Crystallization and Corrosion Resistance in Different Aqueous Solutions of Zr50.7Ni28Cu9Al12.3 Amorphous Alloy and Its Crystallization Counterparts

The Zr 50.7 Ni 28 Cu 9 Al 12.3 amorphous alloy and its crystallization counterparts have been prepared using a melt spinning technique and proper annealing treatment. The as-annealed products at 768 K are amorphous composites consisting of a main amorphous phase and a few ZrO 2 nanocrystals. The corrosion behaviors have been investigated in 0.5-M NaCl, 1-M HCl, and 0.5-M H 2 SO 4 solutions. The results show that amorphous composites present the enhanced corrosion resistance in Cl − containing solutions due to the formation of compact passive films, which are promoted by an appropriate quantity of ZrO 2 nanocrystals. Nevertheless, the relaxed samples possess good corrosion resistance in H 2 SO 4 solution, which is attributed to the existence of Zr(Al, Ni)-rich protective film induced by the depletion of Cu. In addition, corrosion resistance of the tested alloys is relatively superior in H 2 SO 4 solution, especially for pitting corrosion resistance, and inferior in HCl solution.