Method for galvanising a steel sheet containing oxidisable...

Details Method for galvanising a steel sheet containing oxidisable... Method for galvanising a steel sheet containing oxidisable...

C - Chemistry, Metallurgy

23

C

C23C 2/02 (2006.01) C23C 2/06 (2006.01)

Patent

CA 2238831

A method wherein a steel sheet is annealed in a non-oxidising annealing atmosphere containing 0.005-1 % of ammonia, and the sheet is immersed in a galvanising bath. The method is particularly suitable for steels containing more than 0.2 % of silicon as the oxidisable alloying element. The wettability of the steel in the galvanising bath is increased while maintaining the original mechanical and/or electrical properties of the steel.

Procédé dans lequel on recuit la tôle sous une atmosphère de recuit qui est non-oxydante et contient entre 0,005 % et 1 % d'ammoniac, puis on trempe la tôle dans un bain de galvanisation. Ce procédé s'applique notamment aux aciers contenant plus de 0,2 % de silicium comme élément d'addition oxydable. On améliore la mouillabilité de l'acier dans le bain de galvanisation tout en conservant les propriétés méchaniques et/ou électriques initiales de l'acier.

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