SURFACE TREATMENT FILM

• Main Authors: SEKIKAWA TOSHIICHI, MATSUMURA AKI, BANDO AKIO
• Format: Patent
• Language: English
• Published: 12.10.2006
• 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 surface treatment film capable of reducing the effect on the natural environment by limiting the elution of hexavalent chromium ions from the surface treatment film to a very low concentration. SOLUTION: The surface treatment film deposited on the surface of a zinc-based metal comprises trivalent chromium oxides, supporting salt or acid as the additive element of a surface treatment liquid, and hexavalent chromium oxides in which the concentration of the hexavalent chromium film to the total weight of the film including a zinc-based metal layer is regulated to ≤ 100 ppm. COPYRIGHT: (C)2007,JPO&INPIT