Abstract: Samples of (Ti_0.5Ni_0.5－xZr_x)₈₀Cu₂₀ bulk metallic glass with x=0, 0.02, 0.04 and 0.06 were prepared with method of magneto-suspension melting plus absorptive casting in water-cooling crucible and negative-pressure copper mold. The phase-composition of the alloy samples was analyzed, and the polarization curves of the samples in artificial sea-water and simulated human PBS solution were tested. The morphology of electrochemical corrosion was observed and the electrochemical corrosion productwas precipitated and characterized. The result show that the microstructure of the alloy would be composed of amorphous matrix plus crystal phase B2-Ti (Ni, Cu) austenite phase and B19’-Ti (Ni, Cu) martensite phase. It would be gotten that compared with the crystalline TC4 alloy, several alloys would have better corrosion resistance in both artificial sea-water solution and PBS solution, and the corrosion resistance of the alloy would increase with the Zr content. When x=0.06, the alloy would exhibit the most excellent corrosion resistance, its self-corrosion potential was so high as －0.218 V, thermodynamic tendency was so feeble that hard to be corroded, self-corrosion current density was lower as 0.912 μA·cm^－2, polarization resistance was large as 3.4 MΩ·cm² and corrosion kinetic rate was low, and the alloy would have more excellent corrosion resistance in PBS solution and would be no obvious dotted corrosion pit to be found in the corrosion morphology.

Key words: amorphous composite, microstructure, corrosion behavior