C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 2/06 (2006.01)
Patent
CA 2505358
The present invention provides a highly corrosion--resistant plated steel sheet that can achieve excellent surface smoothness and formability and, according to the process of the present invention, a hot-dip galvanized steel product excellent in surface smoothness and formability having on the steel product surface a zinc alloy plating layer composed of 4 to 22% by mass of Al, 1 to 5% by mass of Mg, 0.000001 to 0.1% by mass of Ti, 0.000001 to 0.5% by mass of Si and the balance of Zn and unavoidable impurities, the plating layer of the plated steel product having a metal structure in which an [Mg2Si phase], an [Al phase], a [Zn2Mg phase] and a [Zn phase] are present in a mixture in the matrix of an [Al/Zn/Zn2Mg ternary eutectic structure], and the plating layer containing a Ti-Al base intermetallic compound in the [Al phase] and/or the [Zn2Mg phase] and/or the [Zn phase], is produced.
L'invention concerne un produit en acier à placage au trempé, qui comprend, outre l'acier, en surface, un revêtement d'alliage de Zn ayant la composition chimique suivante, en masse: Al, 4-22 %, Mg, 1-5 %, Ti, 0,000001-0,1 %, Si, 0,000001-0,5 %, et Zn avec impuretés inévitables pour le reste. Le revêtement a une structure dans laquelle [phase Mg2Si], [phase Al], [phase Zn2Mg] et [phase Zn] sont présentes dans un matériau de base de [structure eutectique ternaire Al/Zn/Zn2Mg] à l'état de mélange réciproque, sachant qu'un composé intermétallique Ti-Al est incorporé à la [phase Al] et/ou à la [phase Zn2Mg] et/ou à la [phase Zn]. Le produit a une résistance élevée à la corrosion, ainsi qu'un lissé et une formabilité d'excellente qualité
Hatanaka Hidetoshi
Honda Kazuhiko
Onozawa Hajime
Goudreau Gage Dubuc
Nippon Steel Corporation
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