Abstract
In order to obtain well-defined Mössbauer spectra of oxide films on low-carbon steel, it is beneficial to separate the films from the substrate. Chemical stripping in a solution of iodine in methanol in dry and oxygen-free conditions enables the oxide films to be separated without changing their composition and structure. The only by-product is cementite extracted from the low-carbon steel substrate during stripping. The Mössbauer transmission spectra obtained from the stripped oxide films yield information on the phase composition of the films and on deviations from stoichiometry of iron oxides present in the films.
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