Preparation of steel surfaces for single-dip aluminium-rich...

Details Preparation of steel surfaces for single-dip aluminium-rich... Preparation of steel surfaces for single-dip aluminium-rich...

C - Chemistry, Metallurgy

23

C

C23C 2/02 (2006.01) C23C 2/30 (2006.01)

Patent

CA 2479610

A process is disclosed for the preparation of a steel surface for single-dip aluminium-rich zinc galvanising. The process steps comprise: cleaning the surface so as to obtain less than 0.6 µg/cm2 residual dirt; pickling the surface; applying a protective layer to the surface by immersion in a flux solution comprising bismuth. This invention also relates to a continuous steel product coated with a layer of metallic bismuth.

La présente invention se rapporte à un procédé de préparation d'une surface en acier pour une galvanisation au zinc riche en aluminium à trempe unique. Ce procédé consiste à nettoyer la surface de manière à obtenir moins de 0,6 µg/cm?2¿ de poussière résiduelle; à effectuer un dérochage de la surface; à appliquer une couche protectrice sur la surface par immersion dans une solution de fondant contenant du bismuth. Cette invention se rapporte également à un produit en acier continu recouvert par une couche de bismuth métallique.

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