Zinc-based coated steel sheet having execellent anti-peeling...

Details Zinc-based coated steel sheet having execellent anti-peeling... Zinc-based coated steel sheet having execellent anti-peeling...

C - Chemistry, Metallurgy

23

C

C23C 26/00 (2006.01) C23C 2/26 (2006.01) C23C 28/00 (2006.01)

Patent

CA 2464404

A zinc-based metal plated steel sheet, which has a zinc-based metal plating layer and, formed thereon, a coating film containing zinc phosphate particles in an amount of 50 wt %, and has substantially no layer formed by the reaction of the zinc phosphate particles with the zinc-based metal plating layer; and a method for producing the plated steel sheet. The zinc-based metal plated steel sheet is excellent in the resistance to flaking, and also in the sliding characteristics in an oil-free state as is seen in a portion wherein an oil film is broken off, and further in the resistance to scoring.

L'invention concerne une feuille d'acier à placage métallique à base de zinc, qui comporte une couche de placage métallique à base de zinc, et sur cette couche, un film de revêtement contenant des particules de phosphate de zinc, selon une proportion de 50 %, en poids. Il n'y a sensiblement pas de formation de couche par réaction entre les particules de phosphate de zinc et la couche de placage métallique à base de zinc. L'invention concerne également un procédé relatif à la production de la feuille d'acier considérée. Cette feuille présente d'excellentes caractéristiques de résistance à l'écaillage, de glissement dans un milieu dépourvu d'huile (par exemple, rupture dans la continuité d'une pellicule d'huile sur une partie de la feuille) et de résistance aux éraflures.

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