CHEMICAL CONVERSION COATING, CHEMICAL CONVERSION COATING TREATMENT LIQUID, METHOD FOR FORMING THE CHEMICAL CONVERSION COATING, SOLUTION CONTAINING RARE EARTH ELEMENT USED IN THE METHOD FOR FORMING THE CHEMICAL CONVERSION COATING AND MEMBER EQUIPPED WITH THE CHEMICAL CONVERSION COATING

• Main Authors: OKAMOTO IE, MASUDA ASAMI, MAKINO TOSHIAKI, HORIE HIDEKAZU
• Format: Patent
• Language: English
• Published: 28.06.2012
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

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.