Alloying effects on the corrosion behavior of binary Nb-based and Do-based alloys in liquid Li

摘要

Alloying effects on the corrosion in liquid Li at 1473 K have been investigated for both binary Nb-based and Do-based alloys. For the binary Nb-based alloys, the weight change due to the corrosion varied largely with alloying elements. Also, there was a clear difference in the surface morphology between them after corrosion tests. Either one or two corrosion products and large cracks were observed on the surface of all the Nb-based alloys. The weight change of a Nb-Hf alloy was the smallest among a variety of Nb-based alloys, indicating that the Hf addition was very effective in improving the corrosion resistance. On the other hand, for the binary Do-based alloys the weight change was about a factor of 10 smaller than that for the binary Nb-based alloys. There were no cracks and a little corrosion products on the surface of them, indicating that the Do-based alloys have much superior corrosion resistance in liquid Li than the Nb-based alloys.