| 简介 |
PROBLEM TO BE SOLVED : To provide a chemical conversion coating that is substantially free of vivid colors observed in a colored chromate using hexavalent chromium, i.e. colors such as yellow, orange, red and green, without deteriorating other performances of a trivalent chromium chemical conversion coating, a chemical conversion coating treatment liquid, a method for forming the chemical conversion coating, a solution containing rare earth elements used in the method for forming the chemical conversion coating, and a member equipped with the chemical conversion coating.SOLUTION : The chemical conversion coating is formed on a member having a metal surface and is a colorless chemical conversion coating that contains trivalent chromium and ≥0.0010 g/mrare earth elements, has a thickness of 50-1, 000 nm and is free of hexavalent chromium. |
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