Tuning microstructure and improving the corrosion resistance of a Ti-6Al-3Nb-2Zr-1Mo alloy via solution and aging treatments

Herein, the influences of solution-aging treatments on the corrosion behaviors of a wrought Ti-6Al-3Nb-2Zr-1Mo alloy are investigated. The solution-aging treated alloys exhibit a better corrosion performance than the wrought alloy, stemming from the alleviated galvanic corrosion. In artificial seawater, all alloys display a spontaneous passivation behavior, and the oxygen reduction reaction (ORR), affected by diffusion and charge-transfer pro-cesses, performs as the prominent cathodic reaction. However, in 5 M HCl, the activation-passivation transition occurs, and the cathodic reaction is mainly related to the hydrogen evolution reaction (HER) controlled by the Volmer reaction. Furthermore, we illustrate the relevant ORR and HER mechanisms.

Automated summary

The influences of solution-aging treatments on the corrosion behaviors of a wrought Ti-6Al-3Nb-2Zr-1Mo alloy were investigated. The solution-aging treated alloys exhibited better corrosion performance than the wrought alloy due to the alleviated galvanic corrosion. In artificial seawater, all alloys displayed spontaneous passivation behavior, while in 5 M HCl, an activation-passivation transition occurred.