Abstract
Anodic behavior of iron in chloride solutions is studied in the pH range from 0 to 6 and at the concentration of chloride ions from 0.2 to 3 mol/l. Electrochemical measurements were supplemented with the raster electron microscopy studies, of electrode surfaces. The observed independence of the limiting dissolution current of pH is explained by a hypothesis that water does not participate in the anodic process at sufficiently large anodic overpotentials. Depending on the concentration of chloride ions, the continuity of the logi a-pH dependence is first interrupted and the, restored; the reaction order in hydroxide ions changes from a positive value to zero. This is probably caused by the “dynamic passivation” of iron with the adsorbed oxygen atoms and their competitive replacement by chloride ions.
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Pletnev, M.A., Morozov, S.G. & Alekseev, V.P. Peculiar effect of chloride ions on the anodic dissolution of iron in solutions of various acidity. Prot Met 36, 202–208 (2000). https://doi.org/10.1007/BF02758391
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DOI: https://doi.org/10.1007/BF02758391