Corrosion behavior of Ti-based bulk amorphous alloys in acidic solutions
(1. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China;
2. School of Science, Yanshan University, Qinhuangdao 066004, China)
2. School of Science, Yanshan University, Qinhuangdao 066004, China)
Abstract: The corrosion behavior of the Ti34.3Zr31.5Cu5Ni5.5Be23.7 bulk amorphous alloy was investigated in different concentrations of the HCl and H2SO4 solutions. Electrochemical testing and scanning electron microscopy analysis indicate that Cl- ions can cause pitting damage in the HCl solution during the polarization process, and the pitting potential decreases with increasing solution concentration. The degree of damage to the corroded surface is positively correlated with the solution concentration. A passive film forms in the H2SO4 solution, indicating good corrosion resistance. X-ray photoelectron spectroscopy shows that the stability of the passivated film decreases with increasing HCl solution concentration. The corrosion rates of the four materials were obtained by an immersion experiment in HCl solution. The results reveal that Ti34.3Zr31.5Cu5Ni5.5Be23.7 bulk amorphous alloy has the best corrosion resistance, with a corrosion rate of 7.22×10-3 mm/a, which is approximately 1/1294 that of 316L stainless steel.
Key words: Ti-based bulk amorphous alloy; acidic solution; passive film; corrosion behavior; corrosion rate