METHOD OF PRODUCING METAL-COATED STEEL STRIP

• Main Authors: NEUFELD AARON KIFFER, TAPSELL GEOFF, RENSHAW WAYNE ANDREW
• Format: Patent
• Language: English; Korean
• Published: 24.06.2015
• 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

본 발명은 강철 스트립에 Al-Zn-Si-Mg 합금의 코팅을 형성하기 위하여 강철 스트립 상에 Al-Zn-Si-Mg 코팅을 형성하는 방법에 관한 것이다. 상기 방법은 용융된 Al-Zn-Si-Mg 합금의 욕 내로 강철 스트립을 담그는 단계, 상기 강철 스트립의 노출된 표면에 합금 코팅을 형성하는 단계, 및 냉각수로 상기 코팅된 스트립을 냉각시키는 냉각 단계를 포함한다. 상기 냉각 단계는 냉각수의 pH를 pH 5-9 범위 내에 있도록 조절하는 단계를 포함한다. 본 발명의 구체예들은 Zn: 30 내지 60 중량%, Si: 0.3 내지 3 중량%, Mg: 0.3 내지 10 중량%, 그리고 나머지: Al 및 불가피한 불순물을 포함하는 Al-Zn-Si-Mg 합금에 초점을 맞춘다. A method of forming a coating of an Al-Zn-Si-Mg alloy on a steel strip to form an Al-Zn-Mg-Si coated steel strip is disclosed. The method includes the steps of dipping steel strip into a bath of molten Al-Zn-Si-Mg alloy and forming a coating of the alloy on exposed surfaces of the steel strip and cooling the coated strip with cooling water. The cooling step includes controlling the pH of cooling water to be in a range of p H 5-9. Particular embodiments focus on Al-Zn-Si-Mg alloys that contain the following elements in % by weight: Zn: 30 to 60, Si: 0.3 to 3, Mg: 0.3 to 10, and Balance Al and unavoidable impurities.