용융 Al-Zn-Si-Mg 계 도금 강판 및 그 제조 방법, 표면 처리 강판 및 그 제조 방법, 그리고, 도장 강판 및 그 제조 방법

• Main Authors: YOSHIDA MASAHIRO, KANNO FUMITAKA, IWANO SUMIHISA, SATO YOUHEI, TAIRA SHOICHIRO
• Format: Patent
• Language: Korean
• Published: 24.06.2024
• Subjects: ADHESIVES; ALLOYS; CHEMICAL PAINT OR INK REMOVERS; 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 COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; CORRECTING FLUIDS; DIFFUSION TREATMENT OF METALLIC MATERIAL; DYES; FERROUS OR NON-FERROUS ALLOYS; FILLING PASTES; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; INKS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; POLISHES; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; THEIR PREPARATION OR CHEMICAL WORKING-UP; TREATMENT OF ALLOYS OR NON-FERROUS METALS; USE OF MATERIALS THEREFOR; WOODSTAINS

안정적으로 우수한 내식성을 갖는 용융 Al-Zn-Si-Mg 계 도금 강판을 제공한다. 상기 목적을 달성하기 위해, 본 발명은, 도금 피막을 구비하는 용융 Al-Zn-Si-Mg 계 도금 강판으로서, 상기 도금 피막은, Al : 45 ∼ 65 질량％, Si : 1.0 ∼ 4.0 질량％ 및 Mg : 1.0 ∼ 10.0 질량％ 를 함유하고, 잔부가 Zn 및 불가피적 불순물로 이루어지는 조성을 갖고, 상기 불가피적 불순물 중의 Co 함유량이, 상기 도금 피막의 총질량에 대해 0.080 질량％ 이하이고, 상기 도금 피막 중의 Si 및 Mg2Si 의 X 선 회절법에 의한 회절 강도가, 이하의 관계 (1) 을 만족하는 것을 특징으로 한다. Si (111)/Mg2Si (111) ≤ 0.8 ...(1) Si (111) : Si 의 (111) 면 (면 간격 d = 0.3135 ㎚) 의 회절 강도, Mg2Si (111) : Mg2Si 의 (111) 면 (면 간격 d = 0.3668 ㎚) 의 회절 강도 The present invention provides a hot dipped Al-Zn-Si-Mg coated steel sheet which stably has excellent corrosion resistance.　In order to achieve the above-described purpose, the present invention provides a hot dipped Al-Zn-Si-Mg coated steel sheet which has a coating film and is characterized in that: the coating film has a composition that contains 45 to 65% by mass of Al, 1.0 to 4.0% by mass of Si and 1.0 to 10.0% by mass of Mg, with the balance being made up of Zn and unavoidable impurities; the Co content in the unavoidable impurities is 0.080% by mass or less relative to the total mass of the coating film; and the diffraction intensities of Si and Mg2Si in the coating film as determined by an X-ray diffraction method satisfy the relational expression (1) below.　(1): Si (111)/Mg2Si (111) ≤ 0.8 Si (111): Diffraction intensity of (111) plane of Si (interplanar spacing d = 0.3135 nm) Mg2Si (111): Diffraction intensity of (111) plane of Mg2Si (interplanar spacing d = 0.3668 nm)