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Microstructure and corrosion behavior of as-cast ADC12 alloy with rare earth Yb addition and hot extrusion

添加稀土 Yb 及热挤压后铸态 ADC12 合金的微观组织及腐蚀行为

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Abstract

The effects of rare earth ytterbium (Yb) addition and hot extrusion on the microstructure and corrosion behavior of as-cast ADC12 were studied by optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The experimental results demonstrate that both the Si phase and β-Al5FeSi phase in the alloy with 0.9 wt% Yb have been remarkably refined, and the Al3Yb intermetallic compound has also been obtained. The Si, β-Al5FeSi, and rare earth phases are further refined in the alloy at 0.9 wt% Yb and hot extrusion. The results of the immersion corrosion tests and electrochemical experiments show that the corrosion current density (8.56 µA/cm2) of the alloy with 0.9 wt% Yb addition and hot extrusion is 50.6% lower than the untreated alloy (17.33 µA/cm2), and the polarization resistance (9252 Ω·cm2) was 71.3% higher than the untreated alloy (2654 Ω·cm2). The corrosion in the cathode phase in the micro-battery was refined to varying degrees attributable to the addition of Yb and hot extrusion, where the cathode reaction in the corrosion process caused a decrease of the corrosion rate.

摘要

通过光学显微镜(OM)、扫描电子显微镜(SEM)、能谱仪(EDS)和 X 射线衍射(XRD)研究了稀土 Yb 的添加及热挤压对铸态 ADC12 合金的微观组织及腐蚀性为的影响. 结果表明, 添加 0.9% Yb 后, 合金中的 Si 相和 β-Al5 FeSi 相都得到了显著的细化, 并且还获得了 Al3 Yb 金属间化合物. 热挤压后的稀土合金的 Si 相、 β-Al5 FeSi 相以及稀土相进一步细化. 浸泡腐蚀实验和电化学实验发现, 热挤压后稀土铝合金的腐蚀电流密度(8.56 µA/cm2)比未处理合金的(17.33 µA/cm2)低50.6%, 极化电阻(9252 Ω·cm2)比未处理合金的(2654 Ω·cm2)高71.3%. 热挤压及稀土 Yb 的添加在不同程度上细化了腐蚀微电池中的阴极相, 从而使得腐蚀过程中的阴极反应速率降低.

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Authors and Affiliations

  1. School of Mechanical and Electrical Engineering, Nanchang University, Nanchang, 330031, China

    Jia-jia He  (贺佳佳), Hong Yan  (闫洪), Yong-cheng Zou  (邹永成), Bao-biao Yu  (喻保标) & Zhi Hu  (胡志)

  2. Key Laboratory of Light Alloy Preparation and Processing in Nanchang City, Nanchang, 330031, China

    Jia-jia He  (贺佳佳), Hong Yan  (闫洪), Yong-cheng Zou  (邹永成), Bao-biao Yu  (喻保标) & Zhi Hu  (胡志)

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  1. Jia-jia He  (贺佳佳)
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  2. Hong Yan  (闫洪)
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Correspondence to Hong Yan  (闫洪).

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Foundation item: Project(51965040) supported by the National Natural Science Foundation of China; Project(20181BAB206026) supported by the Natural Science Foundation of Jiangxi Province, China

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He, Jj., Yan, H., Zou, Yc. et al. Microstructure and corrosion behavior of as-cast ADC12 alloy with rare earth Yb addition and hot extrusion. J. Cent. South Univ. 27, 1654–1665 (2020). https://doi.org/10.1007/s11771-020-4397-8

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