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Effect of Chloride Ions on the Rate of Iron Dissolution in Weakly Acid Sulfate Solution |
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20.09.2008 г. |
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Effect of Chloride Ions on the Rate of Iron Dissolution in Weakly Acid Sulfate Solution A. N. Podobaev State scientific center of the Russian Federation “Karpov Institute of Physical Chemistry,”
ul. Vorontsovo Pole 10, Moscow, 103064 Russia e-mail:
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Received November 23, 2004 Abstract — In acid (pH 0 or lower) and weakly acid (pH 1.72) sulfate solutions, chloride ions either decelerate or accelerate iron dissolution, depending on whether the chloride concentration is low or high, respectively. The acceleration effect in a weakly acid solution occurs at a chloride concentration approximately two orders lower than in acid solution. The difference is due to an increase in the surface concentration of chemisorbed water molecules with an increase in the solution pH. The deceleration is mainly caused by the chloride-ion adsorption at the metal; the acceleration, by its incorporation into metal–water surface complexes.
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