Back to Search
Start Over
Effect of Rare Earth La on Microstructure, Hardness and Corrosion Resistance of A356 Aluminum Alloy.
- Source :
- Metals & Materials International; Sep2024, Vol. 30 Issue 9, p2490-2502, 13p
- Publication Year :
- 2024
-
Abstract
- 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-Al<subscript>5</subscript>FeSi 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<superscript>−2</superscript>) was 24.8% lower than that of the matrix (176.24 μA cm<superscript>−2</superscript>), and the polarization resistance (668.56 Ω cm<superscript>2</superscript>) was 235.2% higher than that of the matrix (199.47 Ω cm<superscript>2</superscript>). 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]
Details
- Language :
- English
- ISSN :
- 15989623
- Volume :
- 30
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- Metals & Materials International
- Publication Type :
- Academic Journal
- Accession number :
- 179504856
- Full Text :
- https://doi.org/10.1007/s12540-024-01654-4