Effect of Cu content on the corrosion behavior of Ti-based bulk amorphous alloys in HCl solution

Abstract

In this study, the effect of Cu content on the corrosion behavior of (Ti36.1Zr33.2Ni5.8Be24.9)100−xCux (x = 5, 7, and 9 at.%) amorphous alloys in an HCl solution was systematically investigated. The results demonstrate that three materials exhibited pitting corrosion in the HCl solution. The stability of the passivation film suffered with an increase in Cu content and the corresponding decrease of the TiO2 content, thus decreasing the pitting potential. Furthermore, the increase in Cu content enhanced the adsorption of Cl− ions on the alloys surface, producing additional sites for pitting. Thus, the number of corrosion pits and the corrosion rate increased. The corrosion resistance of the amorphous alloy was optimal at x = 5.