HIGHLY CORROSION-RESISTANT PLATED STEEL SHEET HAVING EXCELLENT CORROSION RESISTANCE AND SURFACE QUALITY, AND MANUFACTURING METHOD THEREFOR

• Main Authors: KIM, Myung-Soo, KIM, Kwang-Won, HAN, Sang-Tae, SOHN, Il-Ryoung, CHO, Yong-Kyun, KIM, Sung-Joo, KIM, Tae-Chul
• Format: Patent
• Language: English; French; Korean
• Published: 22.12.2022
• 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; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; PERFORMING OPERATIONS; PUNCHING METAL; ROLLING OF METAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSPORTING

One aspect of the present invention provides a plated steel sheet and a manufacturing method therefor, the plated steel sheet comprising: a base steel sheet; a Zn-Mg-Al-based plated layer provided on at least one surface of the base steel sheet; and an Fe-Al-based inhibition layer provided between the base steel sheet and the Zn-Mg-Al-based plated layer, wherein, on the surface of the Zn-Mg-Al-based plated layer, the total area fraction of an Al single phase and MgZn2 phase is 45-60%, and the area ratio of the MgZn2 phase to the Al single phase is 1.2-3.3. Un aspect de la présente invention concerne une tôle d'acier plaquée et son procédé de fabrication, la tôle d'acier plaquée comprenant : une tôle d'acier de base; une couche plaquée à base de Zn-Mg-Al disposée sur au moins une surface de la tôle d'acier de base; et une couche d'inhibition à base de Fe-Al disposée entre la tôle d'acier de base et la couche plaquée à base de Zn-Mg-Al, la fraction de surface totale, sur la surface de la couche plaquée à base de Zn-Mg-Al, d'une phase unique d'Al et de la phase de MgZn2 étant de 45 à 60 %, et le rapport de surface de la phase de MgZn2 à la phase unique d'Al étant de 1,2 à 3,3. 본 발명의 일 측면은, 소지강판; 상기 소지강판의 적어도 일면에 구비된 Zn-Mg-Al계 도금층; 및 상기 소지강판과 상기 Zn-Mg-Al계 도금층 사이에 구비된 Fe-Al계 억제층;을 포함하고, Zn-Mg-Al계 도금층의 표면에서, Al 단상과 MgZn2상의 합계 면적율은 45~60%이고, 상기 Al 단상에 대한 상기 MgZn2상의 면적비는 1.2~3.3인, 도금 강판 및 이의 제조방법을 제공한다.