| 摘要 |
<p>Metallic sheets treated with a resin-chromate, having an excellent corrosion resistance, particularly an excellent corrosion resistance when the treated coating is damaged by working or flawing, and being reduced in the leaching of chromium into an alkaline degreasing solution, a water-soluble rolling oil, dew condensation water, etc. One embodiment of the metallic sheets has thereon a resin-chromate coating composed mainly of a water-dispersible emulsion resin and a chromium compound, and is characterized in that the ratio of the average center face roughness Ra to the average protrusion distance P, Ra/P, as measured by observation of the outermost surface of the resin-chromate coating under an interatomic-force microscope is not more than 0.3 and that the ratio of the average protrusion distance P to the average height H of the resin-chromate coating, i.e., P/H, is 0.01 to 0.5.</p> |
