Mg-39 Bi-17 Sn alloy was selected as the heat storage material

and 45 steel

201 and 316 L stainless steel were used for the container materials. By constant temperature full immersion corrosion testing

the corrosion behavior and mechanism of three steels in Mg-Bi-Sn alloy liquid were investigated with the aid of metallographic microscope

XRD analyzer and electron probe（EPMA） combined with corrosion kinetics analysis. The results reveal that the corrosion rates of 45 steel

201 and 316 L stainless steel reach 0.559

0.557 and 0.072 g/（m

2

·h） after 840 h corrosion

respectively. There exists obvious corrosion layer at the boundary of 45 steel

and the thickness is about 10～15 μm. The corrosion layer consists of Fe

3

O

4

and Fe. There is absence of obvious corrosion layer at the edges of 201 and 316 L stainless steel. The 45 steel contain the free of Ni or Cr

so it is difficult to prevent the corrosion of O element in the molten metal. In the 201 stainless steel

the Ni content is low

so it is difficult to fully exert the corrosion resistance of Cr element. The Mo element in 316 L and Cr has synergistic effect

further strengthening the corrosion resistance of 316 L stainless steel.