Corrosion behavior of TiZrHfBeCu(Ni) high-entropy bulk metallic glasses in 3.5 wt. % NaCl

The corrosion behavior of TiZrHfBeCu(Ni) high-entropy bulk metallic glasses (HE-BMGs) has been investigated. The TiZrHfBeCu(Ni) HE-BMGs exhibited high corrosion resistance in 3.5 wt. % NaCl solution because of accumulation of ZrO 2 and TiO 2 in the passive film. Ni promoted increases of the ZrO 2 , TiO 2 , and HfO 2 contents and a decrease of the BeO content, which improved the HE-BMG corrosion behavior. Compared with Zr 41.2 Ti 13.8 Ni 10 Cu 12.5 Be 22.5 BMG, the high-entropy effect of HE-BMGs can significantly reduce the atomic mobility, which inhibits outward migration of Cu, reduces the kinetics of the dissolution reaction, and inhibits inward erosion by Cl − , thereby improving the corrosion performance.