용융 Al계 도금 강판의 제조방법, 및 용융 Al계 도금 강판

• Main Authors: ISHII KOUTAROU, FURUKAWA SHINYA, HATTORI YASUNORI
• Format: Patent
• Language: Korean
• Published: 02.12.2020
• 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

도금층의 표면에 미세한 스팽글이 안정적으로 형성된 용융 Al계 도금 강판의 제조방법을 제공하는 것이다. 용융 Al계 도금 강판의 제조방법은, 알루미늄을 주성분으로 하는 용융 Al계 도금욕(3)의 조성을, B를 포함하는 모합금을 첨가하여 B 농도가 0.005질량% 이상이 되도록 조정하고, 또한 K 농도가 0질량%보다 크고 0.0005질량% 미만이 되도록 조정하는 조성조정공정을 포함하며, 용융 Al계 도금욕 중에 기체를 공급하고, 욕면 부유물을 제거함으로써 용융 Al계 도금욕 중의 K 농도를 저하시킨다. Provided is a method for producing a hot-dip Al-based metal-plated steel sheet including a plated layer having a surface on which fine spangle are stably formed. A method for producing a hot-dip Al-based metal-plated steel sheet, includes a composition adjusting step of adding a B-containing master alloy so as to adjust a composition of an Al-based hot-dip plating bath (3) containing aluminum as a main component, the composition being adjusted so that the Al-based hot-dip plating bath has a B concentration of not less than 0.005 mass% and a K concentration of more than 0 mass% and less than 0.0005 mass%, the K concentration being reduced in the Al-based hot-dip plating bath by supplying gas into the Al-based hot-dip plating bath so as to remove a suspended matter on a surface of the Al-based hot-dip plating bath.