Abstract
To elucidate the role of anti-corroding alloying metals in weathering steels, the γ-FeOOH and Fe 3O 4 particles were prepared by air-oxidation of FeSO 4 solutions containing different amount of Ti(IV), Cr(III), Cu(II) and Ni(II). The crystallinity and particle size of γ-FeOOH were lowered by adding Cr(III), Cu(II) and Ni(II) but not influenced by Ti(IV). All the metal ions impeded the crystallization and particle growth of Fe 3O 4 in a similar manner. The results on γ-FeOOH and Fe 3O 4 were compared with those on α- and β-FeOOHs previously reported to know the comprehensive effects of metal ions on the formation of rusts.
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