도장 후 내식성이 우수한 용융 Zn계 도금 강판

• Main Author: MITSUNOBU TAKUYA
• Format: Patent
• Language: Korean
• Published: 13.05.2020
• 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

강판의 표면의 적어도 일부에 Al을 10 내지 40질량％, Si를 0.05 내지 4질량％, Mg를 0.5 내지 4질량％ 함유하고, 잔부가 Zn 및 불가피적 불순물을 포함하는 도금층을 갖고, 도금층은, 도금층 단면에 있어서 층상 Zn상과 층상 Al상이 교대로 정렬된 라멜라 조직을 면적 분율로 5％ 이상 함유하고, Fe, Mn, Ti, Sn, In, Bi, Pb, B의 어느 1종 이상을 포함하는 금속 간 화합물의 합계 존재 비율을 면적 분율로 3％ 이하로 규제하는 용융 Zn계 도금 강판. A hot-dip galvanized steel sheet includes a plated layer formed on at least a part of a surface of a steel sheet, the plated layer containing: Al in a range from 10 mass% to 40 mass%; Si in a range from 0.05 mass% to 4 mass%; Mg in a range from 0.5 mass% to 4 mass%; and the balance consisting of Zn and inevitable impurities. The plated layer has a lamellar structure in which a layered Zn phase and a layered Al phase are alternately arranged in a cross section of the plated layer, the lamellar structure accounting for 5% or more by an area fraction in the cross section, and a total abundance ratio of an intermetallic compound containing at least one of Fe, Mn, Ti, Sn, In, Bi, Pb or B is regulated to 3% or less by the area fraction.