Fe/Zr multilayer films were synthesized by sputter deposition. Modulation wavelengths (Λ) were varied from 0.8 to 92 nm. Their structure and corrosion properties depend on Λ. The samples with Λ = 4 nm, in which a crystalline to amorphous transition was exhibited, appeared to be the most corrosion resistant. This behavior is discussed in connection with the multilayer structure.