Hydrogen peroxide pickling of silicon-containing electrical...

Details Hydrogen peroxide pickling of silicon-containing electrical... Hydrogen peroxide pickling of silicon-containing electrical...

C - Chemistry, Metallurgy

23

G

C23G 1/08 (2006.01) C23G 3/02 (2006.01)

Patent

CA 2443687

The pickling process of the present invention is designed for pickling electrical steel strip in a continuous fashion and comprises at least one pickling tank equipped with at least one set of sprayers designed to spray the top and bottom surfaces of a steel strip with a solution comprised of hydrogen peroxide prior to and/or after the strip is immersed in a solution contained in a pickling tank. The set(s) of sprayers in each of the pickling tanks are located above the level of the pickle bath solution, rather than being located in separate spray tanks. Upon exitin the final pickling tank, the strip is brushed/scrubbed to loosen any residual scale to form a clean strip.

Le procédé de décapage de la présente invention est conçu pour le décapage en continu de bandes d'acier électrique et il consiste à utiliser au moins un bac de décapage muni d'au moins un ensemble de pulvérisateurs conçus pour pulvériser sur les surfaces supérieure et inférieure d'une bande en acier une solution comportant du peroxyde d'hydrogène avant et/ou après l'immersion de la bande dans une solution contenue dans un bac de décapage. Le ou les ensembles de pulvérisateurs de chacun des bacs de décapage sont disposés au-dessus du niveau de la solution du bain de décapage, plutôt que situés dans des bacs de pulvérisation distincts. Lors de sa sortie du bac de décapage final, la bande est brossée/nettoyée de manière à en détacher tout résidu de calamine et à obtenir une bande propre.

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