C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
C25D 11/30 (2006.01)
Patent
CA 2471498
The invention relates to a composition for treating magnesium alloys aimed at improving the resistance thereof to corrosion. The composition is an aqueous solution with a pH ranging between 7 and 10, containing a niobium salt, hydrofluoric acid, and optionally a zirconium salt, phosphoric acid, and boric acid. The alloy is treated in an electrochemical cell in which said alloy acts as an anode. The cell contains an inventive composition at a temperature between 20 ~C and 40 ~C as an electrolyte. An initial voltage which is sufficient to create a current density between 1.5 and 2.5 A/dm?2 ´is applied to the cell, whereupon the voltage is progressively increased to a level ranging between 240 and 330 V in order to maintain the initial current density.
L'invention concerne une composition pour le traitement d'alliages de magn~sium en vue d'am~liorer leur r~sistance ~ la corrosion. La composition est une solution aqueuse dont le pH est maintenu ~ une valeur entre 7 et 10 et qui contient unsel de niobium, de l'acide fluorhydrique, et ~ventuellement un sel de zirconium, de l'acide phosphorique et de l'acide borique. L'alliage est trait~ dans une cellule ~lectrochimique dans laquelle il fonctionne comme anode. La cellule contient comme ~lectrolyte une composition selon l'invention ~ une temp~rature entre 20~C et 40~C. On applique ~ la cellule une tension initiale suffisante pour cr~er une densit~ de courant entre 1,5 et 2,5 A/dm2~, puis on augmente la tension progressivement jusqu'~ une valeur entre 240 et 330 V pour maintenir la densit~ de courant initiale.
Ardelean Helene
Marcus Philippe
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Universite Pierre Et Marie Curie
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