摘要:
The effects of microstructure change on the corrosion behaviours of Ni
55Nb
20Ti
10Zr
8Co
7 bulk glass-forming alloy were investigated in 1 mol/L HCl and 0.5 mol/L H
2SO
4 solutions. Different microstructures of the Ni-based alloy were achieved by annealing the bulk glassy rod prepared by copper mould casting. The microstructure, grain size, grain distribution, and phase composition were characterized. Electrochemical behaviours of the Ni-based alloy were revealed by static immersion and anodic potentiodynamic polarization tests. It is indicated that the corrosion behaviours of the Ni-based bulk glass-forming alloy are related to its microstructures, while the fully crystallized alloy exhibits a relatively lower corrosion resistance than those of the amorphous states.