Hot-dip galvanized steel sheet having excellent press...

C - Chemistry – Metallurgy – 23 – C

Patent

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C23C 2/06 (2006.01) C23C 2/26 (2006.01)

Patent

CA 2493040

A hot-dip galvanized steel sheet includes a plating layer substantially composed of the 71 phase and an oxide layer disposed on a surface of the plating layer. The oxide layer has an average thickness of 10 nm or more and includes a Zn-based oxide layer and an Al-based oxide layer. A method for producing the hot-dip galvanized steel sheet includes a hot-dip galvanization step, a temper rolling step, and an oxidation step.

L'invention concerne une plaque d'acier galvanisée à chaud au zinc comprenant une couche de métallisation constituée sensiblement de eta phases et d'une couche d'oxyde présente à la surface de la couche de métallisation, ladite couche d'oxyde présentant une épaisseur moyenne supérieure ou égale à 10nm et comprenant une couche d'oxyde à base de Zn et une couche d'oxyde à base de Al. L'invention concerne également un procédé pour produire ladite plaque d'acier galvanisée à chaud au zinc, comprenant les étapes de galvanisation à chaud au zinc, de laminage superficiel et de traitement par oxydation.

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