Abstract
The acidity of a chromium-plating electrolyte based on chromic sulfate may be stabilized in a two-chamber electrolyzer with an anion-exchange membrane (AEM). The optimum concentration of sulfuric acid in the anolyte (c sa) may be selected on the basis of the material balance equation for the catholyte, which allows for the dependence of the transport number of hydronium ions in AEM on c sa. No considerable accumulation of Cr2+ occurs in the catholyte during a prolonged electrolysis. The transport of formate ions through AEM at working values of electrolyte pH is inconsiderable.
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