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In order to elucidate the mechanism for the protective ability of final stable rust layer formed on a weathering steel by atmospheric corrosion, the ion selective property of rust layer was studied by the use of synthetic iron rust membranes. Anion selective property was increased in this order: Fe3O4<ƒ¿-Fe2O3<ƒ¿-FeOOH<ƒÁ-FeOOH<ƒÀ-FeOOH. Fe3O4 has little effect on the ion selective property. Anion selective property decreased with increasing Cr content in a(Fe1-x, Crx) OOH (Cr-substituted goethite), cation selective property came out when the Cr content exceeds 3.8 mass %. As the effect of adsorbed oxyanions, all of PO43-, MoO42and SO42reduced the anion selective property or changed to cation selective property. Among these anions, PO43has significant effect on the ion selective

Ion Selective Properties of Rust Membranes and Protective Effect of Stable Rust Layer Formed on Weathering Steel