TWI787119B

• Main Authors: TOBIYAMA, YOICHI, OOI, TOSHIHIKO, FUJISAWA, HIDESHI, SHIN, OSAMU, ASHIKARI, ICHIRO
• Format: Patent
• Language: Chinese
• Published: 11.12.2022
• 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

The purpose of the present invention is to provide a hot-dip Al-Zn-based plated steel sheet that stably has excellent bending processing ability and corrosion resistance at a bending processed part, and a method for manufacturing the hot-dip Al-Zn-based plated steel sheet.　In order to achieve said purpose, the present invention is a hot-dip Al-Zn-based plated steel sheet provided with a plating film having a compositional makeup containing 45-65 mass% of Al and 1.0-3.0 mass% of Si, the remaining portion being Zn, Fe, and unavoidable impurities, and is characterized in that the plating film has dendrites formed mainly of primary Al crystals and dendrite gaps including Al-Zn eutectic crystals, the primary Al crystals each include an α-Al phase matrix and Zn precipitates, and the Zn content in the matrix is 30 mass% or less.