The electrochemical reduction of α‐, γ‐, δ‐, and amorphous normalFeOOH was investigated. These oxides were applied as pastes to weathering steel substrates and galvanostatically reduced in solutions of 0.1MNa2SO4 . Raman and infrared spectroscopy were used to monitor the reaction products. Amorphous, γ‐,normaland δ‐normalFeOOH were reduced to magnetite, Fe3O4 , under the experimental conditions of this investigation; however, α‐normalFeOOH was not reduced under these conditions. The atmospheric corrosion product formed on a weathering steel light standard was entirely reduced to Fe3O4 and had a galvanostatic reduction curve similar to those for γ‐,normaland δ‐normalFeOOH .

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