Abstract
The effects of polarization characteristics on current efficiency of chromium plating bath were studied and the following results were obtained:1) In the solution containing fluorides, the electrode reaction for electrodeposition of metallic chromium plating was retarded, and the intermediate products in cathodic reduction such as black chromium plating were likely to be deposited so that the increase of current efficiency was inhibited.2) In the solution containing fluorides, the electrode reaction for electrodeposition of metallic chromium plating was more detarded with the drop of the bath temperature, and the deposition of intermediate products in cathodic reduction was likely to be promoted so that the increase of current efficiency was inhibited.3) In the solution containing sulfuric acid, the current efficiency was greatly increased with the drop of the bath temperature.4) In the solution containing the mixture of sulfuric acid and fluorides, the current efficiency of the mixed solution was likely to make a compromise between the both efficiencies of each of solutions containing sulfuric acid and fluorides, respectively.
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