Effects of Additional Elements on the Glass Formation and Corrosion Behavior of Bulk Glassy Cu-Hf-Ti Alloys

Abstract

New bulk glassy (Cu 0.6 Hf 0.25 Ti 0.15 ) 98 M 2 (M = Mo, Ta and Nb) alloys with high thermal stability were synthesized and the effects of additional elements Mo, Ta and Nb on the glass formation and corrosion behavior were examined. The maximum diameter for glass formation of the 2 at%Mo, 2 at%Ta and 2 at%Nb alloys was 1.5 mm, 3.5 mm and 4.0 mm, respectively. The corrosion behavior of the Cu-Hf-Ti-(Mo, Ta and Nb) glassy alloys was examined by weight loss and electrochemical measurements. By substitution of 2 at%Mo, Ta or Nb for the Cu 60 Hf 25 Ti 15 alloy, the corrosion rates of the alloys decreased to 1/2 in 1 N HCl and two orders of magnitude in 3% NaCl solution. It was also found that substitution of elements Mo, Ta and Nb for the Cu 60 Hf 25 Ti 15 glassy alloy was effective on decreasing anodic passive current density in 3% NaCI solution.