The electrochemical reduction of α‐, γ‐, δ‐, and amorphous was investigated. These oxides were applied as pastes to weathering steel substrates and galvanostatically reduced in solutions of . Raman and infrared spectroscopy were used to monitor the reaction products. Amorphous, were reduced to magnetite, , under the experimental conditions of this investigation; however, was not reduced under these conditions. The atmospheric corrosion product formed on a weathering steel light standard was entirely reduced to and had a galvanostatic reduction curve similar to those for .