| 摘要 |
<p>The invention relates to a process for the protection of flat steel rolled sheets previously plated with zinc or zinc containing alloys, comprising:depositing on the surface of the previous plating a layer of chromium metal having a thickness of at least about 0.55 g./m.2 by electrodeposition; and then depositing on the surface of the layer of chromium metal a layer of chromium oxide by electrodeposition, wherein the chromium oxide layer has a thickness of at least about 0.035 g./m.2 and the weight ratio of the chromium metal to the chromium contained in the chromium oxide in the respective deposits is from 25:1 to 4:1. The invention also relates to the product obtained with this process.</p> |
