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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。
The corrosion behavior of pure aluminum, Al-Si and Al-Mg alloys in molten sodium at 350-450 ℃ was studied. The morphology of the corrosion products and the distribution of alloying elements were analyzed by OM, XRD, EDAX and EPMA. Experimental results show that high purity aluminum is slightly etched, not completely “free from corrosion”. The corrosion of industrial pure aluminum is more obvious, mainly occurs in the vicinity of grain boundaries where impurities are segregated. The degree of corrosion of the aluminum alloy depends on the content of impurity elements, especially silicon. Adding a certain amount of magnesium to aluminum and refining the grains with trace amounts of zirconium can improve the corrosion resistance of the alloy to molten sodium. The corrosion products of aluminum and aluminum alloys were determined to be AINaSi phases.