<strong>Ag</strong>微合金化对<strong>Mg-Zn-Ca</strong>合金微观组织及腐蚀行为的影响

doi:10.11902/1005.4537.2023.379

中国腐蚀与防护学报

2024, Vol. 44

Issue (5): 1274-1284 CSTR: 32134.14.1005.4537.2023.379 DOI: 10.11902/1005.4537.2023.379

研究报告

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Ag微合金化对Mg-Zn-Ca合金微观组织及腐蚀行为的影响

尹洁¹, 高永浩¹(

), 易芳²

1 中南大学材料科学与工程学院长沙 410083
2 中南大学湘雅口腔医学院长沙 410000

Effect of Ag Micro-alloying on Microstructure and Corrosion Behavior of Mg-Zn-Ca Alloy

YIN Jie¹, GAO Yonghao¹(

), YI Fang²

1 School of Materials Science and Engineering, Central South University, Changsha 410083, China
2 Hunan Xiangya Stomatological Hospital, Central South University, Changsha 410000, China

引用本文:

尹洁, 高永浩, 易芳. Ag微合金化对Mg-Zn-Ca合金微观组织及腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2024, 44(5): 1274-1284.
Jie YIN, Yonghao GAO, Fang YI. Effect of Ag Micro-alloying on Microstructure and Corrosion Behavior of Mg-Zn-Ca Alloy[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(5): 1274-1284.

全文: PDF(13992 KB) HTML

摘要:

采用OM、SEM、电化学测试和析氢失重等方法研究了Ag微合金化对铸态Mg-2Zn-0.2Ca合金微观组织和腐蚀行为的影响。研究表明，ZX20合金(1.63 ± 0.17 mm/a)耐蚀性强于含Ag的ZXQ200合金(4.06 ± 0.68 mm/a)，这主要源于第二相和基体间的电位差差异。ZX20合金的枝晶臂间距(69.8 ± 24.9 μm)小于ZXQ200合金的枝晶臂间距(85.9 ± 23.9 μm)，这可能是ZXQ200合金局部腐蚀深度更大的原因之一。两种合金均由α-Mg和Ca₂Mg₆Zn₃相组成且第二相体积分数相近，未发现富Ag相。Ag在第二相中的偏聚使得第二相与基体的电位差从约60 mV(ZX20合金)增加到约200 mV (ZXQ200合金)，提高了合金的微电偶腐蚀驱动力，导致合金点蚀孕育期缩短和局部腐蚀位点增加。

关键词 ：镁合金, Ag, 第二相, 微电偶腐蚀

Abstract：

The effect of Ag micro-alloying on the microstructure and corrosion behavior of the as-casted Mg-2Zn-0.2Ca (ZX20) alloy were investigated by means of OM, SEM, electrochemical tests, and hydrogen evolution mass loss method. The results reveal that the addition of 0.5% (mass fraction) Ag affects adversely the corrosion resistance of ZX20 alloy. The corrosion rate increases from 1.63 ± 0.17 mm/a for the ZX20 alloy to 4.06 ± 0.68 mm/a for the Ag-containing alloy (ZXQ200), primarily due to the potential difference between the second phase and the matrix. The dendrite arm spacing of the ZX20 alloy (69.8 ± 24.9 μm) is smaller than that of the ZXQ200 alloy (85.9 ± 23.9 μm), potentially contributing to the greater local corrosion depth observed in the ZXQ200 alloy. The two alloys all consist of α-Mg and Ca₂Mg₆Zn₃ phases with a similar volume fraction of the second phase, and no Ag-rich compounds have been detected for the Ag-alloyed ones. However, the Ag segregation in the second phase results in a heightened potential difference between the second phase and the substrate, elevating it from approximately 60 mV (ZX20) to about 200 mV (ZXQ200). This segregation enhances the micro-galvanic corrosion driving force in the ZXQ200 alloy, resulting in a shorter pitting gestation period and an increase in local corrosion sites.

Key words： Mg-alloy Ag second phase micro-galvanic corrosion

收稿日期: 2023-11-28 32134.14.1005.4537.2023.379

ZTFLH:

T146.2

基金资助:湖南省自然科学基金(2023JJ30673)

通讯作者: 高永浩，E-mail：yonghao.gao@outlook.com，研究方向为镁合金加工成形及表面防护

Corresponding author: GAO Yonghao, E-mail: yonghao.gao@outlook.com

作者简介: 尹洁，女，1999年生，硕士生

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表1 实验合金的化学成分 (mass fraction / %)

图1 Mg-2Zn-0.2Ca-xAg合金四元相图的垂直截面和两种合金的XRD图谱

图2 ZX20和ZXQ200合金的金相和SEM图

表2 图2中标记点的EDS结果

图3 ZX20和ZXQ200铸态合金的EPMA图

图4 ZX20和ZXQ200合金浸泡在37 ± 1℃恒温生理盐水中的析氢体积和析氢速率随时间的变化曲线

图5 ZX20和ZXQ200合金的开路电位曲线、阴极极化曲线和阳极极化曲线

表3 阴极极化曲线拟合结果

图6 ZX20和ZXQ200合金在37 ± 1℃的生理盐水中浸泡1 h后的电化学阻抗谱

表4 ZX20和ZXQ200合金的阻抗谱拟合结果

图7 ZX20和ZXQ200合金在37 ± 1℃的生理盐水中浸泡不同时间的宏观形貌及其腐蚀面积变化曲线图

图8 ZX20和ZXQ200合金在37 ± 1℃的生理盐水中浸泡30 min后的腐蚀形貌SEM图

图9 ZX20和ZXQ200合金在37±1℃的生理盐水中浸泡5 d后的腐蚀截面形貌

图10 ZX20和ZXQ200合金的SKPFM表面相对电势图及相应的电势变化曲线

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