C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 2/04 (2006.01) C23C 2/06 (2006.01) C23C 2/14 (2006.01)
Patent
CA 2596825
The invention relates to a coated steel sheet or coil having a base layer which is composed of steel and to whose at least one top face is applied, by hot dip coating, a zinc coating. In the case of such steel sheets or steel coils, the zinc coating ensures a high level of corrosion resistance. The thicker the coating, the greater this resistance. Thus, in the case of a conventionally alloyed zinc coating, in a spraying test performed on a bright, uncoated sample in accordance with DIN 50021, red rust occurs after just 24 hours in the case of a coat add-on of 25 g/m2 , whereas with a coating add-on of 70 g/m2 red rust is formed only after 120 hours. The thickness of the coating that is needed in the prior art for sufficient corrosion resistance, however, brings problems with it in connection with weldability. This is the case in particular when laser welding at high welding speeds is to be used to produce a penetration weld in the lap joint without a minimum joining gap, of the kind required in particular in the field of the construction of car bodies or in the field of household engineering. The seam produced by such welding ought to be free from through-holes, to possess substantially no craters and to have no open pores.
L'invention concerne une tôle ou une bande d'acier enduite comprenant une couche de base en acier, sur la face supérieure de laquelle au moins est appliqué un revêtement par immersion à chaud, ce revêtement étant composé d'une masse fondue contenant 0,05 à 0,30 % en poids d'aluminium et 0,2 à 2,0 % en poids de magnésium, le reste étant du zinc et des impuretés inévitables. L'épaisseur du revêtement étant au maximum de 3,5 µm et le poids de l'enduit ne dépassant pas 25 g/m2 par face, la tôle d'acier ne présente une première formation de rouille qu'au bout d'au moins 250 heures de test lorsqu'elle est soumise à l'essai de corrosion au brouillard salin selon la norme DIN 50021-SS. Cette tôle ou bande est un produit plat en acier qui allie de manière optimale une résistance à la corrosion élevée et une soudabilité optimisée et qui est particulièrement adaptée comme matériau pour la carrosserie automobile et pour la fabrication d'appareils ménagers.
Meurer Manfred
Schoenenberg Rudolf
Warnecke Wilhelm
Zeizinger Sabine
Kirby Eades Gale Baker
Thyssenkrupp Steel Ag
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