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Formation of iron oxides by surface oxidation of iron plate (CROSBI ID 176378)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Marciuš, Marijan ; Ristić, Mira ; Musić, Svetozar ; Ivanda, Mile Formation of iron oxides by surface oxidation of iron plate // Croatica chemica acta, 85 (2012), 1; 117-124. doi: 10.5562/cca1943

Podaci o odgovornosti

Marciuš, Marijan ; Ristić, Mira ; Musić, Svetozar ; Ivanda, Mile

engleski

Formation of iron oxides by surface oxidation of iron plate

Oxidation of iron plates (alpha-phase) at high temperatures and in atmospheric conditions was monitored. The composition of oxidation products was analyzed with XRD, Raman and Mössbauer spectroscopies, whereas the morphologies of oxidation products were inspected by FE-SEM. The oxidation products formed at 300 and 400 oC consisted dominantly of magnetite and small fractions of hematite, whereas at 500 and 600 oC hematite was the dominant phase, as shown by XRD. In all these samples Raman spectra showed the presence of hematite in the outer oxidation layer. FE-SEM analysis showed the formation of nanowires at 500 oC and vertically grown hematite spikes against the lower oxidation layers at 600 oC. Oxidation products formed at 800 oC consisted of wüstite, Fe(1-x)O, as the dominant phase, nonstoichiometric magnetite, Fe(3-x)O4, and hematite, alpha-Fe2O3, in small fractions. The surface of these oxidation layers showed a hierarchical microstructure, as well as the hexagonal hematite rods vertically grown against the lower oxidation layers. The formation of the oxidation products can be considered a process which includes the oxidation of alpha-Fe to Fe(1-x)O and its transformation to Fe3-xO4 that further transforms to alpha-Fe2O3, probably via a short-lived alpha-Fe2O3 (maghemite) phase.

iron oxides; corrosion; alpha-Fe; hematite; magnetite; wüstite

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Podaci o izdanju

85 (1)

2012.

117-124

objavljeno

0011-1643

10.5562/cca1943

Povezanost rada

Fizika, Kemija

Poveznice
Indeksiranost