Abstract
Using X-ray photo-electron spectroscopy (XPS), the compositions of the oxides formed at 250°C on carbon steel in 10.5 pH LiOH solution containing 0.05 ppm and 3.5 ppm dissolved oxygen were studied. Magnetite (Fe 3O 4) was found to be bulk oxide in both cases. A layer of γ-Fe 2O 3 was found on the outer surface of the sample exposed to the low oxygen environment, while α-Fe 2O 3 in small amounts, together with bulk Fe 3O 4, was found for the case of the high oxygen environment. Chemisorption of water molecules on the outer surface was observed in both the environments with the additional possibility of formation of FeOOH. Weak signals of Li 1s peak indicated the formation of small amounts of LiFeO 2 in both cases.
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