期刊
JOURNAL OF RARE EARTHS
卷 32, 期 7, 页码 663-671出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S1002-0721(14)60123-X
关键词
AZ92 alloy; samarium; microstructure; precipitation; corrosion resistance; rare earths
资金
- National Hi-Tech R & D Program of China (863 Program) [2011AA03A409]
- Major State Basic Research Development Program of China (973 Program) [2012CBA01207]
The effects of samarium (Sm) on microstructure and corrosion resistance of AZ92 magnesium alloy were characterized and analyzed by scanning electronic microscopy, X-ray diffraction, mass loss test, electrochemical impedance spectroscopy, X-ray photoelectron spectroscopy and potentio-dynamic polarization test. The results showed that the added Sm could promote continuous precipitation of beta-Mg17Al12 phase in grains, and meanwhile restrain discontinuous precipitation of the same phase along the grain boundaries. Thus, the precipitations distributed more uniformly in the aged AZ92 magnesium alloys. When the content of Sm was 0.5 wt.%, the corrosion resistance of aged AZ92 alloy tended to be the best, which was due to the beta-phase distributes more homogeneous reducing the galvanic corrosion. The corrosion product film had more integrality and compactness than AZ92 alloys without Sm. However, it resulted in worse corrosion resistance of AZ92 alloy because of the formation of mass cathodic Al2Sm phase coming from excess Sm in AZ92 alloy.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据