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中南大学学报(英文版)

Journal of Central South University

Vol. 27    No. 6    June 2020

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Microstructure and corrosion behavior of as-cast ADC12 alloy with rare earth Yb addition and hot extrusion
HE Jia-jia(贺佳佳)1, 2, YAN Hong(闫洪)1, 2, ZOU Yong-cheng(邹永成)1, 2, YU Bao-biao(喻保标)1, 2, HU Zhi(胡志)1, 2

1. School of Mechanical and Electrical Engineering, Nanchang University, Nanchang 330031, China;
2. Key Laboratory of Light Alloy Preparation and Processing in Nanchang City, Nanchang 330031, China

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.

 

Key words: ADC12 alloy; rare earth Yb addition; hot extrusion; microstructure; corrosion resistance

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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