C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
C25D 11/34 (2006.01) C23C 22/68 (2006.01) C25D 5/48 (2006.01)
Patent
CA 2343016
The invention concerns a steel plate coated with a metal layer based on zinc and a zinc hydroxysulphate layer, whereof the surface density of sulphur is more than 0.5 mg/m?2¿. The invention also concerns a method for obtaining said plate by treating a zinc coated sheet metal: either in a highly alkaline sulphate solution under polarisation: or in a sulphate solution containing Zn?2+¿ ions without polarisation. The hydroxysulphate deposit brings about a pre-lubricating effect applicable to operations for forming sheet metal.
Tôle d'acier revêtue d'une couche métallique à base de zinc et d'une couche à base d'hydroxysulfate de zinc, pour laquelle la densité surfacique de soufre est supérieure à 0,5 mg/m2. Procédé d'obtention de cette tôle par traitement d'une tôle zinguée: soit dans une solution de sulfate très alcaline sous polarisation, soit dans une solution de sulfate contenant des ions Zn2+ sans polarisation. Le dépôt d'hydroxysulfate apporte un effet prélubrifiant applicable aux opérations de mises en forme de tôle.
Bello Alain
Petitjean Jacques
Rossi Armand
Wajda Sylviane
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Sollac
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