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Oxidation of Armco-Fe and steels in oxygensaturated liquid lead

2007; Taylor & Francis; Volume: 24; Issue: 2 Linguagem: Inglês

10.3184/096034007x220034

1878-6413

Valentyn Tsisar, Olga Yeliseyeva,

Metallurgical Processes and Thermodynamics

The oxidation behaviour of Armco-Fe, martensitic (0.2C–13Cr), ferritic–martensitic EP–823 (13Cr–2Si) and austenitic stainless (18Cr–10Ni–1Ti) steels in a static lead melt, saturated by oxygen (1.3×10–3 wt% O), at 550°C, for 3000 h was investigated. The features of the oxide layers formation were revealed. Regardless of material a double oxide layer growing symmetrically with regard to the initial interface "solid metalyliquid Pb" towards the melt and matrix was formed. The outer layer for all materials was Fe3O4, while the inner one was composed of Fe3O4 for Armco-Fe, Fe1+xCr2-xO4 for martensitic and ferritic–martensitic steels and of Fe1+xCr2–xO4+Ni for the austenitic steel. Lead did not penetrate into the matrix of tested materials but was detected in the outer columnar part of the scales, except the austenitic steel in which Pb was also observed in the inner part of the scale enriched by Cr and Ni. An oxidation mechanism is proposed.