| 简介 |
PROBLEM TO BE SOLVED : To provide a black chemical conversion coating that is capable of improving blackness without deteriorating corrosion resistance, a black chemical conversion coating treatment liquid, a method for forming the black 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 black chemical conversion coating.SOLUTION : The black chemical conversion coating is formed on a member having a metal surface. The black chemical conversion coating contains trivalent chromium and ≥0.0010 g/mrare earth elements, has a thickness of 100-1, 500 nm and is free of hexavalent chromium. |
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