Effect of tension on corrosive and thermal properties of Cu60Zr30Ti10 metallic glass

Cu60Zr30Ti10 (at.%) glassy ribbon was prepared by melt spinning. The effect of the tension on its thermal and corrosive properties was investigated by differential scanning calorimetry and electrochemical polarization experiments, respectively. The glass transition temperature T-g, onset crystallization temperature T-x, and crystallization peak temperature T-p increase with increasing heating rate, but the increasing rate of these temperatures is larger for low heating rate (5-20 K min(-1)) than for rapid heating rate (20-80 K min(-1)) for the as-cast and tensile ribbons. The T-g for the tensile ribbon is smaller than that for the as-cast one in studied heating rates. The T-x and the T-p for the tensile ribbon are smaller than those for the a-cast ribbon when the heating rate is less than 80 K min(-1), while inversely when the heating rate reaches up to 80 K min(-1). There is a critical heating rate for the characteristic temperatures of the tensile ribbon surpassing those of the as-cast one. The heating rates are estimated to be 114.7 K min(-1) for T-g, 65.3 K min(-1) for T-x, and 64.9 K min(-1) for T-p, respectively. In addition, the activation energies for the glass transition and the crystallization decrease. On the other hand, the corrosion potential is larger in 0.5 M H2SO4 than in 1 M chloride-ion-containing solutions for the as-cast and tensile specimens. However, the corrosion current density is smaller in the former than in the latter for the tensile and as-cast specimens. After the tension, the corrosion potential sharply increases in 0.5 M H2SO4 and decreases in 1 M chloride-ion-containing solutions. The passive potential decreases and the pitting corrosion can be observed in 0.5 M H2SO4. The potential for the sharp decrease of the current density decreases in 1 M HCl, and maintains almost the same in 1 M NaCl. The corroded surface micrographs in all studied solutions are remarkably changed. In addition, the difference of corrosive behavior in 0.5 M H2SO4, 1 M HCl, and 1 M NaCl is also discussed. (C) 2013 Elsevier B.V. All rights reserved.