SURFACE TREATMENT AGENT, SURFACE TREATMENT METHOD, AND SURFACE-TREATED CARBON STEEL

PROBLEM TO BE SOLVED: To provide a surface treatment agent containing no phosphor, and to provide a surface treatment method using the surface treatment agent containing no phosphor. SOLUTION: The surface treatment agent is formed of an aqueous solution which contains one or more organic chelating a...

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Hauptverfasser:	SAKANISHI AKIHIRO, SAO TOSHIO, YOSHIYAMA TAKASHI, FUKUOKA SHIGENORI, UEDA ATSUNARI
Format:	Patent
Sprache:	eng
Schlagworte:	AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL 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 MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY PERFORMING OPERATIONS PUNCHING METAL SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TRANSPORTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a surface treatment agent containing no phosphor, and to provide a surface treatment method using the surface treatment agent containing no phosphor. SOLUTION: The surface treatment agent is formed of an aqueous solution which contains one or more organic chelating agents selected from aminocarboxylic acids and aminocarboxylates, and in which the concentration of the organic chelating agents is adjusted to 1 g/L to 300 g/L, and the pH is 4.0 to 9.0. The surface treatment method includes the steps of: immersing carbon steel into a treatment liquid in which Fe2+is added to the surface treatment agent formed of the aqueous solution that contains one or more organic chelating agents selected from the aminocarboxylic acids and the aminocarboxylates; and adjusting the pH of the treatment liquid, the concentration of the organic chelating agent in the treatment liquid, the concentration of Fe2+in the treatment liquid, the concentration of Fe3+in the treatment liquid, and the oxidation-reduction potential of the treatment liquid. COPYRIGHT: (C)2009,JPO&INPIT