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Protection of Metals

, Volume 36, Issue 3, pp 202–208 | Cite as

Peculiar effect of chloride ions on the anodic dissolution of iron in solutions of various acidity

  • M. A. Pletnev
  • S. G. Morozov
  • V. P. Alekseev
Article

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.

Keywords

Anodic Dissolution Anodic Potential Anodic Process Anodic Reaction Iron Surface 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© MAIK “Nauka/Interperiodica” 2000

Authors and Affiliations

  • M. A. Pletnev
    • 1
  • S. G. Morozov
    • 1
  • V. P. Alekseev
    • 1
  1. 1.Udmurtiya State UniversityIzhevskRussia

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