The Role of the Anion in the Anodic Dissolution of Magnesium

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Abstract
In a number of aqueous environments the increase in the corrosion rate of magnesium with an increase in impressed anodic current (i) is expressed by where is the transport number of the anions of the electrolyte. This adds confirmation to the viewpoint that film damage by anions rather than metal spalling or the production of monovalent magnesium ions is the chief contributor to the current inefficiency observed with magnesium anodes. The same equation holds for the decrease in corrosion rate of magnesium with applied cathodic current in acids, indicating that anion supply to the metal surface is controlling that process, also.

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