Water molecules effect on pure Ti passive film structure in methanol solution

- Passive film in pure methanol contains TiO2 and Ti2O3, and only TiO2 with water.
- Passive film consists of a thin barrier-type inner layer and a porous outer layer.
- Thinner passive film has better corrosion protection ability.
- Water improves Ti passivation film stability and corrosion protection ability.
- The thickness of the barrier-type inner layer decreases with water contents.