1. College of Mechanical Engineering, Liaoning Petrochemical University,Fushun 113001, China
2. China Petrochemical Catalyst Co., Ltd., Beijing 100029, China
et al.
Ni50Nb14Ta14P9Fe13 amorphous ribbons were prepared by arc melting combined with vacuum strip spinning. The microstructure of the alloy was analyzed by XRD, SEM and XPS, and the effects of annealing on the corrosion resistance properties of Ni50Nb14Ta14P9Fe13 amorphous alloy were studied by differential scanning calorimetry (DSC), potentiodynamic polarization (PD) curves, and electrochemical impedance spectroscopy (EIS). The results indicate that the as-cast alloy has a typical amorphous structure. After annealing at 1133 and 1213 K for 5 min, the alloy undergoes crystallization, and the degree of crystallization increases with temperature, with a grain size range of 10~32 nm. In a 32wt% HCl solution at 65 ℃, the corrosion resistance property of the as-cast alloy is significantly better than that of the partially crystallized sample (1133 K) and the fully crystallized sample (1213 K), with a self-corrosion current density of 53.9 μA/cm2, which is about 25.6% and 14.4% of the respective value of the partially crystallized and fully crystallized samples. The passivation current density is 1.3 mA/cm2, which is approximately 33.3% and 2.9% of the respective value of the partially crystallized and fully crystallized samples. The capacitance arc radius significantly decreases after crystallization. The as-cast alloy has the lowest corrosion rate and the best corrosion resistance. Its corrosion rate is the highest and its corrosion resistance is the worst after complete crystallization. This study reveals the negative impact of crystallization on the corrosion behavior of the Ni-based amorphous alloy.