Abstract
Abstract Oxide film formation on the surface of carbon steels during contact with solutions of reagents such as oxygen, hydrogen peroxide (H2O2), hydrazine-hydrate (N2H4·H2O), ammonium acetate (CH3COONH4), and ethylene-diamin-tetraacetate (Na2H2Y2) was studied. By means of a number of physical and chemical methods (radioactive indicators, spectrophotometry, gel-chromatography, and Mossbauer spectroscopy, etc.), it has been proven that iron compounds in the solution contacting the steel surface play the decisive role in the formation of oxide films. Oxide films on steels with maximal protective properties are shown to form in water solutions of Fe(III) complexes or solutions containing polymer forms of its hydrolysis products with the number of iron atoms in the molecule being <13.
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