The corrosion resistances of the Fe-Ti alloys fabricated by an ion-beam sputter and an arc-melting process were examined in acid solutions. XPS analysis has been used to compare the passive films formed on the alloys. The sputtered Fe-Ti alloys have an amorphous structure while the arc-melted Fe-Ti alloys have a crystalline with a dendritic structure. The corrosion rate of the sputtered Fe-Ti alloys in 3 M HCl decreased with increasing the titanium fraction in the alloys. For the arc-melted Fe-Ti alloys which contain more than 57 at% Ti, the corrosion rate decreases with increasing the titanium fraction in the alloys. However, the corrosion rate of the sputtered Fe-Ti alloys is about ten times lower than that of the arc-melted alloys. The sputtered Fe-Ti alloys passivate anodically in 1 M H₂SO₄, and HCl, and exhibit higher corrosion resistance since the passive films formed on the alloys contain high chemical resistant oxides.