METAL SURFACE TREATMENT LIQUID, SURFACE TREATMENT METHOD FOR METAL BASES, AND METAL BASE OBTAINED BY SURFACE TREATMENT METHOD FOR METAL BASES

• Main Authors: TSUNEISHI, AKINOBU, KAWAGOSHI, RYOSUKE, IKURA, YUJI, INOUE, SHIGEKI
• Format: Patent
• Language: English; French; German
• Published: 11.05.2016
• Subjects: APPARATUS THEREFOR; 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; ELECTROFORMING; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

Provided is a means for further increasing corrosion resistance in comparison with conventional zirconium-based chemical conversion coating films and bismuth-based chemical conversion coating films. A metal surface treatment liquid for use in forming a composite coating film containing a Bi element and a Group 4 element on a metal base, which is a fluorine-free aqueous treatment liquid obtained by adding (A) a Bi element source, (B) a multimer of at least one Group 4 element selected from the group consisting of Zr, Ti and Hf elements, and (C) one or more aminopolycarboxylic acids or salts thereof.