Improving the corrosion resistance of Ti-Zr-Nb alloy in hydrochloric acid environment via varying Zr content

Abstract

In this work, the aim is to develop a corrosion resistant Ti alloy for acidic environments by systematically investigating the influence of Zr content on the microstructure evolution and corrosion behavior of Ti-Zr-Nb alloy. The results indicate that the addition of Zr significantly enhances the passivation ability and corrosion stability of the alloy in hydrochloric acid environments. The Ti₄₅Zr₄₅Nb₁₀ alloy exhibits superior performance with a corrosion potential of -153.07 mV, corrosion current density of 0.11 μA·cm^-2 and corrosion rate of only 0.003 mm·year^-1. Interestingly, under identical corrosion conditions, different specimens displayed distinct interference color variations. These findings offer valuable insights for the design of Ti alloys with improved corrosion resistance, achieved through the optimization of their composition.