研究了纯铝、Al-Si和AL-Mg合金在350～450℃熔融钠中的腐蚀行为。采用OM、XRD、EDAX和EPMA分析了腐蚀产物的组织形貌和合金元素的分布。实验结果表明高纯铝受到轻微的腐蚀,并非完全“免蚀”。工业纯铝的腐蚀较明显,主要发生在杂质偏聚的晶界附近。铝合金的腐蚀程度取决于杂质元素尤其是硅的含量。铝中添加一定量的镁并用微量锆细化晶粒可改善合金对熔融钠的耐蚀性。铝和铝合金的腐蚀产物经测定为AINaSi相。
Corrosion behaviour of high purity aluminium(99.999%Al), industrial high purity aluminium(LGl, 99.85%), Al-Si and Al-Mg alloys immersed in molten chemically pure sodium at 350-450℃ for 25-100h have been investigated. Structural morphology and alloying element distributions of the specimens were analysed with the aid of OM, SEM, XRD and EPMA methods. Experiments indicated that high purity aluminium immersed in molten sodium was attacked slightly instead of completely immune. The molten sodium corrosivity to aluminium depended on existing impurity, especially silicon. Addition of magnesium to some content and microalloying of zirconium as grain fining agent can improve the corrosion resistance of aluminium. Corrosion product formed on the surface of aluminium and its alloys was characterized as AlNaSi phase.
参考文献
| [1] | Mennicke S. In: Solid State Ionics, Edited by Balkanski M, Takahashi T, Tuller H L. Elsevier Science Publishers, 1992, p.3 |
| [2] | Zhang D, Okuyama R, Normura E, Matsumaru Y. J. Power Sources, 1994, 47:45 |
| [3] | Massalski T B, Binary Alloy Phase Diagrams, Vol. 1, ASM Internationary, USA, 1990, p.17 |
| [4] | 司鹏程,张获,王健,徐明钢,赵愉.材料科学及工程,1997,15(4):15 |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%