HOT-DIPPED ZN?AL?MG-BASED PLATED STEEL

• Main Authors: MORISHITA, Atsushi, TOBA, Tetsuya, YAMAGUCHI, Shinichi, MITSUNOBU, Takuya, KOHIGASHI, Yusuke
• Format: Patent
• Language: English; French; German
• Published: 01.11.2023
• Subjects: ALLOYS; 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; FERROUS OR NON-FERROUS ALLOYS; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TREATMENT OF ALLOYS OR NON-FERROUS METALS

This hot-dip Zn-Al-Mg-based plated steel includes: a steel; and a plating layer formed on a surface of the steel, in which the plating layer contains, as an average composition, Mg: 1 to 10 mass%, Al: 4 to 22 mass%, and a remainder consisting of Zn and impurities, the plating layer includes an (Al-Zn mixed structure) in an area ratio of 10% to 70% in a cross section of the plating layer in a matrix of an (Al/Zn/MgZn2 ternary eutectic structure), the (Al-Zn mixed structure) includes a first region that has a Zn concentration in a range of 75 mass% or more and less than 85 mass% and a second region that is present inside the first region and has a Zn concentration in a range of 67 mass% or more and less than 75 mass%, and an area ratio of the second region in the (Al-Zn mixed structure) in the cross section of the plating layer is more than 0% and 40% or less.