The anodic dissolution of Mg in NaCl and Na2SO4 electrolytes by atomic emission spectroelectrochemistry |
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Authors: | Jolanta ?wiatowska |
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Affiliation: | Laboratoire de Physico-Chimie des Surfaces, ENSCP, CNRS (UMR 7045), Chimie-ParisTech, 11 rue Pierre et Marie Curie, 75005 Paris, France |
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Abstract: | The dissolution of Mg has been investigated with atomic emission spectroelectrochemistry at open circuit and during potentiostatic control in chloride (NaCl) and sulfate (Na2SO4) electrolytes. A dissolution stoichiometry of approximately n = 2 is observed under all the conditions of these experiments with no evidence for the commonly invoked Mg+ intermediate. Nevertheless, in chloride electrolyte it is shown that anodic polarization results in a cathodic activation of the surface with increased hydrogen production during the polarization and an increased corrosion rate following the pulse. The formation of insoluble Mg oxides/hydroxides was also investigated in the sulfate electrolyte. |
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Keywords: | A. Magnesium C. Anodic dissolution C. Negative difference effect C. Passivity |
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