The corrosion behaviors of Zr

56

Cu

19

Ni

11

Al)9Nb)5 metallic glass in 3.5% NaCl

1 mol/L NaOH and 1 mol/L H

2

SO

4

solutions were analyzed by immersion test

potentiodynamic polarization test

scanning electron microscopy（SEM）

energy dispersive X-ray spectroscopy（EDX）and X-ray photoelectron spectroscopy.Immersion tests reveal that when the samples are immersed in 3.5% NaCl

1 mol/L NaOH and 1 mol/L H

2

SO

4

solutions for2 256 h

absence of obvious corrosion can be observed by naked eyes.SEM results show that the localized corrosion behavior occurs in the samples

where the corrosion resistance is presented as follows:the worst in 3.5%NaCl solution

the middle in 1 mol/L NaOH solution

and the best in 1 mol/L H

2

SO

4

solution.Potentiodynamic polarization tests indicate that absence of passivation occurs in 3.5% NaCl solution

and passivation film is dissolved locally due to the attack of Cl

-

.The corrosion current density reaches the highest value in 3.5% NaCl solution

indicating the worst corrosion resistance.Passivation with the formation of dense and stable passivation film occurs in 1 mol/L NaOH and 1 mol/L H

2

SO

4

solutions.In 1 mol/L H

2

SO

4

solution

the spontaneous corrosion potential and the pitting potential reach higher values desirable effect

and the corrosion current density is the smaller with the wider passivation region

so more stable passivation film provides better protection

indicating better corrosion resistance.EDX and XPS analysis shows that in 3.5% NaCl

1 mol/L NaOH and 1 mol/L H

2

SO

4

solutions

the corrosion products are mainly composed of ZrO

2

Cu

2

O

Al

2

O

3

NiO and Nb

2

O

5

.