| Autor: |
Cheng, Zijian, Yan, Hong, Zhang, Shuqing, Zou, Xiuliang, Cao, Chuanliang |
| Zdroj: |
Metals & Materials International; Sep2024, Vol. 30 Issue 9, p2490-2502, 13p |
| Abstrakt: |
The effects of rare earth La on the microstructure, hardness, and corrosion resistance of A356 aluminum alloy were investigated by optical microscopys, scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. The experimental results showed that with the addition of rare earth La, the microstructure was refined, and both Si phases and β-Al5FeSi phases were transformed from long needle-like to short rod-like. The optimal microstructure and mechanical properties of the alloy were obtained when 0.6 wt% La was added. Compared with A356 aluminum alloy (88.36 HV), the hardness of A356 aluminum alloy modified with 0.6 wt% La (106.83 HV) was increased by 20.1%. The results of the immersion corrosion test and electrochemical experiments showed that the corrosion current density of A356 aluminum alloy modified with 0.6 wt% La (132.51 μA cm−2) was 24.8% lower than that of the matrix (176.24 μA cm−2), and the polarization resistance (668.56 Ω cm2) was 235.2% higher than that of the matrix (199.47 Ω cm2). This may be because the addition of rare earth La significantly reduced the cathode phases grain size in the corrosion micro-battery as well as the formation of intermetallic compounds containing rare earth La, leading to a decrease in the reaction rate of the cathode during corrosion. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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