Corrosion and oxidation behavior of amorphous and nanoquasicrystalline phases in Zr70Pd30 and Zr80Pt20 alloys

The corrosion behavior of melt-spun amorphous and nanoquasicrystalline Zr 80 Pt 20 ribbons and amorphous Zr 70 Pd 30 ribbons has been investigated using a potentiodynamic polarization study in a neutral NaCl solution. All three alloys are susceptible to chloride attack, and pitting is observed. The pitting corrosion behavior of these alloys has been compared with zirconium (98% pure). The oxidation behavior of the amorphous Zr 70 Pd 30 alloy and the partially nanocrystalline Zr 80 Pt 20 alloys has been studied non-isothermally by a thermo-gravimetric analysis in static air at different heating rates up to 773 K. It was observed that the amorphous Zr 70 Pd 30 alloy readily oxidizes. Zr 80 Pt 20 alloys in the nanoquasicrystalline state are more resistant to oxidation.