Corrosion and passivation behavior of laser powder bed fusion produced Ti-6Al-4V in static/dynamic NaCl solutions with different concentrations

In this work, the corrosion and passivation behavior of Ti-6Al-4V produced by laser powder bed fusion (L-PBF) were investigated in different concentration of NaCl solutions under static and dynamic conditions. Oxide films including TiO2, Ti2O3, TiO were formed on L-PBF-produced Ti-6Al-4V. The film thickness increased under both test conditions with increasing the Cl- concentration, and the film contained more TiO2 in dynamic conditions under the same Cl- concentration. The mechanism of the corrosion behavior and film growth under different Cl- concentration and electrolyte conditions were discussed by the relevant electrochemical and surface characteristic measurements, e.g. Mott-Schottky analysis, X-ray photoelectron spectroscopy.

Automated summary

The study found that Ti-6Al-4V forms oxide films in NaCl solutions, with film thickness increasing with Cl- concentration, and more TiO2 content in dynamic conditions. The corrosion behavior and film growth mechanisms were discussed based on electrochemical and surface characteristic measurements.