Abstract
Polarization characteristics of the solution of chromic acid were examined by current-time curves determined by potentiostatic method. The following results were obtained:
1) The electrodeposition of black chromium plating gradually proceeded in the aqueous solution of single chromic acid, but the deposition was remarkably promoted by addition of a small amount of fluorides.
2) In the solution containing fluorides, the tendency to deposit black chromium plating was greater with the drop of the bath temperature and that to deposit metallic chromium plating was greater with the rise of the bath temperature.
3) In the solution containing sulfuric acid, the electrode reaction for electrodeposition of chromium was more promoted with the drop of the bath temperature.
