THE FORMATION AND PROPERTIES OF PASSIVE FILMS ON IRON
- 1 January 1959
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Chemistry
- Vol. 37 (1), 286-291
- https://doi.org/10.1139/v59-037
Abstract
A unified mechanism for the formation of passive films on iron in aqueous solutions is presented. The effects of water, oxygen, and oxidizing and non-oxidizing ions are considered. The γ-Fe2O3 film is formed first by the oxidation of water-formed magnetite and further thickening of the film takes place by the oxidation of diffusing Fe++ ion at the water surface of the oxide film. The main force leading to diffusion is the field set up by the adsorbed negative ion and the positive Fe++ ions at the surface of the metal. Some of the properties of the protective γ-Fe2O3 film and factors leading to its destruction are discussed.Keywords
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