Hot dip coating employing a plug of chilled coating metal

C - Chemistry – Metallurgy – 23 – C

Patent

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Details

C23C 2/40 (2006.01) C23C 2/00 (2006.01) C23C 2/24 (2006.01)

Patent

CA 2252735

A hot dip coating system comprises a bath of molten coating metal contained in a vessel having a strip passage opening located below the top surface of the bath. A metal strip is directed along a path extending through the strip passage opening and through the bath of molten coating metal, to coat the strip. A plug composed of solidified coating metal surrounds the strip downstream of the strip passage opening and is substantially stationary relative to the moving strip. The plug prevents escape of molten coating metal from the bath through the strip passage opening while permitting the strip to move along its path. Expedients are provided to chill the coating metal downstream of the strip passage opening to form and maintain the plug and to heat that part of the molten metal coating bath which is immediately downstream of the plug.

La présente invention a pour objet une installation de revêtement métallique par immersion à chaud comportant une cuve de métal en fusion dotée d'un orifice situé sous le niveau de la surface du bain pour permettre l'introduction de la bande de métal. Une bande de métal est introduite à travers l'orifice d'entrée et acheminée à travers le bain de métal en fusion pour recevoir un revêtement métallique. Un bouchon formé par solidification partielle du métal en fusion assure l'étanchéité autour de la bande de métal au niveau de l'orifice de sortie du bain liquide. Le bouchon en question, qui est relativement stationnaire, prévient les fuites de métal en fusion à travers l'orifice de sortie du bain tout en permettant le libre passage de la bande de métal. Des expédients sont utilisés pour refroidir le métal de revêtement en aval de l'orifice de passage afin de perpétuer la formation du bouchon en question et pour chauffer la partie du bain de métal en fusion qui se trouve immédiatement en aval du bouchon.

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