Abstract
Bulk amorphous Zr55Al10Cu30Ni 5-xPdx (x=0, 5at.%) alloys were produced by copper mould casting. The microstructure of samples was characterized by X-ray diffraction (XRD). The corrosion resistance of the bulk amorphous alloys was studied by potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS). The Pd-free alloy showed an active-passive transition by anodic polarization in 3.5% NaCl solution, it was spontaneously passive and had a wide passive region with significantly low passive current density. The 5% Pd amorphous alloy shows a single active state even with a limited passive region. X-ray photoelectron spectroscopy (XPS) analysis revealed that the spontaneous passive films formed on the alloys after immersion in 0.6 M NaCl solution for 72 h were composed of the oxidation of Zr, Al and Cu element. The Pd-free and 5% Pd alloys show excellent corrosion properties in 1 M NaOH solution.
Original language | English |
---|---|
Pages (from-to) | 1246-1250 |
Number of pages | 5 |
Journal | Materials Letters |
Volume | 58 |
Issue number | 7-8 |
DOIs | |
Publication status | Published - 2004 Mar |
Keywords
- Bulk amorphous alloy
- Corrosion resistance
- Glass-forming ability
- Pitting
- XPS
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering