Abstract

The corrosion-electrochemical properties of α-Fe + Fe3C + TiC three-phase nanocrystalline composites in borate solutions with pH 6.3–9.0 both with and without NaCl are studied. α-Fe + Fe3C + TiC composites are found to have heightened resistances at active-oxidation potentials of α-Fe and cementite due to the formation of xFeO · yTiO2 mixed surface oxides. The protective properties of passive films based on xFeO · yTiO2 and their resistance to local activation are worse than those of Fe3O4/γ-Fe2O3 (γ-FeOOH) passive films formed on iron and α-Fe + Fe3C composites.

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