The influence of chloride ions on the kinetics of iron dissolution |
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| Authors: | NA Darwish F Hilbert WJ Lorenz H Rosswag |
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| Affiliation: | Institute of Inorganic Technology and Analytical Chemistry, Technical University, Graz/Austria;Institute of Physical Chemistry and Electrochemistry, University Karlsruhe/Germany |
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| Abstract: | The anodic dissolution of pure iron was studied in oxygen-free solutions at high concentrations of chloride and hydrogen ions at 25°C under potentiostatic steady-state conditions. In the range cH+ ? 1 M the following kinetic data were obtained: Tafel slope b+ ? +100 mV, electrochemical reaction order related to CH+, n+.H+ = +1·1, and electrochemical reaction order related to the chloride ion concentration, n+,Cl? = +0·6. These values cannot be correlated to the currently proposed mechanisms of iron dissolution, another mechanism is suggested for the described conditions. The correlations to known mechanisms are discussed. |
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