Evolution and corrosion resistance of passive film with polarization potential on Ti-5Al-5Mo-5V-1Fe-1Cr alloy in simulated marine environments

Evolution and corrosion resistance of passive film with anodic polarization potentials on Ti-5Al-5Mo-5 V-1Fe-1Cr alloy in a 3.5 wt% NaCl solution were investigated. The valence state of Ti element increased, while the passive film corrosion resistance exhibited an evolution trend from weak to strong and then to weak with increasing polarization potential. Adsorption energy calculations of Cl- indicated a stable adsorption of Cl- on the TiO2. Combined with the corrosion effect of corrosive ions on metal hydroxides, the passive film compactness would decrease and the roughness would increase, triggering a decrease in the passive film corrosion resistance as potential increased.

Automated summary

The evolution and corrosion resistance of the passive film on a Ti-5Al-5Mo-5V-1Fe-1Cr alloy were studied under different anodic polarization potentials in a 3.5 wt% NaCl solution. The valence state of Ti increased, while the corrosion resistance of the passive film exhibited a trend of weak to strong to weak as the polarization potential increased. Adsorption energy calculations revealed stable adsorption of Cl- on TiO2. The decrease in passive film corrosion resistance with increasing potential was attributed to the corrosion effect of corrosive ions on metal hydroxides.