Effect of Scandium on Corrosion Resistance of Welded Joint of Al-6Mg-Zr Alloy
来源期刊：JOURNAL OF RARE EARTHS2005年第2期
论文作者：Tao Binwu LI Songmei Liu Jianhua
Key words：corrosion; Al-Mg-Sc alloy; exfoliation corrosion; welded joint; rare earths;
Abstract: The corrosion resistance of welded joints of Al-6Mg-Sc-Zr alloy was studied by neutral salt spray and exfoliation corrosion methods. The microstructure of welded joints was investigated by using optical microscope and transmission electron micrograph (TEM). It is demonstrated that the welded joints of Al-6Mg-Sc-Zr alloy are more corrosion resistance, comparing with Al-6Mg-Zr alloy. The addition of scandium in the alloy results in (Al3Sc, Zr) particles, potently refined grains and restrained recrystallization process. The formation of homogeneous, discontinuous distribution of β-phase in welded joints improves the corrosion resistance of welded joints of Al-Mg-Zr alloy with high level content of magnesium.
Tao Binwu1，LI Songmei1，Liu Jianhua1
(1.School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China)
Abstract:The corrosion resistance of welded joints of Al-6Mg-Sc-Zr alloy was studied by neutral salt spray and exfoliation corrosion methods. The microstructure of welded joints was investigated by using optical microscope and transmission electron micrograph (TEM). It is demonstrated that the welded joints of Al-6Mg-Sc-Zr alloy are more corrosion resistance, comparing with Al-6Mg-Zr alloy. The addition of scandium in the alloy results in (Al3Sc, Zr) particles, potently refined grains and restrained recrystallization process. The formation of homogeneous, discontinuous distribution of β-phase in welded joints improves the corrosion resistance of welded joints of Al-Mg-Zr alloy with high level content of magnesium.
Key words:corrosion; Al-Mg-Sc alloy; exfoliation corrosion; welded joint; rare earths;
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