys with Gd contents of 7%(mass fraction), 9% and 11% were prepared by gravity casting method.The microstructure of the alloys was studied by means of optical microscope, scanning electron microscope and X-ray diffractometer.The corrosion behavior of the alloys were evaluated by means of open circuit potential, potentiodynamic polarization and electrochemical impedance spectroscopy measurements in 3.5%NaCl solution.The results show that when Gd content increases from 7% to 11%, the peak time of open circuit potential decreases from 1609 s to 851 s, the charge transfer resistance decreases from 588.50 Ω to 31.9 Ω, the corrosion current density increases from 2.21×10^-5 A/cm² to 3.97×10^-5 A/cm², indicating that the corrosion resistance of the alloys decreases with the increase of Gd content.It is attributed to the combined operation of the micro-galvanic corrosion effect as well as corrosion barrier effect of second phase.When the Gd content increases from 7% to 11%, the volume fraction of (Mg, Zn)₃(Gd, Er) phase increases from 1.9% to 5.2%, and changes from discontinuous distribution to semi-continuous distribution along grain boundaries, the volume fraction of the lamellar-shape LPSO phase increases from 11.7% to 26.7% and penetrates into grains.The increase in the volume fraction of the (Mg, Zn)₃(Gd, Er) phase and the lamellar-shape LPSO phase results in the decrease of corrosion resistance, however, a large number of fine lamellar-shape LPSO phases is able to prevent the corrosion from spreading and slow down the growth of corrosion rate of the alloy with 11%Gd content in 8-24 h.

Key words： Mg-Gd-Er-Zn-Zr alloy micro-galvanic corrosion corrosion barrier second phase micro-structure

收稿日期: 2020-12-16 出版日期: 2022-09-20

中图分类号:

TG146.2

基金资助:国家重点研发计划(2016YFB0301101);国家重点研发计划(2016YFB0301001);北京市教委重点课题(KZ201810005005)

通讯作者: 杜文博 E-mail: duwb@bjut.edu.cn

作者简介: 杜文博(1964—)，男，教授，博士，主要从事高性能镁合金及镁基复合材料研究，联系地址：北京市朝阳区平乐园100号北京工业大学材料与制造学部(100124)，E-mail: duwb@bjut.edu.cn

引用本文:

刘雄飞, 杜文博, 付军健, 王云峰, 李淑波, 朱训明, 王朝辉. Gd对Mg-xGd-1Er-1Zn-0.6Zr合金显微组织和腐蚀行为的影响[J]. 材料工程, 2022, 50(9): 159-168.
Xiongfei LIU, Wenbo DU, Junjian FU, Yunfeng WANG, Shubo LI, Xunming ZHU, Zhaohui WANG. Effect of Gd on microstructure and corrosion behavior of Mg-xGd-1Er-1Zn-0.6Zr alloys. Journal of Materials Engineering, 2022, 50(9): 159-168.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2020.001140 或 http://jme.biam.ac.cn/CN/Y2022/V50/I9/159

Table 1 三种合金的名义成分与实际成分(质量分数/%)

Fig.1 铸态Mg-xGd-1Er-1Zn-0.6Zr合金的X射线衍射图谱

Fig.2 铸态Mg-xGd-1Er-1Zn-0.6Zr合金光学显微组织
(a)合金A；(b)合金B；(c)合金C

Fig.3 铸态Mg-xGd-1Er-1Zn-0.6Zr合金的SEM图
(a)合金A；(b)合金B；(c)合金C

Table 2 图 3各点对应的EDS结果(原子分数/%)

Fig.4 铸态Mg-xGd-1Er-1Zn-0.6Zr合金在3.5%NaCl溶液中的开路电位变化

Fig.5 铸态Mg-xGd-1Er-1Zn-0.6Zr合金在3.5%NaCl溶液中的电化学阻抗谱
(a)Nyquist图；(b)Bode图

Fig.6 铸态Mg-xGd-1Er-1Zn-0.6Zr合金电化学阻抗谱的等效电路
(a)合金A；(b)合金B和合金C

Table 3 铸态Mg-xGd-1Er-1Zn-0.6Zr合金电化学阻抗谱拟合结果

Fig.7 铸态Mg-xGd-1Er-1Zn-0.6Zr合金的动态电位极化曲线

Table 4 铸态Mg-xGd-1Er-1Zn-0.6Zr合金的电化学参数

Fig.8 合金A在3.5%NaCl溶液中浸泡不同时间后带有腐蚀产物的表面形貌
(a)0 h；(b)1 h；(c)4 h；(d)14 h

Fig.9 合金A在3.5%NaCl溶液中浸泡不同时间后带有腐蚀产物的SEM图
(a)1 h；(b)4 h

Table 5 图 9各点对应的EDS结果(原子分数/%)

Fig.10 铸态Mg-xGd-1Er-1Zn-0.6Zr合金在3.5%NaCl溶液中浸泡8 h后腐蚀产物的XRD谱图

Fig.11 铸态Mg-xGd-1Er-1Zn-0.6Zr合金在3.5%NaCl溶液中浸泡不同时间后去掉腐蚀产物的腐蚀形貌
(a)合金A；(b)合金B；(c)合金C；(1)1 h；(2)14 h；(3)24 h

Fig.12 铸态Mg-xGd-1Er-1Zn-0.6Zr合金失重腐蚀速率

Fig.13 铸态Mg-xGd-1Er-1Zn-0.6Zr合金随浸泡时间延长的腐蚀机理示意图

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