Corrosion behavior and mechanical properties of Vit1 metallic glasses prepared at different cooling rates

The cooling rate during the preparation of the amorphous alloy has a great influence on the microstructure of the amorphous alloy, and the microstructure further affects the corrosion performance. But, the change of the corrosion properties of amorphous alloys and the mechanical properties after corrosion due to dif-ferent cooling rates caused by different molds are not clear at present. In this paper, by changing the mold material, the cooling rate of the Vit1 (Zr41.2Ti13.8Cu12.5Ni10Be22.5) amorphous alloy was controlled during solidification. Accordingly, the Vit1 amorphous alloy was prepared with copper, graphite, and steel molds. The effect of cooling rate on the corrosion behavior and mechanical properties before and after corrosion in 0.05 mol/L H2SO4, 0.1 mol/L HCl, and 6 mol/L NaCl solutions was investigated. The results showed that the amorphous alloy prepared by graphite mold could form a relatively stable passivation film in the H2SO4 solution. However, the amorphous alloy prepared by graphite mold required a higher potential when forming passivation film. Similar corrosion characteristics occurred in HCl and NaCl solutions; different degrees of pitting corrosion were observed. The analysis of mechanical properties demonstrated that the tensile properties of Vit1 amorphous alloy prepared at different cooling rates were closely related to its corrosion behavior. The tensile properties reduced about 0.02%0- 0.04%0 before and after corrosion in the H2SO4 solution due to the formation of a stable and dense passivation film. In HCl and NaCl corrosive solutions, pitting deteriorated the tensile mechanical properties. the mechanical properties of Vit1 amor-phous alloy prepared by graphite mold had the least deterioration (about 0.47%0).(c) 2022 Elsevier B.V. All rights reserved.