抄録
The properties of the cathodic film obtained from aqueous solution of single chromic acid and that solution containing sulfuric acid or acetic acid were studied, and the following results were obtained.
(1) The appearances of the cathodic films obtained from aqueous solution of single chromic acid and that solution containing acetic acid were much different according to the conditions of electrolysis.
(2) The burning of the film obtained from that solution containing sulfuric acid depended upon the temperature of the bath. At lower temperatures, it consisted of fine particles and at higher temperatures, it was a mere convexity.
(3) Diffracted ray was not observed by X-ray diffractiometry from bright chromium plating film; otherwise, the intensity of the ray was very weak showing the incomplete development of crystals.
(4) The descending order of the intensities of diffracted rays through the platings obtained from each of the above 3 kinds of baths under the current density of higher than 200Amp/dm2 was arranged as follows: [110]>[200]>[211]
