抄録
The electrochemically treated steel sheet, which had been plated in CrO3-H2SO4 bath of low concentration, revealed a film composed of two layers. One was foundation layer consisting of metallic chromium, and the other was a surface layer consisting of hydrated chromium oxide. The throwing power of the bath of low concentration was examined in this study.
The results of experiments were as follows.
The throwing power for the hydrated chromium oxided layer was very high, but the power for the metallic chromium layer was of the same grade as that of the same bath of high concentration.
The relation between the throwing power for these film layers and the conditions of plating was studied in detail.
