A. V. Kuzin, A. V. Lobanov, V. A. Shelonzev, E. A. Eliseeva, A. S. Samadov
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Abstract
The kinetics of dissolution and the electrochemical features of the behavior of magnetite (in cathodic polarization) in solutions of sulfuric and orthophosphoric acids are studied. Two independent experimental methods establish that the rate and current of dissolution in H3PO4 are higher than in H2SO4. This pattern is explained based on the stronger complexing properties of various kinds of phosphate anions in comparison with sulfate anions in solution with iron(III) ions. In the range of studied concentrations of orthophosphoric and sulfuric acids, as well as Fe(II) and Fe(III) ions, the reaction orders for orthophosphoric and sulfuric acids are 1.3 ± 0.1; for iron(II) ions, 0.25 ± 0.1; and for iron(III) ions, –0.25 ± 0.1.
期刊介绍：
Russian Journal of Physical Chemistry B: Focus on Physics is a journal that publishes studies in the following areas: elementary physical and chemical processes; structure of chemical compounds, reactivity, effect of external field and environment on chemical transformations; molecular dynamics and molecular organization; dynamics and kinetics of photoand radiation-induced processes; mechanism of chemical reactions in gas and condensed phases and at interfaces; chain and thermal processes of ignition, combustion and detonation in gases, two-phase and condensed systems; shock waves; new physical methods of examining chemical reactions; and biological processes in chemical physics.
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