TRIVALENT CHROMIUM CHEMICAL CONVERSION TREATMENT SOLUTION PARTICULARLY SUITABLE FOR ZINC-NICKEL ALLOY PLATING AND TIN-ZINC ALLOY PLATING

PROBLEM TO BE SOLVED: To provide a chemical conversion treatment solution for forming a trivalent chromium chemical conversion coating suitable for zinc and zinc-based alloy plating, particularly suitable for zinc-nickel alloy plating and tin-zinc alloy plating.SOLUTION: The chemical conversion coat...

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Bibliographische Detailangaben
Hauptverfasser:	MAKINO TOSHIAKI, BANDO SATOSHI, KOIKE KATSUHIRO
Format:	Patent
Sprache:	eng
Schlagworte:	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
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a chemical conversion treatment solution for forming a trivalent chromium chemical conversion coating suitable for zinc and zinc-based alloy plating, particularly suitable for zinc-nickel alloy plating and tin-zinc alloy plating.SOLUTION: The chemical conversion coating treatment solution for zinc or zinc-based alloy plating contains (A) trivalent chromium, (B) two or more of carboxylic acid or derivatives thereof, and (C) one or more selected from chloride ions, oxyacid ions of chlorine, sulfate ions and nitrate ions. The total number of carboxyl groups of carboxylic acid contained in the (B) group is 3 or more, and the difference of pKa from the carbonyl group with smallest pKa is 1.2 or more. The other carboxyl groups are in different kinds of molecules from a molecule with the carboxyl group with the smallest pKa, and have the smallest pKa in the molecules.