Method for cleaning hot dip galvanized steel sheet and...

Details Method for cleaning hot dip galvanized steel sheet and... Method for cleaning hot dip galvanized steel sheet and...

C - Chemistry, Metallurgy

23

C

C23C 22/82 (2006.01) B05C 11/10 (2006.01) B08B 3/02 (2006.01) B08B 3/04 (2006.01)

Patent

CA 2634403

Cleaning of a hot dip galvanized steel sheet is conducted by bringing a strip-shaped steel sheet which was treated by surface oxidation in advance into contact with a cleaning liquid for 1 second or more, and then bringing the hot dip galvanized steel sheet into contact with pure water, while continuously transferring the hot dip galvanized steel sheet. The method allows efficiently and fully washing off the acidic solution adhered to the surfaces of the hot dip galvanized steel sheet treated by surface oxidation. The invention also provides an apparatus for cleaning the hot dip galvanized steel sheet to carry out the above cleaning method.

L'invention concerne un procédé de nettoyage d'une feuille d'acier zinguée au feu selon lequel une feuille d'acier zinguée au feu en forme de bande ayant été soumise à un traitement d'oxydation de surface est mise en contact avec un liquide de nettoyage pendant une ou plusieurs secondes, puis mise en contact avec de l'eau purifiée, tout en étant convoyée en permanence. Par ce procédé, une solution acide adhérant à la surface de la feuille d'acier zinguée au feu après le traitement d'oxydation de surface peut être éliminée de manière efficace et suffisante. L'invention concerne également un appareil destiné au nettoyage d'une feuille d'acier zinguée au feu, utilisé pour mettre en oevre un tel procédé.

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